ASA Powerplant Mechanic Practice Test

These questions are part of the practice quiz. Start practicing

• What is the compressor pressure ratio?
• Where can you find the correct grade of fuel and amount of engine lubricating oil for an aircraft engine?
• Why are both hot and cold valve clearances given for most radial engines?
• What action should be taken to minimize risk of exhaust-related damage during ground runs?
• When magnetos are internally timed, what are you checking?
• Which of the following is a flow-indicating system type used for turbine engines?
• Which type of fire detection system operates on the principle of rate of temperature rise?
• When carburetor heat is applied, does the fuel-air mixture become richer or leaner?
• Which turbine engine installation fire-zone designation is explicitly listed?
• Where can special inspection requirements be found for a specific engine?
• Which regulations specify the inspections that must be accomplished on a general aviation aircraft?
• What can happen if a hydraulic lock is present and the crankshaft is turned?
• Where do turbine engine drains discharge fuel after shutdown?
• What precautions should be taken prior to and during ground engine operations?
• What type of instrument system is used for measuring cylinder-head temperature and exhaust gas temperature?
• Which of the following is NOT a basic type of propeller?
• Which description matches a three-phase AC tachometer's output signal?
• The data plate specifications used for trimming are obtained during calibration in which location?
• What is meant by a trip-free circuit breaker?
• What risks are associated with spilling fuel when handling a fuel control unit?
• Why does a duplex fuel nozzle usually require a dual fuel manifold?
• What are the three main parts of a typical turbosupercharger?
• What does an air-fuel mixture ratio of 12:1 represent?
• What must be done to an oil filter when it is removed from the engine?
• When must ADs be complied with?
• Which action is a Powerplant-rated mechanic permitted to perform on a propeller?
• How does a ratiometer-type oil temperature gauge measure the temperature?
• Who, or what facility, is authorized to perform major repairs to a propeller?
• In a thermocouple fire detection system, pressing the test switch causes which component to close?
• Are aircraft instruments suitable for trimming a turbine engine?
• If an ammeter is redlined at 100 percent and the regulator does not control current, how is maximum current limited?
• Which statement about transverse cracks is correct?
• What does trimming a turbine engine mean?
• What type of bearing does the floating cam ring ride on?
• Which of the following lists the four types of engine fire detection systems?
• What is the function of a drain valve in a turbine engine's combustion chamber?
• Which adjustment is used to set idle mixture on a float carburetor?
• What is the extent of the repairs a mechanic with a Powerplant rating can make to a propeller?
• In a low-tension ignition system, what component boosts voltage to the spark plug?
• What must normally be done to a nose-wheel airplane before removing an engine?
• Which factor best explains the critical nature of propeller maintenance?
• What feature prevents an APU from shutting down while it is still hot?
• When making a magneto check on an engine equipped with a constant-speed propeller, should the propeller control be in the low-pitch or high-pitch position?
• What are the four types of gas turbine engines used in aircraft?
• Why are thrust reversers not normally used when the airplane is moving below approximately 60 knots?
• Which factor describes how many wires are bundled together in a harness and influences wire sizing?
• What is the primary purpose of a pressure cowling in an air-cooled engine?
• Which statement correctly describes the primary use of synthetic oil?
• What is the purpose of a cold cylinder check?
• What would likely cause a false fire alarm in a thermistor-type continuous-loop system?
• What is the purpose of the restricted orifice in the line between the oil pressure gauge and the engine?
• What risks are associated with ground operations when not following the manufacturer's instructions?
• What is the primary function of a reciprocating engine exhaust system?
• Who is allowed to reduce the diameter of a type certificated propeller?
• How is ice prevented from forming on the nose cowl, nose dome, and inlet guide vanes of a turbine engine?
• What are maintenance-related FOD risks and how can they be prevented?
• Which feature of a spark plug design helps purge lead-containing gases from the plug?
• Which clearance is used for valve timing purposes on cylinder number one?
• What is the normal starting sequence for a turbine engine?
• What controls generator output voltage?
• Which component must be backed off to allow the propeller to be pulled off the shaft?
• Before starting a turbine engine, which of the following should be checked?
• How is exhaust flow different in a ducted fan turbine engine versus an unducted fan engine?
• Which statement about lubricants and manufacturer recommendations is true?
• Which statement describes the function of the APU during hot shutdown protection?
• Why are protective covers placed over some switches in an aircraft electrical circuit?
• What are the three basic valve types used in aircraft fuel systems?
• In what units is an electronic motorless mass flow meter system calibrated?
• The percentage of time the wire bundle will be loaded is used to determine what?
• What defines a load as intermittent rather than continuous in terms of duration?
• Which action is performed first in the normal turbine engine starting sequence?
• Which is listed as an advantage of a horizontally opposed engine?
• How many diodes are required to convert three-phase AC to DC?
• What is a major risk during ground operation of aircraft engines?
• Why is it important to maintain proper polarity on components or systems when performing maintenance on electrical systems?
• A starter motor is typically wound in which configuration to achieve maximum torque at stall?
• What is the purpose of the lay line on a flexible fuel hose?
• What does the red arc on the tachometer indicate?
• Which load condition is considered when determining wire size?
• Which statement correctly pairs a turbine section with its function?
• What can be done to prevent the front cone from bottoming when installing a propeller on a splined shaft?
• In spectrometric oil analysis, copper in the oil indicates wear of which component?
• What must be followed at all times during propeller maintenance?
• What precaution should be taken before working on exhaust systems because the components are extremely hot during operation and heat-soaked after shutdown?
• How are the high internal temperatures of a turbine engine cooled and kept under control?
• During an engine fire that is outside of the engine, what is the recommended action?
• In flight, what enables a feathering propeller to move to the feather position when oil pressure is removed?
• Where does the lubricating oil for an air-turbine starter come from?
• If wiring cannot maintain six inches away from fuel lines, what minimum separation must be observed?
• Why should spark plugs be kept in numbered holes in a tray after removal?
• What is the role of inlet air around the combustion chamber in a turbine engine?
• Which component is designed to break and disconnect the starter from the engine if the engine drives the starter beyond its design speed?
• What risks are associated with inadvertent damage to an instrument or indicating system during maintenance?
• What could cause a fuel pressure gauge to fluctuate?
• In what position should the ignition switch be placed when using a timing light on the magnetos?
• Preservation for temporary storage is valid for engines out of service for how many days?
• What are the risks associated with incorrect retard points or an impulse coupling lag angle different from the manufacturer specification?
• Where can the requirements be found for inspection and checking of engine mounts and mounting hardware?
• In a four-stroke engine, which stroke is the intake stroke?
• Which best describes a starter-generator?
• What are the basic principles of a hydromechanical fuel control?
• Why do aircraft fuel metering systems for reciprocating engines have mixture controls?
• In the indicated horsepower formula, what does N represent?
• Which adjustment sets idle RPM on a float carburetor?
• What is an all-weather spark plug?
• How are electrical wires protected where they pass through high-temperature areas?
• What is the primary reason to route wiring through conduit in areas where damage could occur?
• Which instrument is typically used to indicate engine oil pressure?
• Which statement best summarizes why propeller maintenance is essential?
• What would likely cause the pointer of a magnetic drag tachometer to oscillate?
• What procedure should be followed if a reciprocating engine fire is started by backfiring and affects the induction system?
• Propeller maintenance aims to prevent failure of what component?
• In the Teledyne Continental (TCM) fuel injection system, which component controls fuel for low-speed operation?
• Which component provides automatic speed regulation in a constant-speed propeller?
• What practice helps prevent hardware, tools, or safety wire from remaining in the engine inlet area?
• What is the maintenance classification for shortening a propeller blade?
• What is synthetic oil?
• What happens in a magneto ignition system when the ignition switch is placed in the Off position?
• Where does a dry sump oil system store oil?
• What type of propeller relies on a manual oil valve to control pitch?
• Where can you locate the CFR that governs maintenance recordkeeping?
• What is the primary hazard when performing a compression check with the cylinder under test?
• What is a jet aircraft hush kit?
• Primary purpose of bleeding air off the compressor section?
• What best describes a low-tension ignition system?
• In installing thermocouple leads for a cylinder-head temperature indicator, which is critical—the length or the resistance?
• What document describes the proper use of cowl flaps on an air-cooled engine?
• What is the role of the JetCal analyzer in turbine engine maintenance?
• What should a manifold pressure gauge read when the engine is not operating?
• Which engine type is commonly used in commercial aviation due to lower noise and better fuel consumption?
• How are the four strokes of a reciprocating engine analogous to turbine engine sections?
• Which statement correctly distinguishes turbochargers from traditional superchargers?
• During internal timing of a magneto, which conditions must be satisfied?
• What is the function of the expansion chamber in a muffler?
• What is the primary design concern of a turbine engine inlet?
• What do the colors red, green, and yellow indicate on aircraft gauges?
• Which statement best describes the hazards associated with extinguishing agents?
• What paperwork is necessary for the installation of a magneto that was not approved for an engine when certificated, but is approved for the engine when installed according to an STC?
• How is a turbine engine cooled?
• Where are most APUs located in modern jet transport aircraft?
• Why is a propeller indexed to the engine crankshaft?
• When working around capacitor discharge ignition systems, what safety precaution is essential?
• What would be the effect on engine operation of an air leak in the intake pipe for one cylinder?
• Short stack exhaust systems are generally used on which engines?
• Why should an air-cooled engine not be run up to high power without the cowling installed?
• What is meant by a hot-section inspection?
• Which statement describes jet blast hazards associated with turbine engine operation?
• What controls the blade angle of a propeller when operating in the beta range?
• Failure to follow maintenance manual procedures can lead to what type of damage?
• What happens in a jet transport airplane when the fire-pull T-handle for an engine is pulled?
• What is the purpose of a chip detector?
• During magneto timing, what is the purpose of aligning the distributor rotor to cylinder number one at the E-gap instant?
• Why do some aircraft filters have a relief valve?
• What is the purpose of an augmentor on a reciprocating engine exhaust system?
• What is the best practice when adding oil to an engine?
• Which statement correctly describes how dye penetrant inspection works?
• What is the purpose and operation of an impulse coupling?
• What is the function of the capacitor in a magneto ignition system?
• What is the normal starting sequence for the turbine engine fuel system?
• What is done to cause a McCauley propeller to feather?
• Grounding the magneto primary circuit serves to:
• Is it permissible to cold straighten a damaged aluminum alloy propeller blade to facilitate shipping it to a repair station?
• Where does an air-turbine starter get air for starting on a jet transport aircraft?
• Which action best reduces the risk of fire when wires are routed near fuel lines?
• When inspecting exhaust systems, why might internal portions require attention?
• In what position is the magnet in a magneto when the greatest change in flux density in the coil core takes place?
• How does an augmentor system increase cooling airflow over a reciprocating engine?
• What type of damage is most common in the exhaust system of a reciprocating engine?
• What are the two categories of engine-driven fuel pumps?
• What are the three most common types of fuel filters?
• What is FADEC in a gas turbine engine?
• What does a fuel-injected engine have that prevents the loss of induction air if the air inlet filter should become covered with ice?
• What makes maintenance and inspection of a spinning propeller particularly critical?
• Does centrifugal twisting moment on a propeller blade tend to move the blades toward high pitch or toward low pitch?
• What is the minimum separation between a wire bundle and a fluid line carrying combustible fluid or oxygen, when possible?
• Why is valve clearance adjusted on radial engines, but not on most horizontally opposed engines?
• What two instruments show the condition of a reciprocating-engine lubrication system?
• Why is the engine pressure ratio indicator used during takeoff thrust checks?
• What are the advantages of a solid-state magneto?
• In an externally driven turbocharger, does the compressor act before or after mixing with metered fuel?
• Using a timing light with magnetos primarily helps verify which aspect of timing?
• What precaution must be taken when checking the electrical circuit for igniting the powder charge in the valve of a high-rate discharge bottle?
• What is the first action to take if an engine fire occurs during the starting cycle?
• What is ECAM in aviation systems and what does it do?
• Why is it not necessary to flash the field of a DC alternator after it has been overhauled?
• What defines a cold-tank lubrication system for a turbojet engine?
• Why do some air-cooled engine installations have cowl flaps?
• In propeller synchronization, what is a slave engine?
• Which sequence describes the basic steps for removing a typical propeller?
• Describe how twin-engine propellers are synchronized.
• How does a reciprocating engine muffler decrease engine noise?
• What maintenance is allowed on a continuous-loop fire detection system?
• How can bypass of turbine engine strainer be identified?
• Does a turbine engine controlled by a FADEC require manual trimming?
• Which checks are included to evaluate ignition systems for a reciprocating engine installation?
• In ATA-100 maintenance documentation, where would you find instructions for inspecting and servicing an airborne APU engine?
• Who is authorized to repair a fuel flow indicating system?
• What prevents too high an air pressure from overspeeding an air-turbine starter?
• What is used to fill the line between a fuel pressure gauge and the fuel metering system?
• What is the purpose of the drain valves located in an engine's combustion chambers and intake manifolds?
• What is a key measure to decrease the risk of damage due to foreign object damage (FOD)?
• What should a ratiometer temperature indicator read when the electrical power is off?
• What happens if oil is not changed at the recommended intervals?
• What is the difference between a controllable propeller and a constant-speed propeller?
• What two considerations must be evaluated when selecting wire size for an aircraft installation?
• What safety precaution should maintenance personnel follow when moving a propeller by hand?
• If the fuel flow for all conditions is high, what might this indicate?
• What are the three basic valve types used in aircraft fuel systems?
• What is a key advantage of fine-wire spark plugs over massive-electrode spark plugs?
• A QEC engine assembly is designed to minimize downtime by being what?
• Which components are included in the hot section of a turbine engine?
• What damage to an aluminum alloy propeller blade can be repaired by a Powerplant-rated mechanic?
• What type of oil quantity indicator is used in most aircraft engines?
• Which parameters are sensed by a hydromechanical fuel control?
• What are the risks associated with not understanding the meaning of warning or caution lights on an annunciator panel?
• Which condition is a direct risk if a propeller is damaged and not properly maintained?
• Where can you find the maximum amount of cylinder fin area that can be removed to clean a damaged area?
• Why should you use plugs or caps rather than tape to cover ends of disconnected lines?
• What is meant by rigging the engine controls so they have some 'cushion'?
• In a turbine engine with a starter-generator, which action occurs when the start switch is moved to START?
• What describes the E-gap position in a magneto?
• What safety practices should ground personnel observe around operating turbine engines?
• Which of the following is NOT a function of the oil in an aircraft engine?
• What is the firing order for an 18-cylinder radial engine if you start with cylinder 1 and add 11 or subtract 7 to stay between 1 and 18?
• What kind of fuel boost pumps are normally installed inside the fuel tanks?
• Which of the following is NOT a listed cause of high oil consumption?
• Which engine instruments are monitored during the start of a turbine engine?
• What is a direct outcome of FADEC scheduling fuel to the nozzles?
• How is most of the troubleshooting for a modern APU performed?
• What are the basic types of propellers?
• When must FAA-approved data be used for an engine repair or modification?
• What are two ways of pre-oiling an engine?
• What is the purpose of insulation blankets in a turbine engine installation?
• A QEC engine assembly includes which connections to be ready for operation?
• For determining the maximum permissible removal of damaged cylinder fin area, which document should be consulted?
• Which two types of fuel heaters are used in a jet transport aircraft?
• Which statement about pressure-type carburetors is true?
• Which circuit delivers the spark to the spark plug in a magneto system?
• What does an APU provide when the main engines are not operating?
• What is meant by pressure cooling of an air-cooled engine?
• Propeller maintenance procedures should be followed to prevent what?
• How does knowing the cylinder from which a spark plug came help during maintenance?
• Which statement is true regarding the reciprocating engine strokes and turbine sections?
• Which statement about Engine Pressure Ratio (EPR) usage is true?
• How is oil pressure regulated in an aircraft engine?
• How does the torquemeter generate torque readings?
• During a cold cylinder check, how is the cylinder that is not firing identified?
• Two main causes of low compression are which?
• What alignment method is used to align a propeller to the engine to reduce operating vibrations?
• Why is a series of oil samples required in spectrometric analysis?
• What is the recommended practice when working on energized aircraft circuits in large aircraft where personnel may not be visible from the flight deck?
• What are two types of electronic fuel controls for turbine engines?
• Which statement about cold straightening of aluminum propeller blades is correct?
• Which statement correctly describes hot and cold spark plugs?
• What adjustment can a mechanic with a Powerplant rating make to a propeller governor?
• Which statement best describes high-voltage turbine ignition systems compared with low-voltage systems?
• For trimming, from where is the trimming data plate specification derived?
• When trimming, where should ambient temperature be measured?
• The mass of the flow is affected by what property of the fuel?
• What is meant by on-condition maintenance of a turbine engine?
• What specifications are used to trim a turbine engine?
• Where can a mechanic find inspection, checking, and servicing requirements for a specific engine component?
• What is the main advantage of a magneto ignition system over a battery ignition system for an aircraft reciprocating engine?
• Which energy source powers a turbocharger rather than a mechanically driven supercharger?
• Why must the reference junction in a thermocouple fire detection system be thermally insulated?
• What is meant by a QEC engine assembly?
• Is automotive oil suitable for use in aircraft engines?
• Risks of using engine lubricants other than those specified by the manufacturer?
• What is a floating cam ring on a large radial engine?
• What is the effect of insulation blankets on engine performance?
• What is used as the rectifier to produce direct current in a DC generator?
• What defines straight mineral oil used in aircraft lubrication?
• What are the risks associated with extinguishing agents used in aircraft systems?
• Which of the following is NOT a factor to consider when determining wire size?
• What is the danger of mixing engine oils?
• Engine mounts maintenance requirements are typically found in which manual?
• What are the two types of fuel injection systems used on modern reciprocating aircraft engines?
• What dangers are present when operating a propeller on the ground?
• Preflight lubrication checks include which item?
• What is the main functional advantage of a duplex fuel nozzle?
• Is a mandatory service bulletin required to be complied with?
• What type of ignition system is used on most turbine engines?
• What is a key safety requirement when performing ground checks on thrust reversers?
• FADEC furnishes information to which system?
• Which type of starting system is commonly used on smaller turbine engines?
• If a component is manufactured by the engine maker, where are its inspection requirements located?
• Secondary purpose or use of bleed air?
• Why is bleed air commonly taken from the final or highest pressure stage of the compressor?
• What considerations or precautions should be taken when performing maintenance on fuel systems?
• In a constant-speed propeller, what component directly moves the pilot valve when the prop control is adjusted?
• Why is stranded wire used in most powerplant electrical systems instead of solid wire?
• How is ice removed from propeller blades?
• Why is it important to parallel the outputs of a dual-generator system?
• In the context of APU operation, which component monitors load and regulates fuel to prevent exceeding safe limits?
• What problem can improper piston ring conditioning lead to?
• In an aircraft fuel system, where is the main strainer typically located?
• Which of the following statements about turbine engine fire zones is correct?
• Which statement best describes ashless dispersant (AD) oil?
• What kind of indicator mechanism is used to measure oil pressure?
• What is used as a fire extinguishing agent in some older aircraft?
• Why is it important to keep induction air filters clean and replace them as recommended by the manufacturer?
• If an exhaust leak is in a cabin heat exchange area, what hazard can occur?
• What equipment is used to determine that a turbine engine meets manufacturer performance standards (EGT, EPR, etc.)?
• What does 14 CFR Part 43, Appendix D specify in practice?
• Which system does FADEC interact with for engine status alerts?
• In a ducted fan turbine engine, how are the fan airflow and core airflow discharged?
• Ambient temperature of the area where the wire will be installed is a factor in determining wire size because it affects what?
• What is the initial step when removing a typical propeller?
• Which statement about multiviscosity oils is true?
• What is the function of a float carburetor?
• How are small nicks removed from the leading edge?
• If there is a break in a single-wire continuous-loop fire detector element, and the system tests bad, will it indicate the presence of a fire?
• Which checks should be made to determine the proper operation of a reciprocating engine installation?
• Which statement best describes the risks associated with operating a turbine engine?
• When should the engine oil quantity be checked on a turbine engine?
• In a turbofan engine, how is cooling primarily achieved?
• Under what condition does EICAS automatically display parameters outside the allowable range?
• In what position is the magnet in a magneto when the breaker points begin to open?
• How is hydraulic lock removed?
• In a turbine engine with a starter-generator, placing the start switch in START position causes which of the following actions?
• What must be inspected on the cooling system of an air-cooled engine?
• How is turbine engine preserved for long inactivity?
• Which of the following is a designated engine fire zone?
• Which sensor is used in cylinder-head temperature indicators?
• Which configuration is ideal for installation on aircraft wings?
• Are internally driven superchargers located before or after the carburetor?
• What is the purpose of engine baffles and seals in a pressure cowling system?
• What is the primary purpose of cowling on an air-cooled engine?
• What is meant by the beta range of operation of a turboprop propeller?
• What is an IDG (integrated drive unit)?
• Which device uses exhaust gas velocity to drive a turbine that powers an impeller to compress intake air?
• In a low-tension ignition system, what is the role of the brush-type distributor?
• What is the purpose of the felt-tip pen during propeller removal?
• What cautions should be used when handling, storing, and disposing of used lubricating oils?
• During propeller removal, what is used to mark alignment between the propeller hub and the engine flange?
• How is heat removed from the liquid in a liquid-cooled engine?
• What is the purpose of an air-oil separator, or deaerator, in a turbine engine oil tank?
• How are fuel lines often protected in an engine compartment?
• What is the function of the snap ring inside the hub of a propeller that is mounted on a tapered or splined shaft?
• Which statement about impulse coupling timing during starting is correct?
• What risks are associated with routing wiring near flammable fluid lines?
• How can you determine that a surface scratch in an aluminum alloy propeller blade is not actually a crack?
• Where do you find a list of the lubricants that are approved for use in a constant-speed propeller?
• What engine fault could cause high EGT, low RPM, and high fuel flow at all engine pressure ratio settings?
• What device warns of metal chips or particles in the air-turbine starter oil?
• Why is a fuel-injected reciprocating engine less prone to icing than a float carburetor engine?
• Which item is included in turbine engine preflight verification checks?
• What is described as extremely high on a spinning propeller?
• What condition in the compressor inlet can lead to compressor stall?
• Which of the following best describes the risk associated with a spinning propeller?
• What is the purpose of a generator CSD (constant speed drive) unit?
• In annunciator indicating systems, what do the colors green, yellow, and red represent?
• What are the dangers of instrument error due to failures or out-of-calibration conditions?
• What is done to cause a hydromatic propeller to feather?
• What is meant by trimming a turbine engine?
• What anti-icing system is used to prevent ice from forming on propeller blades, and how is it delivered?
• What is a mechanical-blockage thrust reverser?
• Where can you find the electrical power requirements for a fuel flow indicating system?
• What instrument is used to measure the blade angle of a propeller?
• Why is the maximum altitude the wire will see a factor in wire sizing?
• What rule is used to determine firing order for an 18-cylinder radial engine?
• What is a spectrometric oil analysis program?
• If there is a break in a single-wire continuous-loop fire detector element, and the system tests bad, will it indicate the presence of a fire?
• What keeps a McCauley feathering propeller from feathering when the engine is shut down on the ground?
• During maintenance, what action is required if metal is found on a chip detector?
• Why are fuel lines protected with a fire protection sleeve?
• Is an APU compartment considered a fire zone?
• During maintenance on an operating turbine engine, which statement correctly identifies hazards for different engine types?
• In a hydromechanical fuel control, how is fuel metered to the engine?
• Where are the pressure pickups located for Engine Pressure Ratio (EPR) measurement?
• Which documents are FAA-approved data for airworthiness decisions?
• What is the recommended method when making maintenance adjustments on an operating engine?
• How many igniters are used with most turbine engines?
• What is a recommended practice to safely perform exhaust system inspection given potential hidden internal damage?
• Which Halon agents are used in high-rate discharge bottles in jet transports?
• Which of the following is a listed cause of high oil consumption?
• Which method is appropriate for cleaning up a fuel spill that has contaminated a tire?
• What controls the amount of air cooling in a pressure cowling system?
• What should be used to cover the ends of fuel and oil lines that have been disconnected from the engine?
• How is the strength of the magnet in a magneto checked?
• Which distance specification is used for blade-angle measurement?
• What is adjusted inside the governor for a constant-speed propeller to change the speed at which the propeller is operating?
• Where are instructions for removing an engine from an aircraft found?
• What materials are propeller blades made from?
• What lifter type do radial engines typically have?
• What must be done with the mounting nuts and studs during propeller removal?
• How is a turbosupercharger (or turbocharger) driven?
• Which document specifies the distance for blade-angle measurement?
• Where can the scope and details of the engine items to inspect during an annual or 100-hour inspection be found?
• What cautions should be taken when performing maintenance on energized aircraft circuits and systems?
• What is a Supplemental Type Certificate?
• What happens to engine RPM when carburetor heat is applied?
• What is used as the rectifier to produce direct current in a DC alternator?
• In flight, which statement best describes feathering behavior when oil pressure is removed from a McCauley propeller?
• FADEC includes the Electronic Engine Control (EEC) and functions with the flight management computer.
• Which document would you consult to follow safety procedures when replacing an igniter plug in an APU engine?
• How is a pneumatic-type continuous-loop fire detection system checked for operation?
• What is a primary maintenance advantage of solid-state magnetos?
• Who is responsible for maintaining an aircraft in an airworthy condition?
• Before starting an engine, what should you inspect for objects and debris?
• What does the pilot do to change the RPM of an engine equipped with a constant-speed propeller when it is operating within the constant-speed range?
• Why do some aircraft engines have a critical range of operation?
• What is specific fuel consumption (SFC)?
• What condition would cause hesitation when the throttle is rapidly advanced from idle to full power in an engine using a float carburetor?
• What is the danger of an internal failure of baffles and diffusers in an exhaust muffler?
• Which statement describes how a mechanical-blockage thrust reverser differs from a cascade-type thrust reverser?
• What is used to protect a wire bundle from chafing where it passes through a bulkhead or frame hole?
• When should aircraft wiring be installed in a conduit?
• Where can you find the model of magneto approved for a given engine?
• Which statement about ashless dispersant (AD) oil is true?
• How is fuel ignited in a diesel cycle engine?
• Which arrangement is typical for converting three-phase AC to DC with diodes?
• How can you verify that the electrically heated deicer boots on the propeller blades are functioning as they should?
• What are the two main types of turbine compressors?
• During installation on a splined shaft, what might happen if no spacer is used behind the rear cone?
• In a pressure cooling system, after the air passes over the fins, where does it flow?
• Which malfunction would cause an aircraft reciprocating engine to continue to run after the ignition switch is placed in Off?
• What does an engine pressure ratio (EPR) indicator measure?
• What should a thermocouple cylinder-head temperature indicator read when the engine is cold?
• How do you test operation of a thermocouple fire detection system?
• Which group of items must be inspected to determine the airworthiness of an engine installation?
• Where would you find the ignition plug safety procedures for an APU engine?
• What is meant by a multiviscosity oil?
• Which statement correctly describes the role of a starter-generator during engine operation?
• What is indicated if the red discharge indicator for a fire extinguishing system is blown out?
• What is the function of baffles in directing airflow within a turbine engine?
• In the Precision Airmotive fuel injection system, what component responds to the mass of air entering the engine to regulate fuel?
• Which components must be inspected on a 100-hour or annual inspection for a reciprocating-engine lubrication system?
• Why is it important to use a torque wrench when installing spark plugs in an aircraft engine?
• What is a key precaution when disconnecting or connecting a squib during maintenance?
• In a duplex nozzle, what component is used to divide and pressurize primary and secondary fuel flow?
• What is meant by the alpha range of operation of a turboprop propeller?
• With which type of turbine-engine ignition system is a glow plug igniter used?
• What is the purpose of a FADEC system in a gas turbine engine?
• Where can you find the grade of engine oil specified for a particular aircraft?
• What characterizes a shower of sparks ignition system?
• What is the primary rigging process for a turbine engine?
• On-condition maintenance relies on operating parameters specified by whom?
• What should be done to the cylinders to protect them from rust and corrosion when preparing the engine for long-time storage?
• What is a major hazard of operating reciprocating engines with exhaust leaks?
• What are the two broad categories of ignition systems used in turbine engines?
• In a pneumatic-type continuous-loop fire detection system, what activates the alarm switch during a test?
• When the fire is on the ground under the engine overboard drain, where should CO2 be discharged?
• In a cascade-type thrust reverser, which component moves to expose the cascades?
• When should the brushes in a starter motor be replaced?
• How many phases of AC electricity are produced by a typical aircraft alternator?
• Indications of an engine bleed-air valve malfunction?
• What is a characteristic of straight mineral oil?
• To reverse the direction of rotation of a DC motor, you should...
• Besides the main strainer located at the lowest point, where else is a fuel strainer found in some aircraft fuel systems?
• What are the four strokes of a four-stroke reciprocating engine?
• Why is it important to preserve engines that will not be operated for an extended period?
• What are the dangers associated with handling and storage of discharge cartridges (squibs)?
• In normal operation, what does EICAS continuously display?
• Where is bleed air taken from on a turbine engine?
• If engine baffles and seals were missing, what would be the most likely effect on cooling?
• What kind of electrical instrument system is used for measuring oil temperature?
• What must be done to a DC generator's field before it can produce current after overhaul?
• Which statement describes why magnetos are preferred in aircraft engines?
• Do the counterweights on a propeller tend to move the blades toward high pitch or toward low pitch?
• During starting of a turbocharged engine, should the waste gate be open or closed?
• What component's compression changes when the propeller control is moved, causing the pilot valve to actuate?
• Which hazard is practically eliminated by the pressure-type carburetor's nozzle location?
• What happens when the cowl flaps are opened on a pressure cooling system?
• Which resource should be used to ensure ground engine procedures are correct?
• What can small damage to a propeller lead to if not addressed?
• Are the instruments installed in an aircraft suitable for trimming a turbine engine?
• Under the 80 percent continuous-load practice, what is the implied safety margin for continuously loaded electrical systems?
• When adjusting valves on an engine with a floating cam ring, what must be done to the valve spring pressure?
• Which data sheet specifies which propellers may be installed on the aircraft?
• When should a turbine engine be retrimmed?
• Which instrument uses resistance change in the oil-temperature bulb to display temperature?
• What should be followed at all times to ensure propeller integrity?
• During magneto timing, the piston in cylinder 1 should be in which position for ignition to occur?
• What dangers are present when handling fuel metering system components results in fuel spillage on the hangar floor?
• During maintenance of a continuous-loop fire detection system, which components are typically inspected and possibly replaced?
• If maintenance procedures are not followed, what is a potential outcome?
• Locating the main strainer at the lowest point helps with maintenance by what?
• What cautions are to be taken when servicing a liquid cooling system?
• Where does a wet sump oil system store oil?
• In a pressure-type carburetor, where is the discharge nozzle located relative to the throttle valve?
• What is the danger of working around reciprocating engines with an ungrounded magneto?
• What are some uses of bleed air?
• Which way should the toggle of a switch that controls the propeller pitch move to place the propeller in low pitch (high RPM)?
• What is measured to indicate the engine RPM with a three-phase AC electric tachometer?
• Where can an aircraft mechanic find the recordkeeping requirements for maintenance operations?
• How does a leak appear in an engine exhaust system?
• Which statement about ashless dispersant oil is true?
• Which task is NOT included in the checks a Powerplant-rated mechanic is allowed to perform on a propeller?
• In spectrometric oil analysis, aluminum in the oil indicates wear of which components?
• Before starting an engine, what area considerations are important to prevent damage from debris?
• Which of the following is a function of the boost pump in the tank of a jet transport aircraft?
• After engine shutdown, what checks are performed?
• In RUN position, which statement describes the generator's behavior?
• Which item is not typically checked during engine runup?
• Which statement about common fuel filter types is true?
• If the starter relay chatters rather than locks in when the start switch is in START position, what does this indicate?
• What is the primary purpose of trimming a turbine engine?
• Which elements are involved in FADEC and its interaction with other systems?
• What problems can occur if the air-fuel control unit on a reciprocating engine is not adjusted correctly?
• Which indicator mechanism is used to measure manifold pressure?
• What is the primary function of the generator circuit breaker in a turbine engine starter-generator system?
• For takeoff, should an adjustable-pitch propeller be in high or low pitch?
• How can you check a reciprocating engine exhaust system for leaks?
• Where in the fuel system is the fuel flow transmitter located?
• What is a likely consequence of ignoring small propeller damage?
• What cautions should be taken when performing a compression check on a reciprocating engine?
• Why should CO2 not be discharged directly into the engine exhaust?
• A thermocouple cylinder-head temperature indicator requires leads with specific resistance typically 2 or 8 ohms.
• Which are three types of flow-indicating systems used for turbine engines?
• A compensated fuel pump maintains fuel pressure relative to ambient air pressure by what mechanism?
• When wiring must pass through a wheel well, how should it be protected?
• May transverse cracks in a metal propeller blade be repaired?
• How does a cascade-type thrust reverser operate?
• What risks are associated with exhaust systems during ground operation of aircraft engines?
• Which of the following are FAA-approved data: service letters, service bulletins, instructions for continued airworthiness, ADs, or TCDSs?
• Which instrument uses a thermocouple system to measure temperature?
• What are baffles used for in the air flow of a turbine engine?
• Which of the following is a valid use of bleed air?
• What is a FADEC?
• What is EICAS (Engine Indicating and Crew Alerting System)?
• What type of fitting is used to connect an oil pressure gauge to the engine?
• What kind of indicating system is used to measure oil temperature in a small, single-engine GA airplane?
• How do the components in the exhaust system of a turbocharged engine allow expansion and contraction due to heat, while preventing leakage?
• What creates the pressure of the air in a pressure cowling?
• Which component is typically closed or tripped when the fire-pull T-handle is activated on a jet engine?
• Where are fuel drains located in an aircraft engine?
• What are the two basic types of fuel nozzles?
• Where is the propeller protractor placed to measure the propeller blade angle?
• What do mass flow systems measure?
• What is a short stack exhaust system?
• Which aircraft electrical circuit does not normally contain a fuse or circuit breaker?
• Why is it important to follow proper maintenance procedures on a turbocharger?
• Why is it important to follow manufacturer's instructions when maintaining compressor bleed air systems?
• Why do engine manufacturers recommend oil changes at specific intervals?
• How is a supercharger driven?
• What precautions should be taken when working on fire extinguisher discharge cartridges (squibs)?
• Why are air-turbine starters preferred over electric starters for large turbine engines?
• How is the temperature read in the sealed oil-temperature indicating system?
• Where should ambient temperature be measured when trimming a turbine engine?
• Which statement best describes the function of impulse coupling in a magneto system?
• What risks are associated with incorrect adjustments of a turbine engine fuel control unit (FCU)?
• After overhaul, what must be done to a DC generator before it can produce electricity?
• What practical rule protects the battery and electrical system when placards or monitoring devices are not used?
• Where is oil temperature measured on a reciprocating engine?
• What is the primary function of an APU?
• What is the formula for calculating indicated horsepower on a 4-stroke engine?
• What prevents the APU from exceeding its safe operating limits when the bleed air valve is fully open?
• Which statement is true about engine-driven fuel pumps according to the material?
• Which of the following describes how a squib is fired?
• What color and marking identifies the fluid lines that carry the fire extinguishing agent in an aircraft?
• Where can a list of life-limited parts be found for a specific engine?
• What is the function of the accumulator used with some McCauley feathering propellers?
• What fire extinguishing agent is used in the high-rate discharge bottles installed in a jet transport aircraft?
• What does FADEC do to prevent overshooting power changes and over-temperature conditions?
• What kind of tachometer is used on most small single-engine airplanes?
• What describes hydraulic lock in an aircraft engine?
• From which compressor stage is bleed air most often taken, and what condition exists there?
• If the fire persists, what action is allowed with CO2 installation?
• What is meant by the reach of a spark plug?
• What is indicated if the yellow discharge indicator for a fire extinguishing system is blown out?
• Which description correctly identifies a dry sump lubrication system?
• Why does ice form in the throat of a float carburetor?
• Which statement is true about rectification in a DC generator?
• What defines a hot-tank lubrication system for a turbojet engine?
• What defines the E-gap in magneto timing?
• Why is it important for turbine engines to have a relatively distortion-free flow of air to the inlet of the compressor?
• When determining maximum continuous electrical load, what defines a load as intermittent?
• What are the three distinct circuits in a magneto system?
• When paralleling the outputs of two generators, how close must the output voltages be?
• When the start switch is placed in RUN position for a turbine engine with a starter-generator, which statement is true?
• What is the range of pressure normally used for a fuel pressure gauge with a float carburetor?
• Which practice should always be followed to ensure propeller safety?
• Where can examples of acceptable repairs to aluminum alloy propeller blades be found?
• Why should carburetor heat be limited when operating an engine on the ground?
• What is the purpose of the shear section in an air-turbine drive shaft?
• When the breaker points open in a magneto, what occurs?
• What does a torquemeter measure?
• Where is the fuel flow transmitter located in the fuel system?
• Which factor directly influences voltage drop in a wire run?
• In a diesel cycle engine, ignition is achieved by which mechanism?
• How is a high-rate discharge bottle of fire extinguishing agent discharged?