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287 Cards in this Set

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what procedure should be followed when valve blow by is indicated by a hissing sound on a reciprocating engine?
perform a cylinder compression test to identify the faulty chamber.
what is the running valve clearance on engines with hydraulic valve lifters?
zero
what type of check can be made to locate a cold cylinder in a two row radial engine?
a cold cylinder check.
what factors about the condition of an engine can be learned by studying the results of a compression check?
It determines valves, piston rings and pistons adequately sealing.
what should be done to repair a loose stud in an engine crankcase?
remove the loose stud and check the hole for size and condition of the threads. it may be necessary to retap and use an oversize stud.
How is a cylinder barrel check for being out of round?
a dial indicator can be used to measure the top of the cylinder and also the skirt. two reading should be taken at 90 degrees to each other.
what types of connecting rods are commonly found in radial engines?
a master rod and an articulated rod assembly.
what are the different types of piston rings?
compression, oil control and oil scraper.
what is the purpose of oil control rings?
to regulate the thickness of the oil film of the cylinder wall.
what types of bearings are in general use in a reciprocating engine?
plain, roller and ball.
Where are cracks most likely to be found in a piston.
in highly stressed areas such as the base of the pin bosses, inside at the junction of the head and walls and ring lands.
what are the different types of reciprocating engines?
in line, opposed v type and radial
what is the purpose of valve overlap?
better volumetric efficiency and lower cylinder operating temperature.
what is the purpose of the crankshaft dynamic dampers?
absorb power pulses and reduce vibration.
what are the causes for engine sudden stoppage?
striking an object or seizure due to internal damage.
what inspection must be done after a sudden reduction in speed of en engine due to striking an object?
check propeller track and check the propeller drive shaft with a dial indicator for misalignment.
what are some of the precautions to be observed when engine removal is being accomplished?
disconnect battery, chock wheels, turn fuel valves off and install tail stand if necessary.
what is the indication of a primer that is leaking during operation?
the engine will not idle properly.
what may be the result of incorrect installation of piston rings?
excessive oil consumption.
what is the indication of an induction leak?
low power and uneven running.
what are the major components of a turbine engine?
air inlet, compressor section, combustion section, turbine section, exhauste section and accessory section.
what determines the two principal routes of compressors currently used in turbo jet aircraft engines?
centrifugal and axial flow.
what determines the amount of air passing through the turbine engine?
compressor speed, forward speed of the aircraft and air density.
how are rotor blades attached to disc type rotors?
by a bulb type root or a fir tree type root.
what are the three types of combustion chambers?
can, annular and can-annular.
what is the purpose of the interconnect tubes attached between can type combustion chambers?
far flame propagation during starting.
what prevents burning of combustion chambers?
cooling air along the inside of the chamber.
what is a split compressor system?
two concentric shafts joining the turbine shafts to their respective compressors.
where are carbon seals used in turbo jet engines?
oil seal in bearing area.
what is the major difference between turbo jet and turbo prop engines?
the turbo prop engine usually has more turbine stages than the turbo jet engine. in addition to operating the compressor and accessories, the turbo prop engine turbine drives a propeller.
what is a free turbine engine?
a turbine in the exhaust system to drive it's own power take off turbine or compressor independently of other turbines.
what is a turbo fan engine?
like a turbo prop except the propeller blades are replaced with a duct enclosed fan.
in reference to a reciprocating engine, where is a fuel flow indicating system generally connected to an engine fuel flow system?
between the engine fuel pump and carburetor.
what basic components are used in an engine fuel flow system?
transmitter and indicator.
what type of readout is indicated on a fuel flow system?
amount of fuel flow in pounds/gallons per hour.
what is the fuel pressure range for a float type carburetor?
3 to 5 psi
what is the reason for monitoring fuel flow?
fuel flow is an indication of fuel consumption and engine performance.
what does a manifold pressure gauge indicate?
absolute manifold pressure in inches of mercury.
what directly controls manifold pressure?
engine rpm and throttle opening.
on an engine equipped with a fixed pitch propeller, what is the relationship between manifold pressure and rpm?
as rpm increases, manifold pressure increases.
what does a reciprocating engine tachometer indicate?
engine crankshaft speed.
what are engine tachometer gauges designed to indicate?
percent of rpm.
what is indicated by turbine engine egt?
average temperature measured by individual thermocouples in the exhaust tailpipe.
what does turbine engine pressure ratio indicate?
thrust being developed.
what pressures are measured to obtain engine pressure ratio?
total inlet pressure and total turbine discharge pressure.
what is indicated by a turbo prop torque meter gauge?
torque being developed by the engine is used to indicate shaft horsepower.
Where should the thermocouple be installed on a single probe cylinder head temperature system?
on the hottest cylinder.
what is the electrical source for cylinder head temperature systems?
thermocouple.
Where is the location of the carburetor air temperature bulb?
located in the ram air intake duct.
what is the possible cause when oil pressure drops off severely, oil supply remains full and oil temperature is normal?
oil pressure transmitter or indicator malfunction.
How can engine turbine egt system be checked without running the engine?
by checking resistance of thermocouples and circuits.
when checking manifold pressure during run up or operation, in what position would the prop control be set?
high rpm/low pitch.
name 3 types of fire detector systems for engine fire protection.
overheat, rate of temperature rise and flame detectors.
what will happen to a thermocouple fire warning system on an engine that overheats slowly?
nothing, because it takes a fast rate of rise or rapid change to a high temperature to operate.
what electrical is needed for a thermocouple fire protection system?
aircraft electrical system and thermocouple produced voltage.
what is the minimum number of thermal switch units needed for a thermal fire protection system?
at least one.
what is the type of fire protection system that covers more area than a spot type temperature detector?
continuous loop system.
what is the principle of operation of a kiddie continuous loop fire protection system?
Two wires imbedded in a special ceramic core within inconel tube. one wire is ground and the second wore is a hot lead that provides current when the ceramic core material changes its resistance due to temperature.
what is the principle of operation of a fenwall continuous loop fire protection system?
a single wire surrounded by ceramic beads in an inconel tube. the resistance is lowered with a temperature rise.
what is the purpose of a fixed fire extinguishing system?
to discharge an inert agent that will not support combustion.
what methods are used to distribute fire extinguisher agents?
perforated tubing or discharge nozzles.
what is an hrd fire extinguishing system?
a fire extinguishing system with a high rate if discharge.
How is an hrd fire extinguisher agent distributed?
open end tubes.
How long does it take to discharge an hrd agent?
one to two seconds.
what happens to a thermal switch fire protection system when it is heated enough to operate?
an electrical ground is provided for a red warning light.
what fire extinguishing agent are used for aircraft engines?
carbon dioxide, freon anf halon.
what methods are used for discharging fire extinguisher agents?
mechanical or electrical.
what is the purpose of the discharge cartridge in a turbine engine fire extinguisher system?
electrically operated discharge cartridge will release the agent.
what is the purpose of the red and yellow discharge plugs associated with a turbine engine fire extinguishing system?
red for thermal and yellow for normal.
what will happen to an engine fire sensing loop when the sensing loop is excessively kinked or bent?
It will cause a false fire warning.
what two items on a turbine fire extinguisher system indicate low agent pressure in a container?
low pressure warning light and low pressure gauge.
what is the proper method for determining fire extinguisher container pressure?
container gauge pressure will indicate if the pressure is within limits marked on the gauge.
Where is the generator rating and performance data located?
stamped on a name plate attached to the generator.
How are DC generator terminals marked?
a, b and e
what is used to control DC generator voltage?
strength of field current.
what three components muke up a vibrator type DC regulator in an electrical system?
current limiter, reverse current cut out relay and voltage regulator.
Why are multigenerator systems paralleled?
each generator must share the load.
How many phases are used in most aircraft alternator systems?
three.
what determines the frequency of an alternator output?
the speed of rotation of the rotor and the number of poles.
How does the voltage regulator control the voltage of the alternator?
by regulating the voltage output of the DC exciter.
what is the probable cause of an engine starter that operates but does not turn the crankshaft?
starter does not engage due to damaged pinion or crankshaft.
what is the purpose of bonding wires on a powerplant installation?
to provide current paths, prevent static discharge and protect the aircraft and personal from lightening discharge.
what is the primary purpose of an aircraft reciprocating engine lubricant?
reduce friction between moving parts.
what is one of the most important properties an aircraft reciprocating engine oil must possess?
viscosity.
what is the most critical lubrication point in a gas turbine engine?
the exhaust turbine bearing.
what happens to oil at high temperatures?
oil becomes thin and the oil film is broken.
what factors must be considered in determining proper grade of oil?
operating load, rotational speed and operating temperatures.
how much sites aircraft engine oil weigh pretty gallon?
7.5 pounds.
why must reciprocating engines use an oil with high viscosity?
large operating clearances, high operating temperatures and high bearing pressure.
why is an oil tank required to have an expansion space?
to provide for expansion and oil foaming.
what is the purpose of an oil cooler bypass valve?
directs the oil through our around the oil cooler to keep oil temperatures within operating limits.
what does the oil temperature bulb usually sense?
engine oil inlet temperature.
what does the presence of metal particles in an engine oil screen indicate?
possible internal engine failure.
what are two areas of an engine oil system where oil screens may be located?
oil pressure system and scavenge system.
what are some oil contaminants?
gasoline, moisture, acids, dirts, carbon and metal particles.
what type of oil is generally used in turbine engine oil systems?
synthetic oil.
what could vw the cause of excessive oil consumption without evidence of oil leaks?
worn or broken poison rings.
what would be the indication of inadequate oil supply?
low oil pressure and high oil temperature.
what would be an indication of an obstruction in oil cooler passages?
high oil temperatures.
what could cause oil foaming?
diluted oil, contaminated oil and oil level being too high.
what are two types of turbine engine oil coolers?
air cooled and fuel cooled.
what controls oil pressure in a gear type oil pressure pump?
pull pressure relief valve.
went is it necessary to cut open a can cartridge type oil filter after removal?
to inspect the filtering element.
what is the advantage of multi viscosity oils?
wider temperature operating ranges.
what is the purpose of a magneto?
a magneto produces a high voltage which forces a spark to arc across the spark plug gap.
what are the three major circuits of a high tension magneto system? magnetic
magnetic, primary and secondary.
what are the comments of a high tension magneto circuit?
permenant multi pole rotating magnet, sift iron core and pole shoes.
in terms of engine crankshaft degrees, when does the ignition event occur
a specified number of degrees before tdc on the compression stroke.
where is the egap position in a magneto?
a few degrees before magnetic neutral.
what is the purpose of the condenser/capacitor in a magneto?
prevent arcing at the points and aids in the collapsing of the magnetic fields.
what happens when a magnetic rotor Is in the egap position and the primary breaker points open?
flow of current stops in the primary circuit and a high rate of flux change occurs in the core, including a pulse of high voltage in the secondary coil.
what are the two purposes of a high tension ignition harness?
supports the wires and protects them from damage by engine heat, vibration or weather and serves as a conductor for stray magnetic fields and cuts down the electrical interference.
when the ignoring switch is off, what is the condition of the ground circuit?
the circuit to ground is complete.
what is the purpose of the dual magneto ignition system?
system redundancy and improved combustion efficiency.
how can you identify a low tension ignition system?
by the presence of an external transformer coil and a short high tension lead.
which magneto is grounded when the magneto switch is selected to the right magneto?
left.
what is meant by spark plug reach?
distance from the gasket surface to the end of the threaded area.
what are the three events required to fire a spark plug in a cylinder when it's poison is in the prescribed position?
magneto is in the egap position, breaker points are opening and the distributor is electrically aligned with the cylinder wire.
what is the purpose of the magneto timing light?
it determines the exact moment that the magneto points open.
how can tdc of a piston be located?
a piston indication or a timing disc.
what factors are involved in magneto internal timing?
egap piston and distributor rotor position.
what is the most common type of ignition system used on turbine engines?
capacitor.
when are turbine engine ignition systems used?
for starting or when in flight conditions call for flame out protection.
what type of ignitor plugs are used in turbine engines?
annular gap type and constrained gap type.
what is the purpose of water injection?
enables more power to be obtained from engine at takeoff power.
what happens to fuel/air mixture in a reciprocating engine when the water injection system is operated?
the engine can be operated on best peste
power mixture and manifold pressure increased.
what are the two types of carburetors most commonly used of small reciprocating engines?

float and pressure
what is the function of the mixture control on float type carburetors?
controlling fuel/air mixtures.
what is the action of a float type carburetor accelerating system when the throttle is opened with a quick action?
a charge of fuel will enrich the mixture in the venturi.
when does a carburetor economize system needle valve open?
above 60 to 70 pure cent rated power.
what is the purpose of a carburetor economize system?
for additional fuel at high power for cooling the engine to prevent detonation.
where does a pressure infecting carburetor obtain fuel pressure?
engine driven fuel pump.
what operates an automatic mixture control?
a sealed bellows that contracts or expands with a change in atmospheric pressure.
what position of a pressure injection carburetor manual mixture control would stop operations?
idle cutoff position.
what are the operating principals of direct fuel injection systems?
measure engine air consumption using air flow forces to control fuel flow and supplies fuel from an injection pump directly into each cylinder.
why should a pressure carburetor be filed with fuel and allowed to soak for 8 hours prior to installation?
to soak the diaphragms and render them pliable to the degree that they were when the unit was originally calibrated.
what problem is caused by an excessively rich mixture at idle?
spark plug fouling.
what is the indication of rpm when an idle mixture is set correctly and the mixture control is placed to the idle cutoff position?
a slight rise in rpm prior to decreasing.
why should engine rpm be accelerated periodically when making carburetor adjustments?
to clear the engine.
what is the function of the turbine engine fuel control unit?
automatically satisfies fuel retirements of the engine.
what are the two basic types of turbine fuel control units?
electronic and hydromechanial
what are dm some of the engine variables directed by a turbine engine fuel control unit?
power lever position, compressor rpm, compressor inlet temperature, compressor discharge pressure, burner pressure and either egt or tit.
what two sources are used in turbine engine fuel systems for fuel heat?
bleed air and engine oil.
how is fuel delivered to a turbine engine burner section?
from the fuel control to one or more spray nozzles.
what is another type of fuel metering system used on reciprocating engines other than carburetors?
direct fuel infection.
what is the purpose of engine driven fuel pumps?
to deliver a continous supply of fuel at the proper pressure at all times.
what are the two categories of rubies engine fuel pumps?
constant and variable displacement
a gear type pump is classified in what category?
constant displacement.
what protects an engine from fuel porno seizure?
shear section of the shaft.
what happens to excess fuel not required by an engine consent displacement pump?
the pressure relief valve bypasses excess fuel.
what type of pump varies the amount of fuel discharged with any speed?
variable displacement pump.
what is the purpose of a pressurization and dump valve?
provide positive cutoff of fuel to prevent fires, choking and providing positive pressurization for operation.
what type of engine driven pump is widely used other than gear and piston pumps?
rotary vane type pump.
what is the purpose of fuel booster pumps?
to supply engine driven fuel pumps.
what is the most common type of fuel booster pump?
centrifugal type.
what is the cause of vapor lock?
low fuel pressure, high fuel temperature and excessive fuel turbulence.
why is value lock serious?
the fuel flow may be completely blocked.
what is the purpose of main line fuel straining?
to keep foreign mayer out of the carburetor.
what are the purposes of fuel selector valves?
provides a means for shutting off fuel flow, tank and engine selections, crossfeed and fuel transfer.
what unit in the turbine engine fuel system is susceptible to the formation of ice?
fuel filter.
what is the safety feature in an engine fuel system micron filter?
a bypass valve.
what method is used to prevent ice in turbine fuel filters?
air into liquid or liquid into liquid heat exchangers.
what is a duplex fuel nozzle used in turbine engines?
a fuel nozzle with two spray patterns.
what do you look for during an external inspection of an engine driven fuel pump?
leaks and security of mounting.
name an advantage of turbo fan over turbo jet.
additional thrust without increasing fuel flow.
what are the functions of the axial flow turbine nozzles?
they prepare the mass airflow due driving the turbine rotor and deflect the gasses to a specific angle.
what is one way of relieving thermal stress on a turbine disk?
by directing bleed air in to the face of the disk or by the grooving in the turbine disk.
what type of compressor blade damage may be found when inspecting compressor blades?
dents, galling, pitting, cracks, scratches, burrs burns and gouges.
what is used to mark turbine parts for disassembly?
layout dye or chalk.
what is the effect of relative humidity in turbo jet power?
negligible.
what may be the indications if s turbo jet engine is out of trim?
engine had high egt and engine pressure for take off power.
what would the possible cause be for a turbo jet engine with high egt, low rpm and high fuel flow at all engine pressure ratio settings?
possible turbine damage or loss of turbine efficiency.
what functions need to be accomplished in order to prepare an engine for a 100 hour inspection?
remove cowling and clean engine.
how can a mechanic visually identify an engine?
by the engine data plate.
what may be used as a guide for 100 hour inspections on aircraft engines?
FAR part 43; appendix D.
what additional inspection must be performed if a cylinder compression is weak?
internal cylinder inspection.
where are engine operating limits listed?
TCDS or engine specifications
what is the spectrometric oil analysis program used on turbine engines?
under certain conditions and within certain limitations, internal condition of the engine van be evaluated.
what type of FAA approval is required when a change to an engine type design is not enough to require a new TCDS?
an STC can be issued.
what pub is needed to inspect an engine for conformity with specifications?
engine specifications or TCDS
what ADs would apply to a specific engine?
review ADs and biweeklys.
what publication is needed to check an engine for normal operation?
manufacturer's operating manual.
what is the purpose a hot section impeding of a turbine engine?
to determine mechanical integrity.
when is an engine SB compliance mandatory?
when it is part of an AD.
how can a turbine engine be leak checked without running the engine?
motor the engine with the starter, ignition and fuel off.
what pub is needed to perform a turbine engine over speed inspection?
manufacturer's maintenance and service pubs.
what type of inspection is required when a turbine engine experiences an egt over temperature?
hot section inspection.
What're do you find a list of life limited parts?
TCDS or inspection and limitations section of manufacturer's maintenance manuals.
what criteria is used to determine the replacement of life limited turbine engine components?
cycles, hours or calender times.
how often should the humidity indicator be inspected of metal containers spring engines under normal conditions?
180 days.
when removing and inspecting turbo jet turbine engine blades, I went is it important that they be installed in the same location?
to maintain balance of the turbine wheel.
what must be included in a checklist for 100 hour imdirective on an aircraft engine?
run the aircraft ending to determine daisies m satisfactory performance iaw the manufacturer's recommendations of power output, fuel and oil pressure and cylinder and oil temperature.
what are the three units in a reciprocating engine induction system?
carburetor, air scoop and intake manifold.
what is the effect on the engine performance when induction system icing occurs?
engine power loss and erratic operations.
what are the three classifications of ice?
impact ice, fuel evaluation and throttle ice.
what method is used to prevent induction system icing?
raising the temperature of induction air with a preheater.
how is ice coated on some aircraft in carburetor heat is too low to coat the ice?
alcohol is used as a deicing agent.
when is carburetor throttle ice likely to form due to throttle position?
during part throttle operation when the throttle is near the closed position.
what ate the two types of supercharged induction system?
internally driven and externally driven.
what is the function of a distributor impeller?
driven by the engine camshaft, it does not increase air pressure, but as the fuel goblets stroke the impeller, it will create a more homogenous mixture.
how does an internally driven supercharger driven by the engine crankshaft boodt air pressure?
a high speedimpeller compresses the fuel/air mixture aftet it leaves the carburetor.
where does an externally driven supercharger derive is power?
energy of engine exhaust gasses directed against turbine blades.
what is the function of a turbocharger waste gate?
it regulates the amount of exhaust gasses that drive the turbine.
what may be the indication of leaking intake pipes?
engine runs rough at low rpm.
what may be the indication of an induction system obstruction?
engine gals to start or power is low.
what may be the indication if a turbocharger waste gate will boot close?
aircraft may not reach critical altitude.
what would be the probable cause of a turbocharger engine that surges?
waste gate controller malfunction.
what is used on many turbocharged engines for the rate gate actuator power?
oil pressure.
what engine power indication will occur when the carburetor heat is applied to an operating engine?
a slight loss in engine power.
what is the danger of applying carburetor heat with high engine power?
detonation.
what happens to the induction air supply in a filtered air induction system when the filter becomes restricted?
the filter is bypassed or loss of power.
what is the indication of a dirty air inlet filter?
low power.
what are the main reasons that excessive heat affectsis undesirable in any air cooled reciprocating engine,
affects the behavior of combustion, weakens and shortens the life if the engine parts and impairs lubrication.
what type is cooled cylinder construction increases the effective surface area of cooling?
cooling fins are used.
what is engine cooling?
transfer of heat from engine cylinders to the air.
what should be done to cylinders with excessive cooling fin area broken off?
replace the cylinder.
what is the principle function of engine cowling and baffles?
designed to direct air flow overt the cylinders and engine accessories fit powerplant cooling.
what method is used to control the flow of air through the cooling area of an engine?
cowl flaps.
what is am augmented cooling system?
a system incorporating inner and outer rubes that extend from the engine compartment to the rear of the nacelle. the inner tube is fed exhaust and the outer tube is open to the engine compartment.
what type of power is used to operate cowl flaps?
manual, electrical and hydraulic.
how are accessories cooled?
clay tubes are built into baffles to direct cooling air past the accessories.
where should cowl flaps be positioned during ground operations?
full open.
what information must be consulted prior to reprofiling a cooling fin?
manufacturer's service pubs.
what are the functions of the engine cowling?
streamlines engine to reduce drag and control air flow oat cylinders.
what is the purpose of a cowl air seal?
fixes air to circulate around and through the baffle systems.
why is cowl flap adjustment important?
the movement must be within tolerance to keep cylinder head temperatures within allowable limits.
Where must cooling air flow to cook a turbine engine?
through the inside of the engine.
what areas of the turbine engine are cooled by air padding through the engine?
combustion Chaney and turbine.
what is the source of bleed sure vented to the turbine engine bearings and other parts in some engines?
turbine engine compressor.
other than cooling air, what method is used to cool components and structures adjacent to turbine engines?
insulation blankets.
what dies turbine engine insulation protect from heat?
structure, fuel and oil.
what type of materials are used to make turbine engine insulation blankets?
aluminum, glass fiber and stainless steel.
how are high temptation noxious gasses removed and disposed of in a reciprocating engine?
by the engine exhaust system.
what is the function of an exhaust system?
provide protection against potentially destructive action of exhaust gasses.
what are the two types of reciprocating engine exhaust systems?
short stack and collector system.
what type of exhaust system is used on turbo/supercharged engines?
collector systems.
what type of system is generally used on non-supercharged low power engines?
short stack/pen systems.
what system raises engine exhaust back pressure?
collector system.
why is an exhaust system considered a severe hazard?
carbon monoxide poisoning, loss of power and fire.
why should lead, zinc or galvanized marks not be made on exhaust systems?
the marks can cause changes in the molecular structure when heated and will cause cracks.
what is the indication of exhaust gas leaks?
a flat gray or sooty black trail.
how are exhaust system internal baffles or diffusers inspected?
disassemble for visual insurrection, as necessary.
how does a failure of exhaust system internal baffles or diffusers sometimes cause a loss of engine power?
restricts the flow of exhaust gasses.
what happens to the engine power when a heat exchanger leaks exhaust gasses into the engine induction system?
there is a loss is power.
where are exhaust manifold and attack failures usually found?
at welded or clamped points.
what is a common cause of turbocharger waste gate sticking?
Coke deposits or carbon build up.
where are turbocharged exhaust system leaks very damaging at high altitudes?
due to the pressure differential the leak will escape with torch like intensity.
what ate exhaust system coke deposits?
excessive carbon build up.
what would happen to turbine engine performance in the exhaust nozzle shape is changed?
the performance and egt would change.
what are the components of a typical rubinstein exhaust nozzle?
tail cone, exhaust duct and support struts.
what is the purpose of thrust reversers?
aid in decelerating an aircraft after landing.
what is the function of the thermocouple proves in s turbine exhaust tailpipe?
measure egt.
how do you determine the repairability of a damaged propeller blade?
reference the manufactures maintenance manual.
what is the purpose of a propeller?
the blades produce forces that create thrust to pull or push an airplane through the air.
what is a fixed pitch propeller?
the blade angle is built into the propeller and cannot be changed.
what type of blade angle change will occur in a propeller that is pitch controlled by a propeller governor during constant power drive?
the blade angle all increase to overcome overspeeding.
other than maintaining constant speed, what are two actions of some controllable propeller systems?
reverse and feather.
what is the purpose of metal round tipping fastened to a wooden propeller leading edge?
to protect the propeller from damage.
when engine vibration is retorted, what should be checked to determine if it is caused by the engine or propeller?
blade tracking and low blade angle setting.
what is blade tracking?
determining the position of the blade tips in relation to each other.
what may be used to determine proper blade angle?
a propeller protractor.
what should be used to clean aluminum propeller blades and hubs?
the propeller should be cleaned iaw the manufacturer's recommendations.
what positions of a two bladed propeller are used during a static balance check?
vertical and horizontal.
what two forces are balanced in a propeller governor in an on speed condition?
spring and flyweight.
on light aircraft propellers, what is the purpose of the centrifugal force acting on propeller blade counterweights?
the action is to increase propeller blade pitch.
what happens to a contract showed feathering propeller when the propeller's governor oil pressure is zero?
propeller will feather.
what may be adjusted in a hyftomatuc propeller system to increase or decrease rpm?
propeller governor.
what type systems are used for propeller ice control?
fluid (alcohol) and electrical.
what type of nondestructive testing sound be accomplished to the propeller after blending?
procedures recommended by the manufacturer.
what is the function of the negative torque sensing device in a turbo prop system?
mechanically actuates a linkage in the propeller control which results in increased blade angle until the propeller is vote driving the engine.
what is the purpose of an oil accumulator connected to a propeller governor?
unfeathering oil pressure.
how is feathering accomplished on a constant speed propeller?
releasing the governor oil pressure allows the counterweights and feathering spring to feather the propeller.
what unit is used to sense prowler rpm in the light twin aircraft propeller synchronizer?
the propeller governors have magnetic pickups that count the propeller revolutions and send a signal to the synchronizer unit.
what places the greatest demand on an apu?
bleed air.
what starts a typical apu?
electrical starter (sometimes a hydraulic pre-charged accumulator)
where does an apu get is fuel?
main aircraft fuel supply.
what speed does the apu operate at?
at a very high rpm, which is controlled by the apu fuel control and stored sensitive if overspeeding occurs.
how does a heavily loaded apu prevent itself from overheating?
air load valve.
how do you facilitate the cooling down of an apu prior to shut down?
completely unload the apu of all external demands (air and electrical power).
what are the operational effects of following to the required cool down cycles?
it adds to longevity to the life of the apu.
how long is a typical cool down cycle of an apu?
approximately 3 to 4 minutes.
how is the operational speed of an apu controlled?
spy fuel control adjust the speed by adjusting fuel flow.
name at least two uses for an apu.
engine start, aircraft ground operations, anti icing, passenger air
what type of operational practices can cause thermal shock to an apu?
not following the prescribed cool down cycle.
what powers the variable inlet guide vanes on an apu?
fuel pressure from the fuel control system.
what does the typical apu consist of?
air inlet, compressor, combustion, turbine, fuel control and load control valve.
what is the function of a typical apu?
to provide air pressure for the engine staying, anti icing, and electrical power for aircraft system operation, both in flight and on the ground.