UPON INSPECTION OF THE SPARK PLUGS IN AN AIRCRAFT ENGINE, THE PLUGS WERE FOUND CAKED WITH A HEAVY BLACK SOOT. THIS INDICATES: a lean mixture a rich mixture worn oil seal rings.
REPAIRS OF ALUMINUM ALLOY ADJUSTABLE PITCH PROPELLERS ARE NOT PERMITTED TO BE MADE ON WHICH OF THE FOLLOWING PROPELLER BLADE AREAS? face shank back.
AS AN AID TO COLD WEATHER STARTING, THE OIL DILUTION SYSTEM THINS THE OIL WITH: kerosene alcohol gasoline.
A CONSTANT SPEED PROPELLER PROVIDES MAXIMUM EFFICIENCY BY: increasing blade pitch as the aircraft speed decreases increasing the lift coefficient of the blade adjusting blade angle for most conditions encountered in flight.
BETWEEN EACH ROW OF ROTATING BLADES IN A TURBINE ENGINE COMPRESSOR, THERE IS A ROW OF STATIONARY BLADES WHICH ACT TO DIFFUSE THE AIR. THESE STATIONARY BLADES ARE CALLED: stators rotors buckets.
WHICH OF THE FOLLOWING IS A CHARACTERISTIC OF A THRUST BEARING USED IN MOST RADIAL ENGINES? deep groove ball tapered roller double row ball.
GENERALLY, THE PRACTICE WHEN TRIMMING AN ENGINE IS TO: turn all accessory bleed air off make adjustments (as necessary) for all engines on the same aircraft with accessory bleed air settings the same--either on or off turn all accessory bleed air on.
IN REGARD TO USING A TURBINE ENGINE OIL ANALYSIS PROGRAM, WHICH OF THE FOLLOWING IS NOT TRUE? generally, an accurate trend forecast may be made after an engine's first oil sample analysis it is best to start an oil analysis program on an engine when it is new a successful oil analysis program should be run over an engine's total operating life so that normal trends can be established.
FULL FLOATING PISTON PINS ARE THOSE WHICH ALLOW MOTION BETWEEN THE PIN AND: both the piston and the small end of the connecting rod the piston both the piston and the large end of the connecting rod.
RECIPROCATING ENGINES USED IN HELICOPTERS ARE COOLED BY: blast tubes on either side of the engine mount the downdraft from the main rotor a fan mounted on the engine.
WHAT MAINTENANCE RECORD(S) IS/ARE REQUIRED FOLLOWING A MAJOR REPAIR OF AN AIRCRAFT ENGINE? entry in logbook entries in the engine maintenance record and FAA form 337 entries in engine maintenance records and a list of discrepancies for the FAA.
WHICH STATEMENT IS TRUE REGARDING BEARINGS USED IN HIGH POWERED RECIPROCATING AIRCRAFT ENGINES? there is less rolling friction when ball bearings are used than when roller bearings are employed crankshaft bearings are generally of the ball-type due to their ability to withstand extreme loads without overheating the outer race of a single row, self aligning ball bearing will always have a radius equal to the radius of the balls.
ON AN AIRCRAFT TURBINE ENGINE, OPERATING AT A CONSTANT POWER, THE APPLICATION OF ENGINE ANTI-ICING WILL RESULT IN: a false EPR reading an increase in EPR noticeable shift in EPR.
THE DIFFUSER SECTION OF A JET ENGINE IS LOCATED BETWEEN: the burner section and the turbine section station no. 7 and station no. 8 the compressor section and the burner section.
WHEN IS THE FUEL/AIR MIXTURE IGNITED IN A CONVENTIONAL RECIPROCATING ENGINE? when the piston reaches top dead center on the compression stroke when the piston has reached top dead center of the intake stroke shortly before the piston reaches the top of the compression stroke.
WHICH OF THE FOLLOWING DEFECTS IS CAUSE FOR REJECTION OF WOOD PROPELLERS? solder missing from screw heads securing metal tipping an oversize hub or bolthole, or elongated boltholes no protective coating on propeller.
WHEN DOES VALVE OVERLAP OCCUR IN THE OPERATION OF AN AIRCRAFT RECIPROCATING ENGINE? at the end of the power stroke and the beginning of the exhaust stroke at the end of the compression stroke and the beginning of the power stroke at the end of the exhaust stroke and the beginning of the intake stroke.
WHAT IS A FUNCTION OF THE AUTOMATIC PROPELLER SYNCHRONIZING SYSTEM ON MULTIENGINE AIRCRAFT? to control engine RPM and reduce vibration to control the tip speed of all propellers to control the power output of all engines.
COLD STRAIGHTENING A BENT ALUMINUM PROPELLER BLADE MAY BE ACCOMPLISHED BY: an appropriately rated repair station or the manufacturer the holder of a mechanic certificate with a powerplant rating a person working under the supervision of the holder of a mechanic certificate with both airframe and powerplant ratings.
IF THE POINTS IN A VIBRATOR TYPE VOLTAGE REGULATOR STICK IN THE CLOSED POSITION WHILE THE GENERATOR IS OPERATING, WHAT WILL BE THE PROBABLE RESULT? generator output voltage will increase generator output voltage will not be affected generator output voltage will decrease.
WHICH METHOD IS COMMONLY USED TO ADJUST THE LEVEL OF A FLOAT IN A FLOAT TYPE CARBURETOR? add or remove shims under the needle valve seat lengthening or shortening the float shaft change the angle of the float arm pivot.
GENERALLY, A SMALL CRACK JUST STARTED IN A CYLINDER BAFFLE: may be stop drilled requires repair by reinforcing, such as installation of a doubler over the area requires no action unless it grows or is branched into two cracks.
FUEL IS DISCHARGED FOR IDLING SPEEDS ON A FLOAT TYPE CARBURETOR: through the idle discharge air bleed from the idle discharge nozzle in the venturi.
HOT SPOTS IN THE COMBUSTION SECTION OF A TURBOJET ENGINE ARE POSSIBLE INDICATORS OF: dirty compressor blades malfunctioning fuel nozzles faulty igniter plugs.
WHAT DEVICE IS USED TO CONVERT ALTERNATING CURRENT, WHICH HAS BEEN INDUCED INTO THE LOOPS OF THE ROTATING ARMATURE OF A DC GENERATOR, TO DIRECT CURRENT? inverter a rectifier a commutator.
FUEL SCHEDULING DURING APU START AND UNDER VARYING PNEUMATIC BLEED AND ELECTRICAL LOADS IS MAINTAINED: automatically by an aircraft main engine fuel control unit manually through power control lever position automatically by the APU fuel control system.
WHICH STATEMENT IS TRUE REGARDING A THERMOCOUPLE TYPE CYLINDER HEAD TEMPERATURE MEASURING SYSTEM? when the master switch is turned on, a thermocouple indicator will move off scale to the low side the voltage output of a thermocouple system is determined by the temperature difference between the two ends of the thermocouple the resistance required for cylinder head temperature indicators is measured in farads.
THE TURBINE SECTION OF A JET ENGINE: utilizes heat energy to expand and accelerate the incoming gas flow drives the compressor section increases air velocity to generate thrust forces.
WHICH OF THE FOLLOWING DEFECTS WOULD LIKELY CAUSE A HOT SPOT ON A RECIPROCATING ENGINE CYLINDER? cowling air seal leakage too much cooling fin area broken off a cracked cylinder baffle.
WHERE DO STRESS RUPTURE CRACKS USUALLY APPEAR ON TURBINE BLADES? across the blade root, parallel to the fir tree along the leading edge, parallel to the edge across the leading or trailing edge at a right angle to the edge length.
THE EXPLOSIVE CARTRIDGE IN THE DISCHARGE VALVE OF A FIRE EXTINGUISHER CONTAINER IS: not a life dated unit a life dated unit mechanically fired.
WHAT IS THE FREQUENCY OF MOST AIRCRAFT ALTERNATING CURRENT? 115 hertz 400 hertz 60 hertz.
IN ADDITION TO LUBRICATING (REDUCING FRICTION BETWEEN MOVING PARTS), ENGINE OIL PERFORMS WHAT FUNCTIONS?
1- COOLS
2- SEALS
3- CLEANS
4- PREVENTS CORROSION
5- CUSHIONS IMPACT (SHOCK) LOADS 1, 3, 4 1, 2, 3, 4, 5 1, 2, 3, 4.
WHEN AN ELECTRIC PRIMER IS USED, FUEL PRESSURE IS BUILT UP BY THE: suction at the main discharge nozzle booster pump internal pump in the primer solenoid.
WHICH OF THE FOLLOWING, OBTAINED DURING MAGNETO CHECK AT 1,700 RPM, INDICATES A SHORT (GROUNDED) CIRCUIT BETWEEN THE RIGHT MAGNETO PRIMARY AND THE IGNITION SWITCH? both-1,700 RPM; R-1,625 RPM; L-1,700 RPM; OFF-1,625 RPM both-1,700 RPM; R-0 RPM; L-1,675 RPM; OFF-0 RPM both-1,700 RPM; R-0 RPM; L-1,700 RPM; OFF-0 RPM.
WHAT TYPE OF NUTS ARE USED TO HOLD AN EXHAUST SYSTEM TO THE CYLINDERS? brass or heat-resistant nuts high-temperature fiber self-locking nuts high-temperature aluminum self-locking nuts.
TO WHAT ALTITUDE WILL A TURBO CHARGED ENGINE MAINTAIN SEA LEVEL PRESSURE? critical altitude pressure altitude service ceiling.
WHAT WOULD BE THE POSSIBLE CAUSE IF A GAS TURBINE ENGINE HAS HIGH EXHAUST GAS TEMPERATURE, HIGH FUEL FLOW, AND LOW RPM AT ALL ENGINE POWER SETTINGS? loose or corroded thermocouple probes for the EGT indicator turbine damage or loss of turbine efficiency fuel control out of adjustment.
THE ACTIVE CLEARANCE CONTROL (ACC) PORTION OF AN EEC SYSTEM AIDS TURBINE ENGINE EFFICIENCY BY: automatically adjusting engine speed to maintain a desired EPR ensuring turbine blade to engine case clearances are kept to a minimum by controlling case temperatures adjusting stator vane position according to operating conditions and power requirements.
MAIN BEARING OIL SEALS USED WITH TURBINE ENGINES ARE USUALLY WHAT TYPE(S)? teflon and synthetic rubber labyrinth and/or silicone rubber labyrinth and/or carbon rubbing.
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