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A&P - POWERPLANT ORAL (JEPPESEN) QUESTIONS WITH COMPLETE SOLUTIONS GRADED A+
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A&P - POWERPLANT ORAL (JEPPESEN) QUESTIONS WITH COMPLETE SOLUTIONS GRADED A+
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A&P - POWERPLANT ORAL (JEPPESEN) QUESTIONSWITH COMPLETE SOLUTIONS GRADED A+
What is the purpose of dynamic dampers on crankshafts? ✔✔They reduce
engine vibration.
What types of bearings are generally found in reciprocating engines? ✔✔Plain,
ball and roller bearings.
Are the connecting rods used in each cylinder of a radial engine the same?
Explain. ✔✔No. Radial engines use master and articulating rod assemblies.
Name the different types of piston rings. ✔✔Oil control, compression, and oil
scraper.
Where should piston ring gaps be installed relative to each other, and why?
✔✔Compression ring gaps should be staggered so that they do not align. This
prevents excessive blow-by.
What could result from incorrectly installed piston rings? ✔✔Excessive oil
consumption.
What purpose do oil control rings serve? ✔✔They regulate the thickness of the
oil film on the cylinder walls.
What is used to help prevent valve surge or floating in an aircraft engine?
✔✔Two or more springs are used on each valve.
,On engines equipped with hydraulic valve lifters, what should the running valve
clearance be? ✔✔Zero.
What is the purpose of valve overlap? ✔✔It allows better volumetric efficiency
and lowers cylinder operating temperatures
What indications are given in the event of a leaking or open primer while the
engine is running? ✔✔The engine will not idle properly.
A cold cylinder is found when troubleshooting a running engine. What does this
indicate? ✔✔No combustion in that cylinder.
When pulling a propeller through, a hissing sound is heard, indicating valve blow-
by. What procedure should be performed next? ✔✔A compression check
should be performed to identify the faulty cylinder.
What is the purpose of performing a compression test? ✔✔To determine if the
valves, pistons, and rings are sealing properly
When an engine is overhauled, how is the total time affected? When an engine is
rebuilt, how is its operating history affected? ✔✔The total time on the engine
must be continued and the time since major overhaul is entered into the engine
log. It the manufacturer rebuilds the engine, it is granted a zero-time status and is
considered to have no previous operating history.
,What inspections should be performed after a propeller strike without sudden
stoppage? ✔✔1.Inspect engine mounts, the crankcase, and the nose section for
damage.
2.Inspect the oil and oil filters/screens for metal particles.
3.Inspect the crankshaft or driveshaft for cracks and misalignment.
Name some of the precautions that should be performed prior to engine removal.
✔✔Disconnect the battery, turn off the fuel valves, chock the wheels, and if
necessary, install a tail stand.
When inspecting a piston, where are cracks most likely to be found? ✔✔In
those areas that are highly stressed; usually the base of the piston bosses, inside
at the junction of the bore and the walls, and the ring lands.
What does it mean if an engine part is within "serviceable limits"? ✔✔It means
that the part is within the manufacturer's limits and can be used in an engine
(does not require replacement).
What tools or instruments are used to inspect a cylinder barrel for out-of-
roundness? ✔✔A dial indicator or an inside micrometer is usually used to
measure the top of the cylinder and at the skirt. A telescopic gauge and
micrometer can also be used. Two readings should be taken 90# to each other.
How can a loose stud in an engine crankcase be repaired? ✔✔Remove the loose
stud and inspect the hole for size and thread condition. It may be necessary to use
an oversize stud or Heli-Coil.
, What publication is used to check an engine for normal operation?
✔✔Manufacturer's maintenance manual.
A weak cylinder is found during a compression check. What must be inspected?
✔✔The inside of the cylinder.
What purpose does an oil analysis serve? ✔✔Metal particles in the oil show
normal and abnormal wear of the engine. This helps in evaluating the engine's
internal condition.
What inspections should be performed on an engine that has been in storage?
✔✔Perform an inspection to determine if there is any corrosion damage.
Where would a carburetor air temperature bulb be located? ✔✔In the ram air
intake duct.
What is the fuel pressure range on float-type carburetors? ✔✔3 to 5 psi.
Where is the fuel flow indicating system generally connected within a carbureted
reciprocating engine? ✔✔Between the engine fuel pump and the indicator.
Name the basic components of a fuel flow system. ✔✔The transmitter and the
indicator.
What unit of measure is generally used to indicate fuel flow? ✔✔Pounds or
gallons per hour.
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