PPT Flashcards
In what position should the crankshaft be when a magneto is being tuned to the engine?
The piston in cylinder #1 should be in position for ignition to occur.. about 30° BTDC on the compression stroke.
What is checked on engine runup to determine the operational condition of the engine?
- Idling RPM & MAP
- Maximum Static RPM & MAP
- Engine Acceleration
- Magneto Drop
- Ignition Switch Safety Check
- Propeller Pitch Change
- Propeller Feathering
- Oil Pressure
- Fuel Pressure
- Fuel Flow
“IIMMPPFFOE”
Ignition switch safely check
Idle RPM & MAP
Max static RPM & MAP
Magneto Drop
PROP PITCH
PROP FEATHERING
FUEL FLOW
Fuel Pressure
Oil Press
Engine ACCELERATION
How are the four strokes of a reciprocating engine similar to the sections of a turbine engine?
Intake = air inlet section, compression = compressor section,
ignition and power = combustion and turbine sections,
exhaust = exhaust section.
What type of turbojet engine is commonly used in commercial aviation due to lower noise and better fuel consumption?
High-bypass turbofan engines.
What are three types of flow-indicating systems used for turbine engines?
1) Vane -type flow meters
2) Synchronous Mass -type flow
3) Electronic Mass - flow meters.
What do mass flow systems measure?
The mass of the flow, which is affected by the density of the fuel, in turn affected by the fuel temperature.
In what units is an electronic motorless mass flow meter system calibrated?
Pounds per hour of fuel flow.
What is indicated in a turbine engine if the fuel flow for all conditions is high?
If there are other instrument abnormalities, there are possibly damaged turbine components.
Who is authorized to repair a fuel flow indicating system?
The components can be repaired only by an FAA approved repair station certified for the particular instruments.
Where can you find the electrical power requirements for a fuel flow indicating system?
In the aircraft maintenance manual.
Where in the fuel system is the fuel flow transmitter located?
Between the fuel control and the fuel nozzles.
What adjustments and rigging are accomplished on a turbine engine?
The primary rigging on a turbine engine involves the adjustment of power control levers and cables, followed by careful adjustment of the fuel control unit to trim the engine for the correct idle speeds and to obtain maximum thrust.
What is a hot-tank lubrication system for a turbojet engine?
A lubrication system in which the oil cooler is in the pressure subsystem and the scavenged oil is not cooled before it is returned to the tank.
What is a cold-tank lubrication system for a turbojet engine?
A lubrication system in which the oil cooler is in the scavenge subsystem, and the scavenged oil is cooled before it is returned to the tank.
Where does a dry sump oil system store oil?
In a reservoir outside the engine through the use of a scavenge pump and external tubing.
What color and marking identifies the fluid lines that carry the fire extinguishing agent in an aircraft?
Brown tape with a series of diamonds on it.
What is the purpose of an air-oil separator, or deaerator, in a turbine engine oil tank?
In normal operation, the oil picks up a quantity of air and is swirled as it enters the deaerator. The swirling action releases the air from the oil, and the air is used to pressurize the oil tank.
How is oil pressure regulated in an aircraft engine?
A pressure-relief valve senses the desired pressure and sends excess oil back into the engine sump.
What is the purpose of the restricted orifice in the line between the oil pressure gauge and the engine?
The restricted orifice helps dampen any pulsations in the oil pressure caused by the pump.
Why is it important to keep spare plugs in numbered holes when removed from an engine?
Spark plugs tell a good deal about the internal condition of the cylinders from which they were taken. By knowing the cylinders from which each spark plug came, the mechanic can take the proper action when a spark plug indicates conditions such as detonation or overheating.
Why should a torque wrench always be used when installing spark plugs in an aircraft engine?
If the spark plugs are not put in tight enough, there is the possibility of a poor seal. If they are put in too tight, there is danger of cracking the insulation or damaging the threads on the spark plug or the cylinder.
What are six functions of oil in an aircraft engine?
a. Reduces friction.
b. Seals and cushions.
c. Removes heat.
d. Cleans inside the engine.
e. Protects against corrosion.
f. Performs hydraulic action.
What kind of gauge should be used to measure the electrode gap in aircraft spark plugs?
A round wire gauge.
What is meant by the reach of a spark plug?
The length of the threads on the spark plug that screw into the cylinder head.
