ASA Powerplant Codes Flashcards
What is meant by a hot section inspection?
An inspection of the hot section of a turbine engine. The hot section includes the combustors, the turbine, and the exhaust system.
What is meant by on-condition maintenance of a turbine engine?
The monitoring of the engine performance at regular intervals and determining when maintenance is required based on certain operating parameters specified by the engine manufacturer.
What checks of a turbine engine are necessary to verify preflight condition?
a. Inspect the cowling and all air inlet areas and attachment of the engine to the airframe.
b. Inspect the inlet guide vanes and the first stages of the compressor or fan blades.
c. Check for unusual noise when the compressor is rotated.
d. Inspect the rear turbine and exhaust system.
e. Check the quantity of the lubricating oil for the engine and the constant-speed drive unit.
f. Check the ignition system for operation by listening for the sparks.
What are three types of flow-indicating systems used for turbine engines?
Vane-type flow meters, synchronous mass-type flow meters, and electronic motorless mass flow meters.
What do mass flow systems measure?
The mass of the flow. This is affected by the density of the fuel which is in turn affected by the fuel temperature.
In what units is an electronic motor less 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 instruments 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 certificated 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 transmitters located?
Between the fuel control and the fuel nozzles.
What factors must be considered when determining wire size?
a. System voltage
b. If the circuit has an intermittent or continuous load
c. Current
d. Distance in feet of the wire run
e. The temperature rating of the wire to be used
f. The ambient temperature of the area where the wire will be installed
g. The number of wires in the wire bundle
h. The percentage of time the wire bundle will be loaded
I. The maximum altitude the wire will see
What kind of electric starting system is used on many of the smaller turbine engines?
a starter-generator
Why are air-turbine starters superior to electric starters for large turbine engines?
They are light weight for the torque they produce
Where does an air-turbine starter get its air for starting the engines on a jet transport airplane?
From an APU, GPU, or from a running engine.
What prevents too high an air pressure from overspending an air-turbine starter?
The air shutoff and regulating valve.
Where does an air-turbine starter get its lubricating oil?
It has a self-contained lubrication system with the oil held in the starter housing.
What device in an air-turbine starter warns an aviation mechanic if there are any metal chips or particles in the oil?
Magnetic chip detectors warn of any metal contamination in the oil.
What is the function of a capacitor in a magneto?
The capacitor minimizes arcing at the breaker points, and it speeds up the collapse of the primary current as the breaker points open.
What happens in a magneto ignition system when the ignition switch is placed in the OFF position?
the primary circuits is connected to ground.
What is checked when a magneto is internally timed?
Internally timing a magneto consists of adjusting the breaker points so they will open at the instant the rotating magnet is in its E-gap position, and the distributor rotor is in position to direct the high voltage to cylinder number one.
In what position should the ignition switch be placed when using a timing light on the magnetos?
In the BOTH position.
What is the E-gap in magneto timing?
The E-gap angle is the position of the rotating magnet where the primary current flowing in the magneto coil is the greatest. The breaker points open when the rotating magnet is in its E-gap position.
What malfunction in the ignition system would cause an aircraft reciprocating engine to continue to run after the ignition switch is placed in the OFF position.
The ignition switch is not grounding the magneto primary circuit.
Why do aircraft fuel metering systems for reciprocating engines have mixture controls?
The air density decreases as the aircraft ascends, causing the mixture to become richer. The mixture control allows the fuel to be decreased to maintain a fuel-air mixture ratio that produces the desired power.
