Reciprocating Engines/Turbine Engines/Engine Inspection
Recip: What are some indications of induction system leakage?
Low power and uneven running.
Engine Instruments: On a turbine engine, what does exhaust gas temperature (EGT) indicate and how is it obtained?
EGT is the average temperature of the turbine discharge gases and is obtained by thermocouples placed near the turbine exit.
Lubrification: What function does an oil cooler by-pass valve perform?
It directs the oil either through the cooler or around it in order to maintain proper operating oil temperatures.
Engine Fuel: Why is vapor lock serious?
The fuel flow may be completely blocked.
Exhaust & Reverser: What is the primary function of an exhaust system (in regards to safety)?
To provide protection against the potential destructive action of exhaust gases.
Turbine: What methods are commonly use to accomplish turbine engine compressor field cleaning?
Fluid flush and abrasive grit blast.
Engine Fire Protections: What is the proper method for determining the fire extinguisher container pressure?
Container gauge pressure used with pressure-temperature curve/chart will indicate if the pressure is within limits.
Ignition & Starting: Which magneto is grounded when the magneto switch is selected to the right magneto?
The left magneto circuit.
Engine Airflow: How and at what point does an internally drive supercharger boost air pressure?
An (engine-driven) impeller compresses the fuel/air mixture after it leaves the carburetor.
Propellers: What is the ALPHA range of turboprop?
ALPHA - Operates in the standard constant speed mode (which is usually in flight).
Engine Inspection: What functions need to be accomplished in order to prepare an engine for a 100 hour inspection?
Remove the cowling and clean.
Engine Electricals: How are wire sized represented?
By a numbered gauge size. The smaller wires are represented by larger numbers. The smallest size wire normally used in aircraft is 22-gauge.
Fuel Metering: What is the RPM indication 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.
Engine Cooling: What are the functions of engine cowling?
It streamlines the engine area to reduce drag and it forms an envelope around the engine to aid in controlling cooling airflow.
Turbine Powered Auxiliary Power Unit: Name at least two uses for APU produced pneumatic power.
Engine Starting, Ground Air Conditioning, and/or Anti-icing.
Engine Inspection: What publication is needed to inspect an engine for conformity with specifications?
Engine Electricals: What DC alternator system component presents battery reverse-current flow into the armature?
The rectifier.
Ignition & Starting: What is the main concern when preparing a magneto for installation?
Internal Timing.
Engine Airflow: When is carburetor throttle ice most likely to form due to throttle position?
During part throttle operation when the throttle is in a partly closed position.
Turbine Powered Auxiliary Power Unit: What is the operating effect of following a required cool-down period?
The APU's EGT is lowered and stabilized.
Engine Inspection: What publication is needed to check an engine for normal operation?
The engine's maintenance manual.
Engine Instruments: What is the possible cause when a turboprop engine oil pressure drops off severely and the oil supply remains full?
Oil pressure transmitter or indicator malfunction.
Fuel Metering: When does a carburetor economizer system needle valve begin to open?
Above approximately 60 - 70% of rated power.
Engine Cooling: What areas of a turbine engine are cooled by air passing through the engine?
The combustion chamber and turbine.
Propellers: Other than maintaining constant speed, what are two actions of some controllable propellers?
Reverse pitch and feathering.