A&P Turbine Engine Systems Inspection Questions and Answers

Question 1

A technician performing a borescope inspection on a turbine engine's hot section observes small, pitted, and corroded-looking areas on the turbine blades, a condition not consistent with impact damage.
This type of high-temperature corrosion, often found in engines operating in salt-laden or industrial environments, is known as what?

Accepted Answer

Sulfidation

Answer

Foreign Object Damage (FOD)

Answer

Creep

Answer

Thermal Fatigue

Question 2

During a routine inspection of a turbine engine's compressor section, a small nick is found on the leading edge of a blade. What is the generally accepted repair method for this type of minor damage, provided it is within the limits specified by the engine maintenance manual?

Accepted Answer

Blending the damaged area smooth with a fine file or stone.

Answer

Welding the damaged area with a compatible alloy.

Answer

Stop-drilling both ends of the nick to prevent cracking.

Answer

Replacing the entire compressor stage.

Question 3

Which of the following non-destructive inspection (NDI) methods is most effective for detecting minute surface and near-subsurface cracks in a conductive turbine engine component, such as a turbine disk, often without requiring its complete removal from the engine?

Accepted Answer

Eddy Current Inspection

Answer

Borescope Inspection

Answer

Tap Testing

Answer

Magnetic Particle Inspection

Question 4

A technician inspects a magnetic chip detector from a turbofan engine's oil system and finds a small quantity of fine, fuzzy metallic particles. What is the most appropriate first course of action?

Accepted Answer

Consult the engine maintenance manual for specific criteria on particle analysis.

Answer

Immediately ground the aircraft and schedule the engine for overhaul.

Answer

Drain the oil system and flush it with an approved solvent.

Answer

Clean the chip detector, reinstall it, and perform an engine ground run.

Question 5

What is the primary operational limit that the Exhaust Gas Temperature (EGT) indicating system is designed to protect?

Accepted Answer

Turbine inlet temperature limits.

Answer

Compressor stall margin.

Answer

Maximum fuel flow pressure.

Answer

Accessory gearbox oil temperature.

Question 6

During a borescope inspection of a combustor can, a technician observes a significant buildup of hard carbon deposits on a fuel nozzle tip, a condition known as coking. Which of the following is the most likely result of this condition?

Accepted Answer

A distorted fuel spray pattern causing localized hot spots.

Answer

A uniform decrease in engine operating temperature.

Answer

An increase in the engine's overall compression ratio.

Answer

Improved fuel atomization and combustion efficiency.