FREE A&P Turbine Engine Maintenance Questions and Answers

Question 1

A technician performing a borescope inspection on a high-bypass turbofan engine discovers several small, smooth-surfaced dents on the leading edges of multiple first-stage compressor blades.
What is the most likely cause of this specific type of damage?

Accepted Answer

Soft body Foreign Object Damage (FOD)

Answer

Normal operational erosion

Answer

Compressor stall or surge events

Answer

Fatigue cracking due to excessive vibration

Question 2

Which of the following describes the primary long-term effect of operating a turbine engine at or near its maximum temperature limits, which leads to the permanent elongation of turbine blades?

Accepted Answer

Creep

Answer

Galling

Answer

Spalling

Answer

Brinelling

Question 3

What is the primary purpose of performing a routine compressor wash on a turbine engine?

Accepted Answer

To remove contaminants from airfoils to restore engine performance

Answer

To provide lubrication to the compressor stator vane mechanism

Answer

To cool the hot section prior to a borescope inspection

Answer

To check the integrity of blade coatings and seals

Question 4

During a hot section inspection, an A&P technician identifies thermal cracking on several first-stage turbine nozzle guide vanes. What is the most common cause for this type of failure?

Accepted Answer

Frequent and rapid thermal cycling

Answer

Fuel contamination with water

Answer

A prolonged engine over-speed condition

Answer

Excessive vibration from the low-pressure turbine

Question 5

After replacing a fuel control unit on a turbofan engine, the maintenance manual calls for an engine trim check. What is the primary objective of this procedure?

Accepted Answer

To adjust the fuel control to ensure the engine produces rated thrust at specified limits

Answer

To verify the proper operation of the ignition system exciters

Answer

To balance the main rotating assemblies of the N1 and N2 spools

Answer

To align the engine mounts with the pylon attachment points

Question 6

A technician is approved to perform a minor repair on a small nick in a compressor blade by blending. Which of the following is a critical requirement for a successful blending repair?

Accepted Answer

The repair must have smooth, generous radii to prevent stress concentrations.

Answer

The repair area must be polished to a mirror finish to reduce friction.

Answer

A minimum amount of material should be removed, leaving sharp edges to cut the air cleanly.

Answer

The blade's weight must be increased slightly to counteract the removal of material.

A technician performing a borescope inspection on a high-bypass turbofan engine discovers several small, smooth-surfaced dents on the leading edges of multiple first-stage compressor blades.What is the most likely cause of this specific type of damage?

A technician performing a borescope inspection on a high-bypass turbofan engine discovers several small, smooth-surfaced dents on the leading edges of multiple first-stage compressor blades.
What is the most likely cause of this specific type of damage?