Aircraft Maintenance Engine & System Repairs Flashcards
7 cards from real AM practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Aircraft Maintenance Engine & System Repairs flashcards as text
Hydraulic fluid is found contaminated with engine oil in an aircraft system. The correct maintenance action is:
Answer: Flush the entire hydraulic system and replace all seals
Cross-contamination of hydraulic fluid with engine oil requires a complete system flush and seal replacement because petroleum oil degrades MIL-PRF-5606 or Skydrol seals.
Which NDT method is most effective for detecting subsurface fatigue cracks in aluminum aircraft structures?
Answer: Eddy current inspection
Eddy current inspection detects subsurface cracks in non-ferrous materials like aluminum without requiring the surface to be bare metal.
When replacing a fuel control unit (FCU) on a turboprop engine, the first step after installation is to:
Answer: Calibrate the FCU to the engine using trimming procedures
After FCU replacement, the unit must be calibrated to the specific engine through the manufacturer's trimming procedure before any engine run.
An aircraft piston engine develops excessive blow-by past the piston rings. This condition is most reliably detected by:
Answer: Differential compression test
A differential compression test directly measures the ability of each cylinder to hold pressure, identifying worn or damaged rings causing blow-by.
The purpose of compressor washing on a turbine engine is primarily to:
Answer: Restore lost performance caused by compressor fouling
Compressor washing removes salt, dust, and contamination fouling the blades to restore aerodynamic efficiency and lost thrust or power.
During engine teardown, a turbine blade is found with tip rub marks. Per typical maintenance manuals, this blade should be:
Answer: Replaced if rub depth exceeds the serviceable limit
Tip rub is evaluated against published serviceable limits; blades within limits may be returned to service, but those exceeding limits must be replaced.
What is the primary reason for performing a borescope inspection of a turbine engine between overhauls?
Answer: To assess internal hot section condition without disassembly
Borescope inspections allow technicians to visually assess turbine blades, combustors, and nozzle vanes for cracks, erosion, or distress without engine removal or teardown.