Quiz4 Flashcards
(30 cards)
What types of NDT can be used on turbine engine inspections?
Magnetic particle, eddy current, dye penetrant, radio graphic.
What are the methods of inspection for engine overhaul?
Visual, NDT, measurement,
What should be inspected in the inlet duct?
Cracks and erosion. This is a line maintenance function.
What is the compressor section inspected for visually? Dye pen? Measurement?
Erosion, cracks, FOD, rub, and galling.
Vanes and blades, mag particle-disks, measurement, chord, creep, twist and bow.
What must the combustion section be checked for?
Cracks, warping, scorching, hot spots, shifted burner.
Why is the turbine section critical?
High temps!
What is primary creep?
Initial, normal growth of a new blade.
What is secondary creep?
Slow, normal growth of a blade over time.
What is tertiary creep?
Accelerated growth after overtemp.
How do you inspect the exhaust section?
The same inspection as the combustion section.
How to inspect turbine section?
Visually, for cracks, burns and erosion.
Dyepen, for stress rupture cracks.
Measurement, for creep twist and bow.
How may cracks in the combustion section be repaired?
By welding.
How may worn combustion liners be restored?
With ceramic or plasma coatings.
How is minor FOD in the stator rotor blades repaired?
By blending, must keep original contour.
What must be done when there is major damage to a rotor/stator?
The component must be removed.
What must be done when there is a major repair to a rotor?
It must be balanced.
When must electron beam welding be done?
When non converging compressor stators/rotors are minorly cracked.
What does the repair of the inlet depend upon?
The type of compressor inlet material
What are different types of compressor inlet materials?
Sheet metal, composite, aluminum or magnesium casting.
How is minor erosion in compressor/stator rotor blades removed?
Crocus cloth!
How are an odd number of blades replaced?
120 degrees apart for three blades
What is the final balance of a reassembled engine called?
Dynamic balance
What is the balancing of the compressor and turbine wheels called?
Static balancing
What is an important step in engine reassembly?
Carefully follow the engine manufacturers overhaul manual
