Cahpter 16: Engine Monitoring Ground Operation Flashcards
safety precaution areas of engine
1) air intake (suction)
2) exhaust (temp., velocity, toxicity, noise)
3) hot engine parts
4) fuel & oil
5) ignition
6) compressor bleed valves
which areas do enigne borescopic inspection check on?
compressor blades
combustor
compressor-turbine blades
compressor-turbine vanes
free turbine blades
what does engine borescopic inspection check for?
1) damage on blades/vanes from FOD or corrosion
2) burn marks, cracks
types of contaminants that enters the compressor
1) dirt
2) oil vapours
3) soot
4) exhaust fumes
5) salt
what can be improved after a compressor wash?
1) TIT (down)
2) compressor inlet temp. (down)
3) burner efficiency
4) compression ratio
5) efficiency of compressor & turbine
procedures for engine starting and ground run
1) leak check on pneumatic, fuel, oil system
2) vibration tests to trim mass and location
3) availability of power
4) availability of IDG power
5) engine acceleration test
engine operation limits
1) N1 N2 overspeed
2) EGT
what is dry motoring?
supplies fuel to fuel pump but not to combustion chamber (no fuel comes out of FCU)
what is wet motoring?
supplies fuel to fuel pump, combustion chamber and fuel servo pressure components, but with no ignition in chamber
tests carried out for engine certification
1) fan blade out
2) bird / water ingestion
3) triple redline (EGT, N1, N2, oil temp.)
4) high altitude start
5) cold start
what information is on the engine data plate?
1) builder name
2) model designation
3) builder serial number
3) type cert number
4) product cert number
what components are driven by the accessory gearbox?
1) LP/HP fuel pump
2) oil pump
3) starter motor
4) hydraulic pump
5) IDG
6) centrifugal breather
why is engine borescopic inspection used?
no need to disassemble engine to check combustor
