engine management Flashcards
what 6 things do we need to check before start?
- is fuel and oil ok?
- is the battery ok? APU if available
- are controls and switches properly set?
- is the intake and exhaust clear?
- is the prop on start locks?
- does the prop pull through smoothly?
what 4 things happen during start at less than 10% RPM?
- battery/apu provides power to starter
- air flow purges engine
- oil vent valve opens
(4) . Torque/temp limiter is off
what 5 things happen as the engine ignites at 10% RPM?
- fuel and ignition turned on
- fuel shutoff valve opens
- fuel enrich on
- anti-ice lockout closes
- turbine power assists acceleration
what happens as the engine accelerates past 10% RPM?
compressor pressure is sensed at the FCU to make fuel flow rise with airflow
what 8 things happen as the engine reaches 55% RPM during start?
- compressor pressure is sensed at the FCU to make fuel flow rise with airflow
- the engine reaches self-sustaining engine speed
- ignition off
- starter-generator off
- oil vent valve closed
- fuel enrich off
- anti-ice lockout valve open
- torque/temperature limiter on
what 2 things happen at ground idle (70%)?
- USFG controls fuel flow
2. engine reaches selected speed and USFG governor cuts fuel flow to maintain RPM
how are the start locks released?
- power leaver moved to reverse
- pitch control routes oil to prop
- prop blades move toward reverse
- start locks release
what happens when we move the power lever forward in beta mode?
- pitch control dumps prop oil
- prop blades move to forward pitch, providing positive thrust for taxiing
- USFG responds with increased fuel flow
what happens in then engine at takeoff?
- power lever advanced to torque/temp limit
- fuel control meters selected fuel
- prop governor routes oil to/from prop in response to RPM variations
- prop blade angles vary to match load to engine power
what happens in the engine during cruise?
- power lever retarded to reduce fuel flow
- speed lever is retarded
- prop governor is reduced in setting
- prop increases blade angle, increasing torque load and decreasing noise
what happens in the engine after landing?
- power lever moved to reverse
- pitch control routes oil to prop
- prop blades rotate to provide negative thrust, loading engine
- USFG governor adds fuel to increase power, balancing higher load