engine management

Question 1

what 6 things do we need to check before start?

Answer 1

1. is fuel and oil ok?
2. is the battery ok? APU if available
3. are controls and switches properly set?
4. is the intake and exhaust clear?
5. is the prop on start locks?
6. does the prop pull through smoothly?

Question 2

what 4 things happen during start at less than 10% RPM?

Answer 2

1. battery/apu provides power to starter
2. air flow purges engine
3. oil vent valve opens
   (4) . Torque/temp limiter is off

Question 3

what 5 things happen as the engine ignites at 10% RPM?

Answer 3

1. fuel and ignition turned on
2. fuel shutoff valve opens
3. fuel enrich on
4. anti-ice lockout closes
5. turbine power assists acceleration

Question 4

what happens as the engine accelerates past 10% RPM?

Answer 4

compressor pressure is sensed at the FCU to make fuel flow rise with airflow

Question 5

what 8 things happen as the engine reaches 55% RPM during start?

Answer 5

1. compressor pressure is sensed at the FCU to make fuel flow rise with airflow
2. the engine reaches self-sustaining engine speed
3. ignition off
4. starter-generator off
5. oil vent valve closed
6. fuel enrich off
7. anti-ice lockout valve open
8. torque/temperature limiter on

Question 6

what 2 things happen at ground idle (70%)?

Answer 6

1. USFG controls fuel flow

2. engine reaches selected speed and USFG governor cuts fuel flow to maintain RPM

Question 7

how are the start locks released?

Answer 7

1. power leaver moved to reverse
2. pitch control routes oil to prop
3. prop blades move toward reverse
4. start locks release

Question 8

what happens when we move the power lever forward in beta mode?

Answer 8

1. pitch control dumps prop oil
2. prop blades move to forward pitch, providing positive thrust for taxiing
3. USFG responds with increased fuel flow

Question 9

what happens in then engine at takeoff?

Answer 9

1. power lever advanced to torque/temp limit
2. fuel control meters selected fuel
3. prop governor routes oil to/from prop in response to RPM variations
4. prop blade angles vary to match load to engine power

Question 10

what happens in the engine during cruise?

Answer 10

1. power lever retarded to reduce fuel flow
2. speed lever is retarded
3. prop governor is reduced in setting
4. prop increases blade angle, increasing torque load and decreasing noise

Question 11

what happens in the engine after landing?

Answer 11

1. power lever moved to reverse
2. pitch control routes oil to prop
3. prop blades rotate to provide negative thrust, loading engine
4. USFG governor adds fuel to increase power, balancing higher load