Emergency Procedures

Engine Air-start

The F110-GE-400 engines can be air-started one-by-one or simultaneously.
Three restart methods are available:

  • Spool-down
  • Cross-Bleed
  • Windmill

All attempts should be made in the engine mode selected by the AFTC (normally PRI, or SEC if PRI fails).

Spool-down Air-start

Spool-down air-start should be attempted immediately after engine loss, before significant spool-down occurs.

  • May take up to 10 seconds for RPM increase and 90 seconds to reach commanded RPM.
  • If PRI fails, retry in SEC.

Spool-down Air-start Checklist

StepItemAction
1ThrottleIDLE or above
2If no relight: ThrottleOFF then IDLE
3ENG MODE SELECT switchSEC
4ThrottleIf no start after mode switch: OFF then IDLE
5After successful startSet ENG MODE SELECT to PRI if possible

Cross-Bleed Air-start

Use if:

  • Spool-down failed
  • One engine is already running
  • Target engine is near windmill RPM

Cross-Bleed Air-start Checklist

StepItemAction
1Non-running throttleOFF
2FUEL SHUT OFF handleVerify handle IN
3Running engine throttleMinimum 80% RPM
4BACK UP IGNITION switchON
5ENG CRANK switchSet to non-running engine
6Non-running throttleIDLE immediately after CRANK
7If no start: ThrottleOFF then IDLE
8ENG MODE SELECT switchSEC
9ThrottleOFF then IDLE
10After successful startBACK UP IGNITION: OFF
11ENG MODE SELECT switchPRI if possible

Windmill Air-start

Used when:

  • Airspeed ≥ 450 KIAS
  • Altitude permits sufficient airflow through engine

Windmill Air-start Checklist

StepItemAction
1AirspeedAt or above 450 KIAS
2ThrottleIDLE or above
3BACK UP IGNITION switchON
4If no relight: ThrottleOFF then IDLE
5ENG MODE SELECT switchSEC
6ThrottleOFF then IDLE
7After successful startBACK UP IGNITION: OFF
8ENG MODE SELECT switchPRI if possible