Emergency Procedures

Engine Airstart

The F110-GE-400 engines can be airstarted one by one or both at the same time.

The three possible restart types are: spooldown, cross-bleed or windmill and all three should be attempted in the AFTC selected engine mode. Normally this should be the primary engine mode but if the AFTC has already chosen the secondary mode that should be used for the first attempt.

Spooldown Airstart

The spooldown airstart can be attemped immediately after engine loss before significant spooldown has occured. This is the fastest way to restart an engine.

Depending on engine RPM it might take up to 10 seconds to notice any RPM increase and up to 90 seconds to reach commanded RPM. If the engine mode selected by the AFTC was PRI, a renewed attempt may be made in SEC.

Spooldown Airstart Checklist

  1. Throttle
IDLE or above
If no relight occurs:
  1. Throttle
OFF then IDLE
If still no relight:
  1. ENG MODE SELECT switch
SEC
  1. Throttle
If no start after mode switch, OFF then IDLE
After successful airstart in SEC:
  1. ENG MODE SELECT switch
PRI if possible

Cross-Bleed Airstart

A cross-bleed airstart can be attempted with one engine running if the spooldown airstart was not successfull or the engine is already at or near windmill rpm.

Cross-Bleed Airstart Checklist

  1. Non-running engine throttle
OFF
  1. FUEL SHUT OFF handle
Check handle in in position
  1. Running engine throttle
Minimum 80% RPM
  1. BACK UP IGNITION switch
ON
  1. ENG CRANK switch
Set to non-running engine
  1. Non-running engine throttle
IDLE immediately after ENG CRANK on
If no start occurs:
  1. Non-running engine throttle
OFF then IDLE
If still no start:
  1. ENG MODE select switch
SEC
  1. Non-running engine throttle
OFF then IDLE
After successfull airstart:
  1. BACK UP ignition switch
OFF
  1. ENG MODE SELECT switch
PRI if possible

Windmill Airstart

The windmill airstart uses aircraft airspeed to turn the engine turbines using wind speed. Required airspeed is at or above 450 knots indicated airspeed and should only be attempted if airspeed and altitude allows it.

Windmill Airstart Checklist

  1. Airspeed
At or above 450 KIAS
  1. Throttle
IDLE or above
  1. BACK UP IGNITION switch
ON
If no relight occurs:
  1. Throttle
OFF then IDLE
If still no relight:
  1. ENG MODE SELECT switch
SEC
  1. Throttle
If no start after mode switch, OFF then IDLE
After successful airstart:
  1. BACK UP IGNITION switch
OFF
  1. ENG MODE SELECT switch
PRI if possible