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¶

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

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

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