787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Engines, APU -
Engine System Description
Copyright © The Boeing Company. See title page for details.
7.20.14 D615Z003-TBC
If a sub-idle stall is detected, fuel is shut off for one second in an attempt to clear
the stall. The fuel schedule is then reduced to help return the engine to idle. The
fuel schedule returns to normal when the engine again reaches idle.
The EEC also provides protection against flameout during periods of excessive
rain/hail ingestion. When a flameout is detected, the EEC energizes both ignitors.
Auto–Relight
[Option – RR engines]
Engine auto-relight protection is provided for flameout and sub-idle stall recovery.
There is no manual continuous ignition selection or automatic continuous ignition
function. The auto-relight function is activated whenever a flameout is detected,
or an engine is at or below idle with the FUEL CONTROL switch in RUN.
When the auto-relight function is activated, the EEC commands both ignitors in
the respective engine to on in an attempt to recover the engine. The ignitors are
switched off when the engine again reaches idle.
The EEC also provides protection against flameout during periods of excessive
rain/hail ingestion. When a flameout is detected, the EEC energizes both ignitors.
February 15, 2010
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