787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Engines, APU -
Engine System Description
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 7.20.11
During autostart, the EEC monitors EGT, N2 RPM and other engine parameters
until the engine reaches idle speed. Oil pressure is monitored by autostart and no
crew action is required during the start. If the EICAS message ENG OIL PRESS
is displayed after engine start, accomplish the ENG OIL PRESS checklist.
During ground starts, the autostart system monitors engine parameters and aborts
the start for any of the following:
• loss of both starters
• no N1 rotation
• no oil pressure rise
If one of the above conditions is detected, the EEC aborts the autostart sequence
without motoring and does not make another attempt. The starters are
de-energized and the START selector returns to the NORM position. The EICAS
caution message ENG AUTOSTART (L or R) displays.
During ground starts, the autostart system monitors engine parameters and
attempts to correct the start for any of the following:
On the ground, if the EEC is unable to correct for a hung start or compressor stall,
the EEC cancels the autostart. Fuel and ignition are shut off and the engine is
motored to clear residual fuel. The starters are de-energized and the START
selector returns to the NORM position. The EICAS caution message ENG
AUTOSTART (L or R) displays. There is a limit of 3 start attempts per start
sequence while on the ground. In the air, the EEC does not limit the start attempts.
Note: For in-flight starts, the autostart system discontinues the start temporarily
only if a preset EGT between the start and takeoff EGT is reached, or a
hung start is detected. Autostart takes corrective action if some start
problems are detected, but does not abort the start.
Autostart
[Option – RR engines]
Autostart allows the EEC to control fuel and ignition. The autostart sequence is
initiated by rotating the START selector to START and moving the FUEL
CONTROL switch to RUN. For in-flight windmill starts the autostart sequence is
initiated by moving the FUEL CONTROL switch to RUN.
• compressor stall
• high residual EGT
• hot start
• hung start
• loss of one starter
• no EGT rise
• start time exceeds the starter
duty cycle timer
February 15, 2010
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