787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Engines, APU -
Engine System Description
Copyright © The Boeing Company. See title page for details.
7.20.6 D615Z003-TBC
[Option – RR engines]
Automatic reversion or manual selection to the alternate mode is indicated by the
EICAS advisory message ENG EEC MODE (L, R) and illumination of the EEC
alternate (ALTN) light on the associated EEC mode switch. Selecting the alternate
mode on both engines eliminates thrust lever stagger at equal thrust settings, or
asymmetric thrust when the thrust levers are operated together.
The autothrottles remain engaged whenever the EEC automatically switches to
the alternate mode. The alternate mode N1 reference/target values are computed
by the FMC.
Note: Autothrottles remain engaged in the soft or hard alternate mode.
The alternate mode schedule (N1 schedule) provides equal or greater thrust than
the normal mode for the same thrust lever position.
TPR
102.4
.21 6
1
N
.21 5
Normal Mode Soft Alternate Mode Hard Alternate Mode
L
NORM
L
ALTN
NORM
L
ALTN
TPR
1
N
.21 5
TPR
EEC mode switch - NORM
EEC mode - Normal
EEC mode switch - NORM
EEC mode - Soft Alternate
EEC mode switch - ALTN
EEC mode - Hard Alternate
1
N
102.4
EICAS Display Format
TPR: Actual
N1: Actual
Commanded
Reference/Target
Maximum
Red Line
EICAS Display Format
TPR: blanks
N1: Actual
Red Line
EICAS Display Format
TPR: blanks
N1: Actual
Commanded
Reference/Target
Maximum
Red Line
.21 5
EEC MODES
August 14, 2009
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