787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Flight Management, Navigation -
Flight Management System
Operation
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 11.31.35
Cruise (Engine Out Above EO Max Alt)
Selection of ENG OUT> may also be accomplished on the XXXX ALTN page in
conjunction with a diversion modification.
Condition: Select the ENG OUT> prompt on the VNAV CRZ page.
Result: The FMC creates a modification and displays the applicable engine out
driftdown (D/D) performance data to enable the airplane to descend to the engine
out maximum altitude.
Condition 1: Set the MCP altitude at or below EO MAX altitude and execute the
FMC modification. This condition assumes clearance is approved to descend
slowly to a non–standard altitude; for example, FL233.
Result: The reference thrust limit becomes CON, VNAV commands a very
shallow descent in VNAV SPD as the airplane decelerates to EO SPD, the EO
MAX altitude becomes the cruise altitude at 1L, and the autothrottle sets CON
thrust on the operative engine. Time and distance for the D/D to EO MAX altitude
display at 2R.
Two other ways to activate the EO D/D (to the clearance altitude) are discussed
below.
1
Engine Out Modification
2
Drift Down Execution
FMC commands driftdown
(D/D) descent
ACT EO CRZ
FL233
232
<CO SPD
ALL ENG>
CRZ ALT
SEL SPD
LRC>
FL217 FL233 FL210
OPT MAX RECMD
ACT EO D/D
FL233
232
<CO SPD
ALL ENG>
CRZ ALT
EO SPD
LRC>
FL217 FL233 FL210
OPT MAX RECMD
VNAV CRZ
Engine
Failure
Max Engine Out Altitude, FL233
Subsequent cruise descent
Engine out cruise
Select ENG OUT
ACT EO D/D
FL233
232
<CO SPD
ALL ENG>
CRZ ALT
EO SPD
LRC>
FL217 FL233 FL210
OPT MAX RECMD
ACT EO CRZ DES
12000
232
<CO SPD ALL ENG>
CRZ ALT
EO SPD
LRC>
1
3
4
2
ENG OUT>
August 14, 2009
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