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Operation
11.31.30 Boeing Proprietary
Takeoff and Climb (Engine Out)
Condition: before a sensed engine failure and above VNAV activation altitude.
Result: VNAV SPD commands a climb at V2+15 to V2+25 knots. Autothrottle
annunciation is THR REF and the thrust limit is takeoff.
1 Takeoff SELECT AND
EXECUTE ENG OUT
ACTUAL SPEED REACHES
VREF + 80 AUTOMATIC CHANGE
FROM TAKEOFF THRUST LIMIT
TO CONTINUOUS (CON) THRUST
LIMIT
FMC MAINTAINS TAKEOFF
THRUST AND SPEED
V2 TO V2 + 25
V2 + 15 TO V2 + 25
EO ACCELERATION HEIGHT OR FIRST
MOVEMENT OF FLAP HANDLE
SENSED ENGINE FAILURE
VNAV ACTIVATES (400 FT ABOVE RUNWAY)
400 FT
NOTE: VNAV PAGE TITLE MAY BE
LIM SPD CLB WHEN TARGET
SPEED IS LIMITED BY FLAP
PLACARD SPEED.
ACT EO CLB
FL250
223
<ALL ENG
CRZ ALT
EO SPD
ACT VREF + 80 CLB
FL250
250
<ALL ENG ENG OUT>
CRZ ALT
SEL SPD
ENG OUT>
EO SID
LOADED
AUTOMATICALLY
1
2
5
4
6
3
787 Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
Boeing Proprietary 11.31.31
Condition: after VNAV activation, engine failure is sensed, airplane below engine
out acceleration height and below the thrust reduction point entered on the
TAKEOFF REF page.
Result: VNAV remains in VNAV SPD and commands a speed of V2 to V2 + 15.
Autothrottle remains in THR REF and the thrust limit remains takeoff (TO).
Condition: flaps out of UP and an engine out standard instrument departure (EO
SID) is in the FMC database.
Result: the FMC loads the EO SID as a flight plan modification. The modification
may be either executed or erased.
Condition: at acceleration height or flap retraction has started.
Result: VNAV commands an acceleration to VREF + 80, limited by the airplane
configuration (flap placard). Pushing the VNAV function key displays the ACT
VREF + 80 CLB page.
Condition: airplane has accelerated to the commanded VREF + 80 speed.
Result: thrust is automatically reduced from TO to continuous (CON) thrust. If the
engine failure occurs above the thrust reduction point, the current climb thrust is
maintained.
Condition: Select the ENG OUT> prompt on the VNAV CLB page to display the
applicable engine out performance data. The airline company engine out company
speed (CO SPD) or long range cruise (LRC) speed may be selected. Execute to
make the data active.
Result: the FMC engine out climb function is active, VNAV is in VNAV SPD,
CON thrust is selected, if not previously selected. A different thrust limit may be
selected on the THRUST LIM page.
Climb (Engine Out above EO Max Alt)
When the airplane is above the engine out maximum altitude, selection of the
ENG OUT> prompt on the VNAV CLB page 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. Execution of the modification
activates the engine out driftdown function.
2 Sensed Engine Failure
3 EO SID
4 Acceleration Height
5 Thrust Reduction
6 VNAV Climb (Engine Out)
787 Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
11.31.32 Boeing Proprietary
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>
　
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