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CLB page.
4 Thrust Reduction
Condition: airplane has accelerated to the commanded VREF + 98 speed
Result: thrust is automatically reduced from selected takeoff to continuous (CON)
thrust. If the engine failure occurs above the thrust reduction point, the current
climb thrust is maintained.
5 VNAV Climb (Engine Out)
Condition: Selecting the ENG OUT> prompt on the VNAV CLB page displays
applicable engine out performance data. The airline engine out speed (E/O SPD)
may be selected. Execution activates engine out performance data.
Result: the FMC engine out climb function is active, the pitch mode is VNAV
SPD, and CON is the reference thrust limit. A different thrust limit may be
selected on the THRUST LIM page.
VNAV Climb (Engine Out above EO Max Alt)
When the airplane is above the engine out maximum altitude, selection of the
ENG OUT> prompt creates a modification and displays applicable engine out
driftdown (D/D) performance data. Setting the altitude window lower and
executing the modification activates engine out driftdown.
October 1, 2000
747 Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.31.29
Cruise (Engine Out Above EO Max Alt)
1 Engine Out Modification
Condition: Select the ENG OUT> prompt on the VNAV CRZ page.
Engine out cruise phase
LRC SPD
CRZ ALT
FL190
.721
<E/O SPD
ACT E/O CRZ DES
Max Engine Out Altitude, FL235
ACT E/O LRC D/D
LRC SPD
CRZ ALT
FL235
.723
ALL ENG>
ENG OUT>
ACT E/O LRC CRZ
LRC SPD
CRZ ALT
FL235
.723
<E/O SPD ALL ENG>
ALL ENG>
VNAV CRZ
Engine Failure
1
Select ENG OUT FMC commands driftdown
(D/D) descent
2
Subsequent cruise descent
3
4
FL225 FL235
OPT MAX
October 1, 2000
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.31.30 D6-30151-425
Flight Management, Navigation -
Flight Management System
Operation
Result: The FMC creates a modification and displays applicable engine out
driftdown (D/D) performance data.
2 Drift Down Execution
Condition 1: Set the MCP altitude at or below E/O MAX altitude and execute the
FMC modification. This Condition assumes clearance is approved to descend
slowly to an non-standard altitude; for example, FL235.
Result: The autothrottle advances operating engines to CON thrust. VNAV
commands the driftdown and E/O LRC SPD. The E/O MAX altitude becomes the
cruise altitude displayed in 1L. VNAV captures the E/O MAX altitude and
commands engine out LRC cruise. The descent rate is controlled to a minimum of
300 feet per minute (fpm). Time and distance for the D/D to E/O MAX altitude
display at 2R.
Two other ways to activate EO D/D (to the clearance altitude) are discussed below.
Condition 2: Execute the ENG OUT modification. Then, set the clearance altitude
(lower than E/O MAX) in the MCP and push the MCP altitude selector.
Result: Initially, the airplane remains at theMCP altitude, the pitch mode changes
to VNAV ALT, the reference thrust limit is CON, and FMC speed is E/O LRC
SPD. After setting theMCP altutude window and pushing the altitude selector, the
airplane descends in a VNAV driftdown to the clearance altitude in 1L. Initial
descent rate may be greater than Condition 1, depending howmuch airspeed is lost
before pushing the altitude selector. If the airspeed has decreased below E/O LRC
SPD, the descent rate increases to regain the airspeed.
Condition 3: Set the clearance altitude (lower than E/O MAX) in the MCP, push
the altitude selector; then, after the descent is established, execute the FMC
modification (ENG OUT).
Result: After pushing the altitude selector, the airplane descends in a normal
VNAV cruise descent at four–engine economy cruise speed. The thrust limit is
CLB/CRZ and the autothrottle maintains cruise airspeed. Executing the FMC
modification while still above E/O MAX altitude sets the driftdown descent
airspeed to E/O LRC SPD. The reference thrust limit becomes CON. The airplane
initially descends at economy cruise airspeed and approximately 1,250 fpm. After
executing the ENG OUT modification, the commanded airspeed is E/O LRC SPD.
The rate of descent decreases to a minimum of 300 fpm.
3 Engine Out Cruise
Engine out cruise operates like normal cruise with engine out cruise speeds.
Thrust limit remains in CON. VNAV PTH displays as the pitch mode.
October 1, 2000
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