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Performance of a non-normal checklist or sudden engine failure may lead to the
requirement to perform a single engine driftdown.
Engine inoperative cruise information is available from the FMC.
If an engine failure occurs while at cruise altitude, it may be necessary to descend.
The autothrottle should be disconnected, thrust reference set to CON and the
thrust manually set to MCT on the operative engine. On the FMC ACT CRZ page,
select the ENG OUT. This displays MOD CRZ calculated on engine out MCT and
maintaining the airspeed displayed on the EO SPD line.
Set the engine out cruise altitude in the MCP altitude window and execute the
ENG OUT CRZ D/D page. The thrust reference mode on the EICAS display will
display CON. The airplane descends in VNAV using the VNAV SPD pitch mode.
Once the descent rate has decreased to 300 fpm during driftdown it is held
constant by the FMC until altitude capture.
At altitude capture the ENG OUT CRZ page is displayed. Maintain MCT on the
operative engine and driftdown altitude until the E/O SPD speed is established.
Maintain this speed using manual thrust adjustments.
After level off at the target altitude, maintain MCT and allow the airplane to
accelerate to the single engine long range cruise speed. Maintain this speed with
manual thrust adjustments. Entering the new cruise altitude and airspeed on the
ECON CRZ page updates the ETAs and Top of Descent predictions. When the
ENG OUT VNAV mode is selected and an engine-out condition is detected, the
FMC computes engine-out trip predictions, guidance parameters, and MAX ALT
consistent with the detected engine-out conditions, the selected thrust rating using
the actual bleeds. Refer to Engine Out Familiarization, chapter 7, for trim
techniques.
October 31, 2004
767 Flight Crew Training Manual
Climb, Cruise, Descent and
Holding
Copyright © The Boeing Company. See title page for details.
4.12 FCT 767 (TM)
Note: If the airplane is at or below maximum ENG OUT altitude when an engine
becomes inoperative, select and execute the ENG OUT CRZ page.
Maintain engine out cruise speed using manual thrust adjustments.
If required to cruise at maximum altitude, set MCT, establish a climb and
decelerate slowly to ENG OUT CRZ speed. At level off select ENG OUT LRC
for best fuel economy.
An alternate target driftdown speed can be selected using the MOD CRZ or ENG
OUT D/D page. LRC speed would result in a lower driftdown altitude but better
fuel performance. A company specified speed could be selected and provides for
a higher driftdown speed and a shorter flight time to the alternate.
An ENG OUT ALT can be entered on the MOD CRZ or ENG OUT D/D page. If
an engine out cruise altitude lower than the computed maximum altitude is
entered, the FMC commands a cruise descent at approximately 1250 fpm rather
than a driftdown schedule.
Unless altered by the pilot, the level off cruise mode will be the same as was used
during driftdown. FMC fuel and ETA calculations for driftdown and the
remainder of the trip will be consistent with the selected speed mode. For best fuel
performance select the engine-out LRC mode following a minimum drag speed
(E/O) driftdown.
When VNAV is not used during engine out, set MCT on the operative engine and
maintain altitude until the airplane decelerates to the displayed appropriate engine
out speed. Use engine out speed from the FMC while descending to the engine out
cruise altitude. Remain at MCT until the airplane accelerates to LRC, then
maintain LRC speed with manual thrust adjustments. If the FMC is inoperative
use turbulence penetration airspeed to driftdown and the engine out long-range
cruise tables in the QRH.
•
•
•
• • •
• Disconnect
autothrottle
• Select CON
thrust limit
• Manually set
to MCT
• Select ENG OUT CRZ
• Set engine out altitude on
MCP
• Slow to ENG OUT airspeed
• Select VNAV
• Notify ATC
• Initiate turn
with HDG SEL
(if required)
• Non-normal checklist
• Determine course
of action
Engine
failure
October 31, 2004
767 Flight Crew Training Manual
Climb, Cruise, Descent and
Holding
Copyright © The Boeing Company. See title page for details.
FCT 767 (TM) 4.13
High Altitude High Speed Flight
The airplane exhibits excellent stability throughout the high altitude / high Mach
range. Mach buffet is not normally encountered at high Mach cruise. The airplane
does not have a Mach tuck tendency.
With Mach trim inoperative, the airplane exhibits a neutral trim change when
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767机组训练手册Flight Crew Training Manual (FCTM)767(52)
