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SPD line.
Set the engine out cruise altitude in the MCP altitude window and execute the EO
D/D page. Thrust reference changes to CON and the autothrottle maintains MCT.
The airplane descends in VNAV using the VNAV SPD pitch mode. The VNAV
SPD mode may command the airplane to nearly level flight to control an airspeed
increase above the driftdown target speed. If the excess airspeed cannot be
reduced with the airplane in nearly level flight, then the FMC transitions to the
VNAV PTH mode. In the VNAV PTH mode, the FMC commands a flight path for
a 300 fpm descent rate. The autothrottle SPD mode then controls the airspeed.
At altitude capture the ENG OUT CRZ page is displayed. Maintain MCT and
driftdown altitude until the EO SPD speed is established.
Note: If the airplane is at or below maximum engine out altitude when an engine
becomes inoperative, select and execute the EO CRZ page and maintain
engine out cruise speed.
If required to cruise at maximum altitude, set MCT and establish a climb,
decelerating slowly to EO CLB speed. At level off select EO LRC for best fuel
economy.
•
•
•
• •
• Select ENG OUT CRZ
• Set engine out altitude on MCP
• Airplane descends in VNAV
SPD and slows to EO airspeed
• Notify ATC
• Initiate turn with
HDG/TRK SEL
(if required)
• Non-normal checklist
• Determine course
of action
Engine
failure
October 31, 2006
777/787 Flight Crew Training Manual
Climb, Cruise, Descent and
Holding
Copyright © The Boeing Company. See title page for details.
4.14 FCT 777/787 Preliminary (TM)
An alternate target driftdown speed can be selected using the MOD CRZ or EO
D/D page. LRC speed would result in a lower driftdown altitude but better fuel
performance. A company speed (CO SPD) could be selected, as specified in the
AMI (Airline Modifiable Information file) and provides for a higher driftdown
speed and a shorter flight time to the alternate.
An engine out cruise altitude can be entered on the MOD CRZ or EO D/D page.
If an engine out cruise altitude is entered while the airplane is more than 150 feet
above the computed maximum altitude, the FMC commands a driftdown schedule
for descent to the entered engine out cruise altitude. If a cruise altitude is entered
after the airplane has descended to within 150 feet of the computed maximum
altitude or to a lower altitude, the FMC commands a cruise descent at
approximately 1,250 fpm for descent to a lower engine out cruise altitude.
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 the driftdown and
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. If the FMC is inoperative use turbulence penetration
airspeed to driftdown and the engine out long-range cruise tables in the QRH.
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.
As speed nears MMO, drag increases rapidly. At high weights, sufficient thrust
may not be available to accelerate to MMO in level flight at normal cruising
altitudes.
ETOPS
Extended Range Operation with Two Engine Airplanes (ETOPS) are those flights
which include points at a flying distance greater than one hour (in still air) single
engine cruise speed from an adequate airport. Improved technology and the
increased reliability of two engine airplanes has prompted a re-examination of the
rules governing their flights over oceans or desolate areas.
October 31, 2006
777/787 Flight Crew Training Manual
Climb, Cruise, Descent and
Holding
Copyright © The Boeing Company. See title page for details.
FCT 777/787 Preliminary (TM) 4.15
ETOPS Requirements and Approval
Operators conducting ETOPS are required to comply with the provisions of FAA
Advisory Circular 120-42A or other applicable governing regulations. An
operator must have an ETOPS configured airplane, and approved flight operations
　
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