787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Flight Management, Navigation -
FMC Cruise
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 11.42.33
Early Descent
An early descent is a descent started prior to the T/D. The VNAV descent page
becomes active.
During cruise, setting an altitude below the current altitude in the MCP altitude
window and pushing the altitude selector activates the DES NOW function when
the airplane is within 50 NM of the T/D or if the MCP altitude is set below the
highest descent altitude constraint in the VNAV descent profile.
The autothrottle sets thrust to maintain the target descent rate; then annunciates
HOLD. Pitch maintains the commanded speed. Thrust levers can be manually
positioned to adjust the descent rate.
Another method to accomplish an early descent: set a lower MCP altitude, page
forward to the VNAV DES page and line select DES NOW, and execute.
The DES NOW prompt is shown on the descent page when the cruise phase is
active. Select the DES NOW prompt and execute to start a VNAV ECON descent
of approximately 1250 feet per minute at ECON speed.
Upon reaching the planned descent path, VNAV commands pitch to maintain the
planned descent path and ECON speed. If the airplane reaches an altitude
constraint, VNAV changes to VNAV ALT until the planned descent path is
intercepted.
1
Descend Now (DES NOW)
<
3/3
>WONSED
SEDNOCE
SEDHTAPFFO
1
October 31, 2007
To Next Page
Loading...
