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to 9,000 feet below the current CRZ ALT and up to less than MAX altitude.
Recommended altitudes are selected consistent with the step climb schedule and
specified step size. If a step size of zero has been selected, the recommended
cruise level is selected assuming a 2,000 foot step size. The recommended altitude
is set to the CRZ ALT when within 500 nm of the T/D.
Note: The recommended altitude may be above or below cruise altitude. Refer to
RTE DATA and WIND pages for wind and temperature data.
For RTA CRZ mode active: OPT, MAX, and RECMD are not computed. OPT,
MAX, and RECMD headers are blank.
Constant Speed Cruise
A speed for a cruise segment can be specified. A cruise segment has a start
waypoint and an end waypoint. The airplane maintains a constant speed between
the two waypoints. The waypoints must be in the cruise phase. The FMC controls
the speed after the end waypoint or top of descent.
Modification must be executed.
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Cruise
Boeing Proprietary 11.42.29
The constant speed cruise starts at BTG at .800 Mach. Entry is in Mach.
The constant speed cruise ends at OAK then ECON speed is used. If an RTA
waypoint exists at RBL or OAK, the RTA is deleted.
Entry can be a Mach number, ECON/ or E/, LRC/ or L/. If an RTA waypoint is in
the flight plan, RTA/ or R/ may be entered.
If no end waypoint is specified, the constant speed terminates at top of descent.
The FMC may select the end waypoint if an RTA waypoint is entered. The FMC
selects the end waypoint to allow enough distance to arrive at the RTA waypoint
on time. In the example, if the FMC selected OAK as the end waypoint, RTA
would replace ECON. See RTA PROGRESS page 3/4.
1 Start Waypoint for Constant Speed Cruise
2 End Waypoint for Constant Speed Cruise
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
EC O N/
0 8
0 8
0
0
.8 /FL350
.8 /FL350
.8 0/FL350
3 8
3 3
2
6 5
2 9
AVE
OAK
RBL
DERBB
9
2 1
6 2
5 6
5
B
RTE DATA>
.8 0/FL350
N M
1 NM
14 NM
1 4
ERASE
TG
1 2 o
1 o
1 o
1 6 o
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F L 3 5 0
w8mt-34-00-0073
M.800
START
BTG
ECON RBL
END
OAK
M.800 AVE
DERBB
ECON
1
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787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Cruise
11.42.30 Boeing Proprietary
Cruise Descent
Setting an altitude below the current altitude in the MCP altitude window and
pushing the altitude selector (more than 50 nm from a T/D) causes the cruise
altitude to be set to the MCP altitude and the airplane to descend to the new
altitude. The CRZ page displays ACT ECON CRZ DES. If the altitude set in the
altitude window is below the speed transition (SPD TRANS) or restriction (SPD
RESTR) altitude displayed on the DES page, those altitudes and speeds are
deleted. Transition or speed restrictions must be maintained by flight crew action.
The autothrottle sets a calculated thrust value for an approximate 1250 foot per
minute descent. Pitch changes maintain the commanded cruise speed. Thrust
levers can be manually positioned to adjust the descent rate.
VNAV page title displays cruise phase in a descent to a new cruise altitude.
VNAV page title displays cruise phase after level off at new cruise altitude.
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.
1 During Cruise Descent
2 End of Cruise Descent
ACT ECON CRZ DES 2/3
ACT ECON CRZ 2/3
w8mt-34-00-0068
1
2
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Cruise
Boeing Proprietary 11.42.31
The DES NOW prompt is shown on the descent page when the cruise phase is
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787机组操作手册Flight Crew Operations Manual 3(70)
