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OPT – displays the optimum altitude based on airplane gross weight and speed
displayed on the speed line.
MAX – displays the maximum cruise altitude based on:
• current gross weight
• engine out operation
• selected speed option
• disregarding any altitude or speed constraints, and
• residual climb rate of 100 feet per minute.
RECMD – displays the most economical altitude to fly based on airplane gross
weight and cruise winds.
2 Cruise Altitude (CRZ ALT)
3 Engine Out Speed (EO SPD)
4 Company Speed (CO SPD)
5 Engine Out (EO SPD)
6 Optimum Altitude, Maximum Altitude, and Recommended Altitude
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Cruise
Boeing Proprietary 11.42.23
Push – displays a MOD XXX CRZ page with performance based on both engines
operating.
Selection and execution allows subsequent selection of two engine economy
VNAV modes.
Push – enables execution of engine out long range cruise.
Displayed when EO, CO SPD or SEL SPD is the active mode.
VNAV Modifications
During the cruise phase, VNAV can calculate two types of climbs: cruise and step
climbs. Cruise and planned climbs can be entered by the flight crew. Optimum
step climbs are calculated by the FMC. In all cases, the new climb altitude must
be selected in the MCP altitude window before VNAV commands the climb.
Cruise Climb
Setting an altitude above the current cruise altitude in the MCP altitude window
and pushing the altitude selector causes the cruise altitude to be set to the MCP
altitude and the airplane to climb to the new cruise altitude. The reference thrust
limit is CLB and the pitch flight mode annunciation is VNAV SPD.
Another method to accomplish a cruise climb: set a higher MCP altitude, enter the
altitude in the CRZ ALT line, and execute.
VNAV page title displays CRZ CLB in a climb to cruise altitude.
VNAV page title displays ECON CRZ after level off at cruise altitude.
Planned Step Climb
When a step climb is planned to start at a waypoint, the data can be entered on the
RTE LEGS page. The FMC performance predictions assume the airplane will start
the climb at the identified waypoint.
7 ALL Engine (ENG)
8 Long Range Cruise (LRC)
1 During Cruise Climb
2 End of Cruise Climb
ACT ECON CRZ CLB 2/3
ACT ECON CRZ 2/3
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787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Cruise
11.42.24 Boeing Proprietary
The FMC displays the distance and ETA to the step point on the PROGRESS
page. The corresponding altitude profile point and identifier is shown on the ND.
Enter the cruise altitude as an altitude constraint and the letter S. The FMC
assumes the step climb starts at the waypoint. Accomplish the step climb at the
waypoint with the steps described in cruise climb.
Calculated Step Climb
When a non–zero value is entered into the STEP SIZE line on the PERF INIT or
CRZ page, the FMC calculates optimum points for step climbs as the airplane
performance permits. The climb altitude is determined by the value in STEP SIZE.
Multiple step climbs are possible based on performance and route length. VNAV
commands the step climbs, if the MCP altitude and the FMC CRZ ALT are set to
the new altitude.
1 Step Climb Altitude
/ F L 2 5 0
/FL250S
o
o
0 8 5
PDT
YKM
1 0 4
8 2
40NM
NM
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787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Cruise
Boeing Proprietary 11.42.25
Displays the default step climb size of ICAO.
Valid entries are altitudes from 0 to 9000 in 1000 foot increments.
1 STEP SIZE
90
T O DT G ETA F U EL
N E X T
M O D
SE L S P D TO S T E P C L IMB
AB345 PROGRESS
75
42
17 1305Z
1329Z
1300Z
1307Z/ 12NM
30.0
33.8
35.0
.810
KMWH
QUINT
ELN
<POS REPORT
1 / 4
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
8
C R Z A L T S T E P T
E C O N S P D A T
E P R
ST E P OP T M AXR E C MD
K O R D E T A / F U E L
Z
Z NM
2 3
3
ACT ECON CRZ
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
ENG OUT>
LRC>
FL3 0 FL3 FL370
2030 / 34.5
1300 / 12
FL390
O
FL350
. 10
1.35
ICAO
RTA PROGRESS
/
<
POS REF>
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VNAV
　
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本文鏈接地址：787機組操作手冊Flight Crew Operations Manual 3(68)