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constraints. A temporary level–off for a crossing altitude restriction is
accomplished at the commanded speed.
When the climb profile fails to reach a waypoint altitude constraint, the FMC
displays the CDU scratchpad message UNABLE NEXT ALTITUDE. Deleting
climb derates or selecting a reduced climb speed thus giving a steeper climb angle,
may enable the airplane to reach the altitude constraint.
December 01, 1999
747 Operations Manual
Flight Management, Navigation -
FMC Takeoff and Climb
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.41.3
Climb Page
The climb page is used to evaluate, monitor, and modify the climb path. Data on
climb page comes from preflight entries made on the route and performance
pages.
The climb page is the first of the three pages selected with the VNAV function key.
FMC climb can be economy, fixed speed, or engine out.
1 Page Title
The page title displays active (ACT) or modified (MOD) climb. Usually, the title
contains ECON for economy climb. Fixed speed and engine out modify the title.
• ECON – speed based on a cost index
• LIM SPD – speed based on airplane configuration limiting speed
• MCP SPD – MCP speed intervention selected
• XXXKT – fixed CAS climb speed profile
• M.XXX – fixed Mach climb speed profile
• E/O – engine out mode selected
Fixed climb speeds are for:
• takeoff/climb acceleration segment constraints
• a flight crew selected speed (SEL SPD)
• a speed transition
VNAV
<E C O N E NG
2
5
S E L S P D
3
18 0 00
TR A N S AL T
4
0
3 5 2 5 0 /
5
2 5 0 0
3 5 0LO 2 L O NG
AT L A C RE
M A X A N G L E
OU T>
C L B D I R >
-- -/- - - - -
S P D R E S T R
72/1000 0
S D T R A N S
2
F L
C R Z
P
A L T
1 /
- - - - - - - - - - - - - - - - - - - - - - - -
0
A C T 2 0 K T C L B
2 7
E R R O R
3
4
5
6
7
8
9
10
11
12
2
1
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.41.4 D6-30151-425
Flight Management, Navigation -
FMC Takeoff and Climb
• a speed restriction associated with an altitude
• waypoint speed constraints
2 Cruise Altitude (CRZ ALT)
Displays cruise altitude entered on PERF INIT page.
Valid entries are: XXX, XXXX, XXXXX, or FLXXX. Altitude displays in feet or
flight level depending on transition altitude.
3 Economy Speed (ECON SPD), Selected Speed (SEL SPD)
ECON SPD -
• speed based on cost index in CAS or Mach
• used by the FMC at altitudes above all waypoint speed constraints, speed
restrictions, and speed transition altitudes
Valid entries are CAS or Mach.
SEL SPD - displays when flight crew enters speed.
4 Speed Transition (SPD TRANS)
Speed transition line displays the transition speed/altitude from one of these
sources:
• the navigation database value for the origin airport
• the greater of a default speed of 250 knots or VREF+100 knots and
10,000 feet (example 272/10000)
Not displayed above transition.
Can be deleted.
5 Speed Restriction (SPD RESTR)
Speed restrictions at an altitude less than the cruise altitude and not associated
with a waypoint are manually entered on this line.
Displays dashes before entry by flight crew.
Valid entry is a CAS and altitude (example 240/8000).
6 Economy (ECON)
Push – changes climb speed to ECON.
Displays when the climb speed is not ECON.
7 Waypoint Constraint (AT XXXXX)
Displays next airspeed and/or altitude constraint at waypoint XXXXX.
Can also display HOLDAT XXXXX followed by a speed/altitude constraint.
December 01, 1999
747 Operations Manual
Flight Management, Navigation -
FMC Takeoff and Climb
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.41.5
FMC commands the slower of constraint speed or performance speed.
Constraints entered onRTE LEGS page.
Delete here or on RTE LEGS page.
Blank if no constraint exists.
8 ERROR atWaypoint
Displays altitude discrepancy and distance past waypoint where altitude will be
reached.
Blank if no error exists.
9 Transition Altitude (TRANS ALT)
Transition altitude for origin airport contained in navigation database. FMC uses
18,000 feet if transition altitude is not available.
　
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