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During the climb, VNAV complies with the LEGS page waypoint altitude and speed constraints. A temporary level–off for a crossing altitude restriction is accomplished at the current commanded speed.
When the climb speed profile causes an anticipated violation of a waypoint altitude constraint, the FMC displays the CDU scratchpad message UNABLE NEXT ALTITUDE. A different speed profile that provides a steeper climb angle must be manually selected.
If a CLB 1 or CLB 2 derate is selected, the derate is maintained for the initial part of the climb. Thrust eventually increases to maximum climb thrust by 15,000 feet.
Climb Pages Climb Page
The CLB page is used to evaluate, monitor, and modify the climb path. The data
on the CLB page comes from preflight entries made on the RTE and PERF INIT
pages.

The CLB page is selected by pushing the CLB function key on the ground, or

during takeoff and climb.
The FMC climb mode can be economy, max rate, max angle, or fixed speed. In
each of the modes, similar data is displayed on the page.

Copyright . The Boeing Company. See title page for details.
11.41.2  December 1, 2000

Flight Management, Navigation -FMC Takeoff and Climb 737 Operations Manual

Page Title
The page title displays the type of climb. Normally, the title displays ECON for
the economy climb mode. Other climb modes modify the title.

ECON indicates the speed is based on a cost index.
MAX RATE indicates the speed is based on the maximum altitude over the
shortest period of time.

MAX ANGLE indicates the speed is based on the maximum altitude over the

shortest horizontal distance.
Fixed climb speeds display XXXKT for a fixed CAS climb speed or M.XXX for
a fixed Mach climb speed profile and are manually entered by the crew.

Reasons for selecting climbs other than ECON are:

.
takeoff/climb acceleration segment constraints

.
waypoint speed constraints

.
an altitude constraint associated with a speed constraint

Flight Management, Navigation -FMC Takeoff and Climb 737 Operations Manual

.
a speed restriction

.
a crew–entered speed.

Displays ACT when the climb phase is active.

Cruise Altitude (CRZ ALT)
The cruise altitude from the PERF INIT page is displayed. A new altitude can be manually entered.

Target Speed (TGT SPD)
Displays computed values or manually entered values for the selected mode. Computed speed is limited to a maximum of 340 knots/M.82.
Airspeed and/or Mach may be entered using the keyboard. Title will display manually entered value.
The active controlling speed is highlighted in reverse video.

Speed Restriction (SPD REST)
The speed restriction line displays the speed restriction/altitude from one of the following sources:
.
the navigation database value for the origin airport

.  
waypoint related restriction from the RTE LEGS page if restriction limits
climb speed

.
a default speed of 250 knots and 10,000 feet (example 250/10000)

.  on airplanes with U10, displays XXX/FLAPS if the active speed
restriction is lower than the minimum speed for the selected flap setting

.  
displays XXX/HOLD when decelerating to hold speed prior to hold entry
fix.

 

Dashes displayed if no active speed restriction exists.
Manual crew entries or deletions may be made. HOLD or FLAPS speed may not be deleted or modified.
Note:  If the FMC default speed restriction is overwritten, it will be deleted and not return after the overwrite condition passes. (e.g. the default of 250/10000 is overwritten to 230/3000, after 3000 feet is passed there will be no speed restriction and VNAV will accelerate to the unrestricted climb speed.)
The active controlling speed is highlighted in reverse video.

Climb Page Prompts
Push – selects various CLB pages.
Copyright . The Boeing Company. See title page for details.
11.41.4   June 4, 2004

Flight Management, Navigation -FMC Takeoff and Climb 737 Operations Manual
Following line selection, the prompt for that page blanks.

AT XXXXX

The waypoint constraint line displays the next waypoint having an altitude constraint. Constraints are entered on the RTE LEGS page or by departure procedure selection. The constraints can be deleted on this page or the RTE LEGS page. The waypoint may be a HOLD AT point.
Display is blank if no restriction exists.

TO XXXXX
Displays ETA and distance to go to the waypoint on AT XXXXX line. If no waypoint constraint exists, values are for CRZ ALT.

ERR XXXXX
Displays predicted altitude undershoot for the waypoint on AT XXXXX line.
　
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