.
RTE LEGS page – to modify the route and monitor route progress
.
PROGRESS page – to monitor the overall progress of the flight
.
N1 LIMIT page – to select alternate climb thrust limits
.
DEP/ARR INDEX page – to select an approach during a turn–back.
Takeoff Phase
When last minute changes are made to the departure runway and SID, the TAKEOFF REF and DEPARTURES pages must be modified to agree. The modifications are performed the same as during preflight.
With correct takeoff parameters, the FMC commands the selected takeoff thrust when the TO/GA switch is pushed. During the takeoff roll, the autothrottle commands the thrust and the FMC commands acceleration to between V2+15 and V2+25 knots.
LNAV can be selected prior to takeoff. Prior to 50 feet radio altitude, roll command is wings level. At 50 feet radio altitude, if within engagement criteria, LNAV engages and provides roll commands to fly the route leg. VNAV may be engaged to control the climb profile.
Note: For LNAV to be engaged on the ground, the departure runway must be
selected and the course, to the first waypoint, must be within 5 degrees of
the runway heading.
Copyright . The Boeing Company. See title page for details.
Flight Management, Navigation -FMC Takeoff and Climb 737 Flight Crew Operations Manual
Climb Phase
VNAV commands acceleration to:
.
250 knots
.
waypoint speed constraints, or
.
the speed restriction associated with the origin airport, whichever is more
restrictive.
YA721 - YC413, YK101 - YK104 At the climb thrust reduction point, climb thrust can be selected. Passing 10,000 feet, VNAV commands an acceleration to the economy climb speed, which is maintained until entering the cruise phase. Waypoint speed constraints take priority if slower than target speed.
YA613 - YA687, YD651 - YD655 At the climb thrust reduction point, the FMC commands a reduction to the selected climb thrust. Passing 10,000 feet, VNAV commands an acceleration to the economy climb speed, which is maintained until entering the cruise phase. Waypoint speed constraints take priority if slower than target speed.
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.
Copyright . The Boeing Company. See title page for details.
11.41.2 June 1, 2005
Flight Management, Navigation -FMC Takeoff and Climb 737 Flight Crew Operations Manual
Climb Page
The climb page is used to evaluate, monitor, and modify the climb path. The data on the climb page comes from preflight entries made on the route and performance pages.
YA721, YA722 The climb page is automatically selected by pushing the CLB function key on the ground and during takeoff and climb.
YA613 - YA687, YA801 - YC413, YK101 - YK104 The climb page is automatically selected by pushing the CLB function key on the ground and during takeoff and climb. The TAKEOFF REF page automatically transitions to the climb page after takeoff.
YD651 - YD655 The climb page is automatically selected by pushing the VNAV function key on the ground and during takeoff and climb. The climb page is the first of the three pages selected with the VNAV function key. Access from other performance pages is via the NEXT/PREV PAGE key. The TAKEOFF REF page automatically transitions to the climb page after takeoff.
The FMC climb mode can be economy or fixed speed. In either mode, similar data is displayed on the page.
Copyright . The Boeing Company. See title page for details.
Flight Management, Navigation -FMC Takeoff and Climb 737 Flight Crew Operations Manual
YA613 - YC413, YK101 - YK104
Copyright . The Boeing Company. See title page for details.
11.41.4 June 1, 2005
Flight Management, Navigation -FMC Takeoff and Climb 737 Flight Crew Operations Manual
YD651 - YD655
Page Title
The page title displays the type of climb. Normally, the title displays ECON for
the economy climb mode. Fixed speed climbs 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.
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