737 Flight Crew Operations Manual
Flight Management, Navigation Chapter 11
FMC Takeoff and Climb Section 41
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D6-27370-866-EGP 11.41.1
41 FM C Takeoff and C limbFM C Takeoff and ClimbFi le Highlight
Introduction
The FMC takeoff phase begins with the selection of takeoff/go–around (TO/GA).
Preparation for this phase begins in the preflight phase and includes entry of the
TAKEOFF REF page data.
The takeoff phase automatically changes to the climb phase when climb thrust is
selected. The climb phase continues to the top of climb point, where the cruise
phase begins.
During these phases, the following pages are normally used:
• TAKEOFF REF page – to make last minute changes to the departure
runway
• DEPARTURES page – to make last minute changes to the SID
• CLIMB page – to modify climb parameters and monitor airplane climb
performance
• 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 armed 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 armed 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.
September 26, 2013
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