737 Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
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11.31.20 D6-27370-866-EGP
1 Thrust Reduction
Climb thrust is selected by pushing the N1 switch or automatically upon reaching
the thrust reduction altitude.
2 VNAV Engagement
VNAV commands an airspeed increase to the planned climb speed profile, limited
by configuration.
3 VNAV Climb
The VNAV climb profile uses VNAV SPD at the default climb speed or pilot
selected climb speed to remain within all airspeed and altitude restrictions that are
part of the SID entered into the active route. Autothrottle uses selected climb
thrust limit.
Note: Selection of ENG OUT on the CLB page provides the crew with advisory
engine out performance information.
If the climb speed profile cannot achieve an altitude restriction, the UNABLE
NEXT ALTITUDE scratchpad message is shown.
4 Climb Restrictions
VNAV enters the VNAV PTH mode to remain within departure or waypoint
restrictions. Speed maintained during this time can be:
• procedure based speed restriction
• waypoint speed restriction
• default VNAV climb speed
• manually entered climb speed.
5 Top Of Climb (T/C)
The point where the climb phase meets the cruise altitude is called the top of
climb. Approaching this point, the FMC changes from the climb phase to the
cruise phase. The T/C is shown any time the FMC calculates a change from a
climb phase to a cruise phase, such as a step climb.
The T/C point is shown on the map as a green open circle with the label T/C.
September 15, 2016
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