737 Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 11.31.21
MCP Altitude Intervention
The altitude intervention switch may be used to resume climb after a temporary
level off.
YW273, YW274
(SB Changes YK981 - YQ456)
The Altitude Intervention function will only apply to the active flight plan.
Whenever the airplane levels off at an MCP altitude that is not in the FMC, VNAV
ALT engages. In the illustration above, FMC cruise altitude is FL250 and the
clearance altitude, FL190, is set in the MCP. Pitch maintains altitude and thrust
maintains FMC target speed. In the illustration above, the speed after the
temporary level off would be ECON CLB SPEED.
10,000'
FL250
T/C
E
C
O
N
C
L
B
S
P
D
FL190
TEMPORARY
VNAV ALT
ALTITUDE
LEVEL OFF
INTERVENTION
SWITCH
September 15, 2016
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