737 MAX Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
11.31.22
MN-FLT-OH-201
MCP Altitude Intervention
The altitude intervention switch may be used to resume climb after a temporary
level off.
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.
To resume the climb, put the clearance altitude into the MCP altitude window and
push the altitude intervention switch. VNAV SPD engages. Pitch maintains FMC
speed and thrust increases to the climb limit. In the example, the airplane climbs
to FMC CRZ ALT and then levels off in cruise.
The altitude intervention switch may be used during climb or descent to delete
altitude restrictions between the current altitude and the MCP altitude. When level
at a restriction altitude, and cleared to a higher altitude prior to crossing the
restriction waypoint, reset the MCP altitude to the new clearance altitude and push
the altitude intervention switch.
10,000'
FL250
T/C
EC
ON
C
LB
S
PD
FL190
TEMPORARY
VNAV ALT
ALTITUDE
LEVEL OFF
INTERVENTION
SWITCH
10,000'
FL250
T/C
EC
ON
C
LB
S
PD
FL190
AT FL190'
BCD
CROSS
BCD
ALTITUDE
MCP ALTITUDE RESET AND
ALTITUDE INTERVENTION
SWITCH PUSHED.
RESTRICTION
March 1, 2021
