737 MAX Flight Crew Operations Manual
Flight Management, Navigation -
FMC Takeoff and Climb
11.41.2
MN-FLT-OH-201
VNAV Armed for Takeoff
VNAV may be armed on the MCP prior to takeoff provided the following
requirements have been met:
• a valid flight plan has been entered
• performance data has been entered and executed
• both flight director switches have been switched on
Target Speeds will follow the profile listed in the Climb Phase.
The MDS will annunciate VNAV armed on the FMA when VNAV is selected
prior to takeoff and it is capable of being armed. On takeoff and after reaching 400
feet above the runway, the FCC will automatically engage VNAV if armed.
VNAV Takeoff -One Engine Out
During the all engine takeoff flight phase, VNAV will be enabled to automatically
adjust the target airspeed profile upon engine out detection.
If a single engine failure is detected while in the VNAV takeoff flight phase (for
all engines) and below the engine out takeoff acceleration height, the FMC will
calculate and issue a target speed equal to the greater of current airspeed or V2
limited to be less than or equal to V2 + 20 KCAS.
This speed will continue to be updated until an engine failure is detected, at which
point the target speed will be frozen at the present value.
VNAV will continue to generate this target speed until reaching the engine out
acceleration height or when VNAV guidance initiates a level-off prior to reaching
the engine out acceleration height, at which point the VNAV target speed will be
changed to VREF + 70 KCAS (flaps up maneuver speed) subject to the applicable
speed limits for the current airplane configuration.
VNAV will continue to issue the VREF + 70 KCAS target speed through flap
retraction and thrust reduction, and retains this target for obstacle clearance until
the pilot selects and executes the ALL ENG prompt on the CDU or VNAV
transitions to the cruise flight phase to complete the engine-out takeoff flight
phase.
The FMC engine-out mode will not be set when the groundspeed is less than 60
knots. If the engine-out mode is set while on the ground, the FMC will exit the
mode when the speed drops below 60 knots. Engine-out speeds will be available
if an engine fails on takeoff after 60 knots.
March 1, 2021
