737 MAX Flight Crew Operations Manual
Automatic Flight -
System Description
MN-FLT-OH-201
4.20.21
ILS Beam Anomaly/Ground Station Failure Detection
For a single channel or F/D only approach, the autopilot will disengage and/or the
F/D bars will be removed if a persistent localizer/glideslope beam anomaly or
ground station failure is detected.
1B785, 1J585 - 1J594
For a dual channel approach prior to annunciation of LAND 3 or LAND 2 (as
installed), the autopilot will disengage and/or the F/D bars will be removed if a
persistent localizer/glideslope beam anomaly or ground station failure is detected.
If a beam anomaly is detected after annunciation of LAND 3 or LAND 2, the
appropriate localizer or glideslope deviation scale will turn amber and flash, the
corresponding deviation pointer will flash, and a horizontal amber line will be
drawn through the appropriate roll (VOR/LOC) or pitch (G/S) mode on the
primary FMA display indicating “mode fail”. The A/P will remain engaged until
manually disengaged.
For ground station failures after annunciation of LAND 3 or LAND 2, the
appropriate localizer or glideslope deviation scale will turn amber and flash, the
corresponding deviation pointer will blank, and a horizontal amber line will be
drawn through the appropriate roll (VOR/LOC) or pitch (G/S) mode on the
primary FMA display indicating “mode fail”. The A/P will remain engaged until
manually disengaged.
Single Engine Landing
1B785, 1J585 - 1J594
If an engine fails and the APU is used to provide a second electrical source prior
to engagement of the second autopilot, LAND 3 will be displayed (as installed),
as the autopilot is still capable of providing rudder compensation throughout the
approach and landing rollout. An approach and autoland to a decision height
below 50 ft is prohibited.
Automatic engine out rudder compensation is provided during A/P approach and
landing.
In the event of a A/P go-around, the A/P will continue to compensate for
asymmetric thrust until another roll mode is selected.
March 1, 2021
