737 MAX Flight Crew Operations Manual
Automatic Flight -
System Description
MN-FLT-OH-201
4.20.5
AFDS Status Annunciation
The following AFDS status annunciations are displayed in the A/P status display
located above the attitude indicator on the outboard display unit:
• CMD (one or both autopilots are engaged)
• FD (the flight director is ON and the autopilot is either OFF or engaged
in CWS)
• CWS P (pitch mode engaged in CWS)
• CWS R (roll mode engaged in CWS)
• SINGLE CH (for single A/P ILS approach, annunciates after localizer
capture and remains on for entire approach. For dual A/P ILS approach,
annunciates after localizer capture and extinguishes after pitch monitor
confidence test is successfully completed).
Fail-Operational Autoland Status Annunciations
1B785, 1J585 - 1J594
(as installed)
The following annunciations provide the flight crew with autoland system mode
and status:
• LAND 3 – two autopilots, three inertial sources, and the associated
sensors are operating normally for an automatic landing and rollout.
• LAND 2 – a failure has occurred above Alert Height and redundancy is
reduced; but the autoland system is still capable of making an automatic
landing and rollout.
• NO AUTOLAND – the system is unable to make an automatic landing.
With a LAND 3 (fail-operational) indication, the autoland system level of
redundancy is such that a single fault cannot prevent the autopilot system from
making an automatic landing.
With a LAND 2 (fail passive) indication, the level of redundancy is such that a
single fault cannot cause a significant deviation from the flight path.
The NO AUTOLAND status is annunciated if a system failure has occurred.
FLARE and ROLLOUT will not arm when NO AUTOLAND is annunciated.
An advisory message is displayed on the Engine Display for any fault which limits
the capability of the automatic landing system. NO LAND 3 indicates the autoland
system does not have the required redundancy for LAND 3 operations. NO
AUTOLAND indicates autoland is not available.
Should any single failure occur below Alert Height and the system is still capable
of continuing the autoland and rollout, LAND 3 will remain displayed and the
airplane will land and roll out normally without failure annunciation. Failure or
autoland downgrade annunciations will then be displayed when the airplane has
decelerated below 40 kts and the autopilots have been disengaged.
March 1, 2021
