737 MAX Flight Crew Operations Manual
Air Systems -
Air Conditioning System
Description
MN-FLT-OH-201
2.30.3
If a primary pack control fails, the affected pack is controlled by the standby pack
control in the opposite controller. A primary or standby pack control failure causes
the MAINT, MASTER CAUTION, and OVERHEAD System Annunciator lights
to illuminate after landing.
If both the primary and the standby pack controls fail for the same pack, the
PACK, MASTER CAUTION, and AIR COND System Annunciator lights
illuminate. The pack will continue to operate without control unless excessive
temperatures cause the pack to trip off.
Both pack lights illuminate if both pack switches are in the OFF position 45
seconds after the flaps are up following takeoff. Both lights extinguish when either
pack switch is placed to AUTO or HIGH.
March 1, 2021