737 MAX Flight Crew Operations Manual
Air Systems -
Controls and Indicators
2.10.6
MN-FLT-OH-201
AUTO –
• in-flight –
•the left recirculation fan operates if both packs are operating unless
either PACK switch is in HIGH
•the right recirculation fan operates if both packs are operating unless
both PACK switches are in HIGH.
• on the ground –
•the left recirculation fan operates unless both PACK switches are in
HIGH
•the right recirculation fan operates even if both PACK switches are in
HIGH.
8
PACK Light
Illuminated (amber) –
• indicates pack trip off or failure of both primary and standby pack
controls, or
• indicates failure of the Flow Control Valve to open when commanded
on, or
• an incorrect pack switch configuration after takeoff
•turning either PACK switch ON will extinguish both PACK lights if
lights illuminated because of a configuration problem.
9
TRIP RESET Switch
Push (if fault condition is corrected) –
• resets BLEED, PACK or ZONE TEMP lights
• related engine bleed air valve opens, or related pack valve opens, or
related trim air modulating valve opens
Lights remain illuminated until reset.
March 1, 2021