737 MAX Flight Crew Operations Manual
Normal Procedures -
Amplified Procedures
MN-FLT-OH-201
NP.21.21
AIR TEMPERATURE source selector - As needed
Note:
always monitor supply duct temperatures
TRIM AIR switch (as installed) - ON
Verify that the DUCT OVERHEAT or the ZONE TEMP lights
(as installed) are extinguished.
Temperature selectors - As needed
RECIRCULATION FAN switch(es) - AUTO
Air conditioning PACK switches - As required
Note:
if PACK use is desired, always operate both packs together.
Switching one Pack AUTO and the other OFF causes a
greater APU fuel flow.
ISOLATION VALVE switch - OPEN
Engine BLEED air switches - ON
If the APU is ON:
APU BLEED air switch - ON or OFF
Note:
if temperature allows, switch the APU Bleed - OFF to
reduce the APU fuel flow.
If APU Bleed is ON, verify that the DUAL BLEED light is
illuminated.
If APU Bleed is OFF, verify that the DUAL BLEED light is
extinguished.
-700 Fleet Only
Verify that the PACK TRIP OFF lights are extinguished.
-800 and MAX8 Fleets Only
Verify that the PACK lights are extinguished.
Verify that the WING-BODY OVERHEAT lights are
extinguished.
-700 and -800 Fleets Only
Verify that the BLEED TRIP OFF lights are extinguished.
March 1, 2021
