737 MAX Flight Crew Operations Manual
Warning Systems -
System Description
MN-FLT-OH-201
15.20.5
Warning Systems
Intermittent Cabin Altitude/Configuration Warning
Takeoff configuration warning is armed when the airplane is on the ground and
either or both forward thrust levers are advanced for takeoff. Takeoff
configuration warning activates if:
• trailing edge flaps are not in the flaps 1 through 25 takeoff range, or
• trailing edge flaps are in a skew or asymmetry condition, or have
uncommanded motion, or
• leading edge devices are not configured for takeoff or have
uncommanded motion, or
• speed brake lever is not in the DOWN position, or
• spoiler control valve is open providing pressurized hydraulic fluid to the
ground spoiler interlock valve, or
• parking brake is set, or
1B402 - 1B786, 1B807 - 1J594
• mid exit door not secure, or
1B402 - 1B786, 1B807 - 1J594
• overwing door not secure, or
• stabilizer trim not set in the takeoff range.
An intermittent warning horn sounds and the TAKEOFF CONFIG warning light
illuminates when takeoff configuration warning activates.
Cabin altitude warning activates when cabin altitude exceeds 10,000 feet. An
intermittent warning horn sounds and the CABIN ALTITUDE warning light
illuminates. The warning horn may be silenced by momentarily pressing the ALT
HORN CUTOUT switch on the Cabin Altitude Panel. The warning light remains
illuminated until the cabin altitude descends below 10,000 feet.
WARNING: The Cabin Altitude and Takeoff Configuration Warnings use
the same intermittent tone when activated.
Landing Gear Configuration Warnings
Visual indications and aural warnings of landing gear position are provided by the
landing gear indicator lights and landing gear warning horn.
Visual Indications
The landing gear indication lights are activated by signals from each gear, the
LANDING GEAR lever, and the forward thrust lever position as follows:
Green light illuminated – landing gear is down and locked.
October 26, 2021
