737 Flight Crew Operations Manual
Warning Systems -
System Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 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
• stabilizer trim not set in the takeoff range.
(SB Changes YK982 ; before SB installs or activates takeoff configuration
and cabin altitude warning lights.)
An intermittent warning horn sounds when takeoff configuration warning
activates.
(SB Changes YK982 ; before SB installs or activates takeoff configuration
and cabin altitude warning lights.)
Cabin altitude warning activates when cabin altitude exceeds 10,000 feet. An
intermittent warning horn sounds. The warning horn may be silenced by
momentarily pressing the ALT HORN CUTOUT switch on the Cabin Altitude
Panel.
YK981, YK983 - YW274
(SB Changes YK982 ; after SB installs or activates takeoff configuration and
cabin altitude warning light.)
An intermittent warning horn sounds and the TAKEOFF CONFIG warning light
illuminates when takeoff configuration warning activates.
YK981, YK983 - YW274
(SB Changes YK982 ; after SB installs or activates takeoff configuration and
cabin altitude warning light.)
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.
September 15, 2016
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