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.
15.20.6 D6-27370-866-EGP
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.
Red light illuminated –
• landing gear is in disagreement with LANDING GEAR lever position
(in transit or unsafe).
• landing gear is not down and locked (with either or both forward thrust
levers retarded to idle, and below 800 feet AGL).
All lights extinguished – landing gear is up and locked with the LANDING GEAR
lever UP or OFF.
Aural Indications
A steady warning horn is provided to alert the flight crew whenever a landing is
attempted and any gear is not down and locked. The landing gear warning horn is
activated by forward thrust lever and flap position as follows:
Flaps up through 10 –
• altitude below 800 feet RA, when either forward thrust lever set
between idle and approximately 20 degrees thrust lever angle, or an
engine is not operating and the other thrust lever is less than 34 degrees.
The landing gear warning horn can be silenced (reset) with the landing
gear warning HORN CUTOUT switch
• if the airplane descends below 200 feet RA, the warning horn cannot be
silenced by the warning HORN CUTOUT switch.
Flaps 15 through 25 –
• either forward thrust lever set below approximately 20 degrees, or an
engine not operating and the other thrust lever is less than 34 degrees.
The landing gear warning horn cannot be silenced with the landing gear
warning HORN CUTOUT switch.
Flaps greater than 25 –
• regardless of forward thrust lever position. The landing gear warning
horn cannot be silenced with the landing gear warning HORN
CUTOUT switch.
The warning indication is cancelled when the configuration error is corrected.
September 26, 2013
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