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In the third set of conditions, the horn sounds when these
conditions are true:
* Gear is not down and locked
* Flap position is from 15 to 25 units
* Thrust levers are set for landing.
For this set of conditions, the pilot can not stop the horn.
In the fourth set of conditions, the horn sounds when the gear is
not down and locked and the flap position is more than 25 units.
The pilot can not stop the horn.
When the airplane is in the fourth set of conditions, the system
inhibits the landing warning horn during a go-around. The
system inhibits the warning for 12 seconds after the pilot puts
the gear lever in the up position.
LG POSITION INDICATING AND WARNING SYSTEM - AURAL WARNING - GENERAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-61-00-011
LG POSITION INDICATING AND WARNING SYSTEM - AURAL WARNING - GENERAL DESCRIPTION
LG POSITION INDICATING AND WARNING SYSTEM - AURAL WARNING - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 32-61-00
Page 23
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-61-00-011
General
The landing gear position indicating and warning system uses
the aural warning system to give a landing gear not down aural
warning to the pilots.
Inputs
The landing gear position sensors send landing gear down and
lock position data to the PSEU.
The landing gear control lever position switch sends a down
position signal to the PSEU.
Both stall management yaw dampers (SMYDs) supply signals
when the trailing edge flaps are less than 1 unit or more than 25
units. This signal gives the trailing edge flaps takeoff position to
the PSEU.
The trailing edge flap landing warning switch on the trailing
edge flap control unit supplies a signal when the trailing edge
flaps are more than 10 units. This signal gives the trailing edge
flaps landing position to the PSEU.
Both flight control computers (FCCs) supply signals when the
airplane altitude is less than 200 feet and less than 800 feet.
The engine running relays send left and right engine running
signals to the PSEU.
The autothrottle switch packs supply signals when the thrust
levers are at the idle position.
The horn reset switch lets you stop the aural warning during
some of the conditions that cause a landing gear not down aural
warning.
Aural Warning
The PSEU sends a landing gear not down aural warning signal
to the aural warning module. This causes the steady horn to
sound.
The aural warning has two types of warnings, one that you can
not stop by the horn reset switch and one that you can stop by
the horn reset switch.
The aural warning does not operate for 20 seconds if the
landing gear control lever is in the down position.
The aural warning operation is different for each of these
trailing edge (TE) flap conditions:
* 0 through 10 units
* 15 through 25 units
* More than 25 units.
LG POSITION INDICATING AND WARNING SYSTEM - AURAL WARNING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-61-00-009
TE Flap Position 0 Through 10 Units, Condition 1
This type of aural warning operates when one or more landing
gear is not in the down and locked position, the landing gear
control lever is not down, and all of these conditions are true:
* TE Flap landing warning switch A & B <10 units
* One or both thrust levers at idle or one or both engines not
running
* Altitude between 800 and 200 feet.
The horn can be stopped with the horn reset switch for the
above conditions.
TE Flap Position 0 Through 10 Units, Condition 2
This type of aural warning operates when one or more landing
gear is not in the down and locked position, the landing gear
control lever is not down, and all of these conditions are true:
* TE Flap landing warning switch A & B <10 units
* One or both thrust levers at idle or one or both engines not
running
* Altitude less than 200 feet.
The horn can not be stopped with the horn reset switch when
the trailing edge flaps are in the 0 through 10 unit position, and
the airplane altitude is less than 200 feet.
TE Flap Position 15 Through 25 Units
This type of aural warning operates when one or more landing
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