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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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LG POSITION INDICATING AND WARNING SYSTEM - FUNCTIONAL DESCRIPTION - MLG INDICATION
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The landing gear position indicating and warning system
operates lights in the flight compartment to show indications
for these NLG conditions:
* Down and locked
* Lever/gear position disagree
* Gear not down warning.
Inputs
The landing gear position indicating and warning system gets
inputs from four sensors on the nose landing gear. Two sensors
are for the down indication and two sensors are for the locked
indication.
The control lever position switch supplies lever position data.
The autothrottle switch packs supply thrust lever position for the
gear not down warning.
Both flight control computers supply a ground when the
airplane altitude is less than 800 feet.
Inputs from the system 1 sensors go to system 1 in the PSEU.
Inputs from system 2 sensors go to system 2 in the PSEU. Both
systems in the PSEU share information through the same bus.
Down And Locked Indication
The landing gear position green lights come on when targets
move near the down sensors and near the lock sensors. System
1 operates the primary position green light. System 2 operates
the auxiliary position green light.
Only system 1 sends NLG landing gear down and locked
signals to the flight data acquisition unit (FDAU).
See the Flight Data Recorder System (FDRS) section for more
information about the FDAU. (SECTION 31-31)
Disagree And Warning Indications
A red landing gear position light comes on for these conditions:
* Control lever/landing gear position disagree - lever not
down and gear not up and locked (gear retraction)
* Control lever/landing gear position disagree - lever down
and gear not down and locked (gear extension)
* Gear not down warning.
The red light comes on for the gear not down warning when the
nose landing gear is not down and locked and either of these
conditions is true:
* Control lever down
* Left or right thrust lever less than 44 degree position if the
altitude is less than 800 feet.
LG POSITION INDICATING AND WARNING SYSTEM - FUNCTIONAL DESCRIPTION - NLG INDICATION
EFFECTIVITY
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System 1 and system 2 operate the red position light.
Only system 1 sends NLG landing gear disagree and warning
signals to the flight data acquisition unit (FDAU).
See the Flight Data Recorder System (FDRS) section for more
information about the FDAU. (SECTION 31-31)
LG POSITION INDICATING AND WARNING SYSTEM - FUNCTIONAL DESCRIPTION - NLG INDICATION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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LG POSITION INDICATING AND WARNING SYSTEM - FUNCTIONAL DESCRIPTION - NLG INDICATION
LG POSITION INDICATING AND WARNING SYSTEM - FUNCTIONAL DESCRIPTION - NLG INDICATION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-61-00-008
General
The aural warning module gives the continuous horn sound for
a landing warning.
There are four sets of conditions which cause the landing
warning.
In the first set of conditions, the horn sounds when these
conditions are true:
* Gear is not down and locked
* Flap position is from 0 to 10 units
* Thrust levers are set for landing
* Radio altitude is between 200 and 800 feet.
For the first set of conditions, push the horn cutout switch near
the flap lever to stop the horn.
In the second set of conditions, the horn sounds when these
conditions are true:
* Gear is not down and locked
* Flap position is from 0 to 10 units
* Thrust levers are set for landing
* Radio altitude is less than 200 feet.
For the second set of conditions, the pilot can not stop the horn.
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