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LG POSITION INDICATING AND WARNING SYSTEM - NOSE GEAR DOWN SENSOR
LG POSITION INDICATING AND WARNING SYSTEM - NOSE GEAR DOWN SENSOR
EFFECTIVITY
GUN ALL 32-61-00
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-61-00-006
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LG POSITION INDICATING AND WARNING SYSTEM - NOSE GEAR DOWN SENSOR
32-61-00
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
general
The landing gear position indicating and warning system
operates lights in the flight compartment to show indications
for these MLG conditions:
* Down and locked
* Lever/gear position disagree
* Gear not down warning.
Inputs
The landing gear position indicating and warning system gets
inputs from eight sensors on the main landing gear. Four
sensors are for the down and locked indication and four
sensors are for the up and 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
and inputs from system 2 sensors go to system 2 in the PSEU.
Both systems in the PSEU share information through a common
bus.
Down And Locked Indication
The landing gear position green lights come on when targets
move near the downlock sensors. System 1 operates the
primary position green light. System 2 operates the auxiliary
position green light.
Only system 1 sends MLG 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)
Only system 1 sends left MLG landing gear down and locked
signals to the flight control computer (FCC) A.
See the Digital Flight Control System (DFCS) section for more
information about the FCC. (SECTION 22-11)
Only system 1 sends left MLG landing gear down and locked
signals to the stall management yaw damper (SMYD) 1.
See the Stall Warning System section for more information
about the SMYD. (SECTION 27-32)
Only system 2 sends left MLG landing gear down and locked
signals to the flight control computer (FCC) B.
LG POSITION INDICATING AND WARNING SYSTEM - FUNCTIONAL DESCRIPTION - MLG INDICATION
EFFECTIVITY
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Page 15
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-61-00-007
See the Digital Flight Control System (DFCS) section for more
information about the FCC. (SECTION 22-11)
Only system 2 sends left MLG landing gear down and locked
signals to the stall management yaw damper (SMYD) 2.
See the Stall Warning System section for more information
about the SMYD. (SECTION 27-32)
Disagree And Warning Indications
Two red landing gear position lights, one for each MLG, come
on for one of 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
landing gear is not down and locked and either of these
conditions is true:
* Control lever down
* Left or right thrust lever is less than 44 degree position if the
altitude is less than 800 feet.
System 1 and system 2 operate the red position lights.
Only system 1 sends landing gear down and lock or 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 - MLG INDICATION
EFFECTIVITY
GUN ALL 32-61-00
Page 16
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-61-00-007
LG POSITION INDICATING AND WARNING SYSTEM - FUNCTIONAL DESCRIPTION - MLG INDICATION
LG POSITION INDICATING AND WARNING SYSTEM - FUNCTIONAL DESCRIPTION - MLG INDICATION
EFFECTIVITY
　
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