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SUCH AS TOWING WITH BOTH TIRES FLAT ON
ONE MAIN GEAR, TOWING ON SOFT TERRAIN,
TOWING UP INCLINES MORE THAN 5 DEGREES,
OR OTHER ABNORMAL LOADS, REFER TO THE
TOW AIRPLANE UNDER ABNORMAL LOADS
TASK. IF YOU DO NOT OBEY THIS CAUTION,
THE NOSE GEAR TOWING STRESS CAN BE MORE
THAN THE SPECIFICATIONS PERMIT.
CAUTION: DO NOT APPLY THE BRAKES OR OVERSTEER
THE AIRPLANE WHEN YOU USE TOWBARLESS
TOWING. IF YOU DO NOT OBEY THESE
INSTRUCTIONS, YOU CAN CAUSE DAMAGE TO
THE NOSE GEAR STRUCTURE AND THE
HYDRAULIC SYSTEMS.
CAUTION: IF YOU USE A TOW BAR, YOU CAN CAUSE THE
SHEAR PINS TO SHEAR IF YOU USE THE
AIRPLANE BRAKES WHILE YOU TOW THE
AIRPLANE. MOST TOWBARLESS TOW VEHICLES
DO NOT HAVE A SHEAR PIN TO LIMIT THE LOADS
IF AIRPLANE BRAKES ARE USED DURING
TOWING. IF AIRPLANE BRAKES ARE USED
WHILE TOWING WITH A TOWBARLESS TOW
VEHICLE ATTACHED TO THE NOSE LANDING
GEAR, DO THE HARD LANDING OR HIGH DRAG/
SIDE LOAD LANDING INSPECTION FOR THE NOSE
LANDING GEAR AREAS.
CAUTION: DO NOT TOW THE AIRPLANE WITH THE NOSE
GEAR FULLY COMPRESSED OR EXTENDED
MORE THAN 23.5 INCHES (597 MM) FROM THE
BOTTOM OF THE INNER CYLINDER TO THE
BOTTOM OF THE STEERING PLATE. YOU CAN
DAMAGE THE NOSE GEAR STRUT INTERNALLY.
NOTE: With two flat tires on one main gear, if it is possible, you
should replace one of the flat tires with a serviceable
tire before towing to prevent damage to the tires and
wheels.
NOSE WHEEL STEERING SYSTEM - TRAINING INFORMATION POINT - TOWING
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-51-00-009
NOSE WHEEL STEERING SYSTEM - TRAINING INFORMATION POINT - TOWING
NOSE WHEEL STEERING SYSTEM - TRAINING INFORMATION POINT - TOWING
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-51-00-009
Purpose
The landing gear position indicating and warning system shows
landing gear position in the flight compartment. It also warns
the pilots when the landing gear is not down for a landing.
Inputs
The landing gear position indicating and warning system uses
these proximity sensors to supply landing gear position data to
the proximity switch electronics unit (PSEU):
* Left and right main gear up and locked sensors (4)
* Left and right main gear downlock sensors (4)
* Nose gear up/down lock sensors (2)
* Nose gear down sensors (2).
The control lever position switches supply lever position.
The flight control computers supply radio altimeter data.
The stall management yaw damper computers and a switch on
the trailing edge flap control unit supply the trailing edge flap
position.
The horn reset switch sends a reset signal for aural warning.
The autothrottle switch packs supply thrust lever position data.
General Description
The PSEU processes all of the inputs and sends signals to the
landing gear position lights and the aural warning module.
Three red landing gear position lights come on when the
landing gear moves during extension and retraction and during
the gear not down warning.
When the landing gear extends to the down and locked position,
three primary and three auxiliary green landing gear position
lights come on.
The PSEU also sends signals to the flight data aquisition unit
(FDAU) about the status of the landing gear. See the flight data
recorder system (FDRS) section for more information about the
FDAU. (SECTION 31-31)
Abbreviations and Acronyms
* alt - altitude
* bat - battery
* BITE - built-in test equipment
* CB - circuit breaker
* cont - control
* dc - direct current
* FCC - flight control computer
* FDAU - flight data aquisition unit
* FRDS - flight data recorder system
* fwd - forward
* LG - landing gear
LG POSITION INDICATING AND WARNING SYSTEM - INTRODUCTION
EFFECTIVITY
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32-61-00-001
* MLG - main landing gear
* NLG - nose landing gear
* PSEU - proximity switch electronics unit
* pwr - power
* SMYD - stall management yaw damper
* sw - switch
* sys - system
* TE - trailing edge
LG POSITION INDICATING AND WARNING SYSTEM - INTRODUCTION
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