
LANDING GEAR
Description
Aircraft Operations Manual
13.1
PAGE
4
Apr 01/15
used to control various air/ground functions in differ-
ent systems. Some of the systems receive signals
from the WOW and up
−
and downlock switches via
the landing gear relays. These systems are marked
with an asterisk. The relays are supplied with 28
VDC via the LDG RELAYS circuit breaker.
Air/ground (WOW) switches
−
LEFT OUTBOARD SWITCH:
Anti
−
Skid (left and right outboard wheels).
Cockpit voice recorder (weight on wheel, one
condition to erase).
Stall warning (inhibit on ground).
Cabin pressurization system.
−
LEFT INBOARD SWITCH:
Anti
−
Skid (left and right inboard wheels).
Pneumatic supply left (precooler jet pump on/
off control).
Left Attitude Heading Reference System
(inhibit of test function when airborne).
Temperature probe (on/off control).
*
Left side window heating (inhibit of high mode
on ground).
*
Warning Electronic Unit.
*
Landing Gear handle down lock solenoid.
*
Nose Wheel Steering (arm/disarm).
*
Air Conditioning
*
Passenger Light.
*
Active noise.
*
L Np Bottoming Governor.
*
Flight Idle Stop.
*
ATC 1 Transponder.
*
Flight Data Recorder.
*
TCAS/ACAS.
*
−
RIGHT OUTBOARD SWITCH:
Anti
−
Skid (left and right outboard wheels).
Stall Warning (inhibit on ground).
Cabin pressurization system.
Air Data System (inhibit of test function when
airborne).
−
RIGHT INBOARD SWITCH:
Anti
−
Skid (left and right inboard wheels).
Pneumatic supply right (precooler Jet pump
on/off control).
Right Attitude Heading Reference System
(inhibit of test function when airborne).
Landing Gear emergency extension (arm/dis-
arm of explosive bolts).
Right side window heating (inhibit of high mode
on ground).
*
Flight Recorder (backup activation).
*
Landing Gear handle down lock solenoid.
*
Nose Wheel Steering (arm/disarm).
*
R Np Bottoming Governor.
*
Flight Idle Stop.
*
ATC 2 Transponder.
*
ACARS.
*
Up
−
and downlock switches
−
LEFT MLG DOWNLOCK SWITCH:
Landing gear indication.
Hydraulic pump (control signal).
Warning Electronic Unit (Landing gear config
warning).
Flight Idle Stop.
*
TCAS/ACAS.
*
−
RIGHT MLG DOWNLOCK SWITCH.
Landing gear indication.
Flight Recorder.
Ground Proximity Warning System.
Flight Idle Stop.
*
−
NLG DOWNLOCK SWITCH.
Landing gear indication.
Nose wheel steering (arm/disarm).
Battery Ventilation fans.
Anti
−
skid (warning signal control).
−
LEFT MLG UPLOCK SWITCH.
Landing gear indication.
Hydraulic Pump.