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 2.  Antiskid Control Panel (Fig. 1)______________________
 A.  The antiskid control panel is located on the P2 panel and is composed of an ANTISKID ON-OFF switch, and an ANTISKID INOP light.
 B.  The ANTISKID ON-OFF switch is of the guarded type controlling the antiskid wheel circuits. The switch acts as an arming switch to provide power to antiskid circuits in the antiskid control unit.
 C.  The ANTISKID INOP light is mounted above the control switch. The light illuminates as a result of built-in-test (automatic or manual test) sensings of faults in the antiskid circuits. Faults affecting antiskid control for the normal brake system will be indicated at all times. Faults affecting antiskid control for the alternate brake system are only indicated when the alternate system is pressurized. This occurs when the normal brake system has failed or when the parking brake is set. The INOP light is also used to detect faults in the touchdown and locked wheel protection circuits when the parking brake is set.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SEE B
(6 PLACES)
SEE A
SEE E
SEE C
SEE D
ANTISKID
SEE F SERVO VALVEABS
RED AMBER RED
GREEN GREEN GREEN
A
RIR0 L

L
LI

RT
L0

PB
OFF OFF

PRESSURE PORT
WHEEL SELECT RETURN PORT
ANTISKID
BRAKE PORT
ANTISKID INOP
ANTISKID CONTROL UP
VALVE XDCR
VALVE
ON
L
B
A
LW SKID
N D I
OFF
ABS
N
AUTO BRAKE
OFF
G
ANTISKID
AUTO BRAKE DISARM
G
CONTROL UNIT
2
E
31
A
A
OFF MAX
R
RTO
DN
ANTISKID LANDING GEAR CONTROL PANEL CONTROL PANEL C
Antiskid System Component Location
Figure 1 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500MAINTENANCE MANUAL
LANDING GEAR
LEVER UP SWITCH

OUTBOARD HUBCAP
1
OUTBOARD HUBCAP FAIRING
1
1 NOT INSTALLED ON INBOARD WHEEL LANDING GEAR LEVER CONTROL CABLE
FWD
LANDING GEAR LEVER UP SWITCH
D

WHEEL
AXLE
DRIVE
COUPLING

TRANSDUCER ADAPTER
TRANSDUCER
NUT
TRANSDUCER INSTALLATION OUTBOARD MAIN GEAR E
Antiskid System Component Location
Figure 1 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

RIGHT WHEEL SHOWN
WEIGHT ON GEAR

Antiskid System Component Location
Figure 1 (Sheet 3)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 3.

4.

5.

A
737-300/400/500MAINTENANCE MANUAL
 D.  The INOP light is also used in conjunction with the manual built-in-test
 procedures to troubleshoot at the antiskid control unit.Transducer (Fig. 1)
__________
 A.  The transducer is a wheel driven speed sensing device located inside each main gear wheel axle. The transducer assembly consists of a stator which is attached to the axle and a rotor mounted inside the stator. The rotor shaft is attached to a drive coupling which meshes with a spider secured to the inside of the hubcap of the wheel. This allows the rotor to turn inside the stator at a rate equal to the rotational speed of the wheel.
　
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