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32-43-01
ALL ú ú 01 Page 103 ú Feb 25/86
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
20.1 seconds seconds Less than 16 18.2 seconds 16.2 seconds adjustment or bad out of S139,S140,S283) switch(s)(S133, of adjustment or brake arming Automatic speed-switch, S276, out bad Wheel speed R289 A/B ON relay or control unit Servo valve open Throttle bad Control unit bad bad or wiring error or bad control unit switches in control unit bad 1 connector Put spoiler handle to DOWN (stowed) position. Check that 0V dc is at pin 56 of D1040 antiskid module Put spoiler handle to ARMED position. Check that 28V connector. If check fails: fails: module connector. If check and 35 of D1040 antiskid 28V dc at pins 17,21,23, idle stop and check for Retard both throttles to at pins 17,21,23, and 35 of ward. Check that 0V dc is throttles all the way for-500 ohms. If check fails: connector. If check fails: pin 37 If greater than 0V dc at 0V dc is at pin 37 of D1040 antiskid control module to position 1. Check that Turn selector OFF and then ----------------D1040 is approximately tions. Advance both any one of the decel posi-switch to OFF and back to Turn AUTOBRAKE selector dc is at pin 56 of D1040 D1040 antiskid module connector Check that resistance between pins 41 and 46 on Adjust or replace Replace control unit wiring R289 or repair control unitReplace antiskid valve Replace servo Adjust or replace throttle switch switch S276 (AMM 27-62-111/ 401). as required (AMM 31-26-11/ 401; AMM 27-62-04/ 401). Replace relay
AIRPLANES WITH THE THRUST REVERSER SYNC-LOCK HAVE MICROSWITCH PACK ASSEMBLY, M1639 (ENGINE 1) AND M1640 (ENGINE 2).
G17610
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32-43-01
ALL ú ú 01 Page 104 ú Nov 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
22.1 seconds Wiring error or defective control unit Check that 0 volt is at pin If not 0 volts If 0 volts 55 of D1040 Repair wiring Replace antiskid control unit
24.1 seconds A/B valve module defective (solenoid valve pressure switch indicates > 1000 psi when solenoid valve not Turn hydraulic power off. Check that pin 51 of D1040 antiskid control module is grounded If ground, Replace A/B valve module V122
energized) If no ground, remove sole-If ground, If no ground, noid switch connector D2572 from A/B valve module V122. Short pins 2 and 3 on D2572 solenoid switch connector. Check pin 51 on D1040 Replace solenoid switch on A/B valve module Check wiring and repair as re-quired
26.1 seconds Automatic speed brake arming switch S276 out of adjustment or defective Place spoiler handle to DOWN (stowed) position. 56 of D1040 antiskid module connector Place spoiler handle to ARMED position. Check that Check that 0V dc is at pin 28V dc is at pin 56 of D1040 connector. If check fails: Adjust or replace switch S276 (Ref 27-62-111 R/I)
28.2 seconds Right inboard wheel speed switch defective --------------- Replace antiskid unit
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
32-43-01
ALL ú ú 01 Page 105 ú Feb 25/86
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
30.2 seconds Servo valve open or control unit defective (voltage on servo valve not high when commanded on) Check that resistance be-tween pins 41 and 46 on D1040 is approximately 500 ohms servo valve replace control unit If 500 ohms, If not, replace
32 seconds R289 (A/B ON) relay defective Turn autobrake selector switch OFF and then to po-sition 1. Jump between pins 47 and 37 on D1040 antiskid control module. Remove jumper and check that pin 37 on D1040 reads 28V DC. If check fails: Replace R289
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