Service difficulty report · Anti-Skid Valve · Boeing 7377BD

Difficulty date
November 17, 2024
Submitted
May 7, 2025
Operation
Air carrier
Aircraft
N7713A
Make and model
Boeing 7377BD
Aircraft serial
33919
Aircraft time
63,100 hours, 33,789 cycles
Part
Anti-Skid Valve
Part number
39353
Part serial
8577
Condition
Faulty
Location
Zone 700
Stage of operation
TX
How discovered
O
Nature of condition
O
Precautionary procedure
O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

ANTI SKID INOP LIGHT ILLUMINATED INFLIGHT. 32-44-21-000-801<[01] OK TO CONTINUE PER MEL 32-2-01 SP1+SP2;[02] PERFORMED AACU BITE CHECK PER FIM 32-42 TASK 801. FAULT ? BOX 1-4?. PERFORMED RESISTANCE CHECK OF NORM ANTI-SKID VALVES 1-4 PER FIM 32-42 TASK 804. ALT ANTI-SKID VALVES 1-2 PER FIM 32-42 TASK 805. RESISTANCE CHECKS GOOD. R&R AACU IAW AMM 32-42-21. R&R AUTO SPEED BRAKE MODUEL IAW AMM 27-62-35. R&R PARKING BRAKE SOV IAW 32-44-21. NO FIX;[03] R+R RT AND LT OUTBOARD ANTI SKID VALVES (V9 & V10) PER AMM 32-42-31; NO HELP. CHECKED WIRING PER WDM 32-41-11. FOUND OVER 12K OHM RESISTANCE BETWEEN WHEEL WELL CONNECTOR D46050P PIN 9 AND ANTI SKID VALVE (V10) CONNECTOR D932 PIN 1. REQUIRES WIRING REPAIR.;[04] REPLACED VALVES IN MAINTENIX.;[05] REMOVED WIRE HARNESS (P/N BMS13-60Y11CL2-18GA) INSTALLED NEW CONNECTOR D932 AT V10 R O/B ANTI SKID VALVE RAN WIRES TO D48050P CONNECTOR FOUND PIN 9 AND 10 WOULD NOT LOCK;REQUIRES NEW CONNECTOR;[06] PULLED I/B AND O/B ANTI-SKID CIRCUIT BREAKERS P6-3 E 16 & E18;[07] PUSHED IN C/B. ALSO REMOVED AND REPLACED CONNECTOR D46050P AND FINISHED WIRING PER WDM 32-41-11 AND SWPM 20-10-04. PERFORMED OPS CHECK OF ANTISKID SYSTEM AND CHECKED GOOD PER AMM 32-42.00 AND OTHER AFFECTED SYSTEMS AMM 49-61-00; 26-15-00;26-11-00 AND 24-21-00. THIS CLEARS MDDR # 223818.

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