SDR AALA20180529005

Service difficulty report · Connector · Boeing 777323ER

Difficulty date: May 27, 2018
Submitted: May 30, 2018
Operation: Air carrier
Aircraft: N734AR
Make and model: Boeing 777323ER
Aircraft serial: 31480
Aircraft time: 12,505 hours, 1,334 cycles
System (JASC): 3597 · Oxygen System Wiring
Part: Connector
Part number: AMC12RA03W
Condition: Shorted
Location: Zone 200
Stage of operation: IN
How discovered: C
Nature of condition: L
Precautionary procedure: K

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

What was found

AIRCRAFT WAS IN BASE MAINTENANCE. WHILE PERFORMING TEST DROP OF PASSENGER OXYGEN MASKS FOR CUSTOMER CARD B1910AC-0012 CENTER SYSTEM DOORS DO NOT OPEN AND CIRCUIT BREAKER C35405 IN P310 PANEL POPS. TROUBLE SHOT WIRING PER WDM 35-21-23 AND FOUND PIN 1 SHORTED TO PIN 2 ON CONNECTOR DM33254A. REPAIRED PER SWPM AND REPERFORMED GOOD OPERATIONAL TEST OF THE OXYGEN BOX DOOR LATCHES ACTUATORS PER AMM 35-21-00-710-801.