Service difficulty report · Relay · Boeing 777224

Difficulty date
August 26, 2021
Submitted
August 27, 2021
Operation
Air carrier
Aircraft
N78009
Make and model
Boeing 777224
Aircraft serial
29479
Aircraft time
106,997 hours, 10,633 cycles
Part
Relay
Condition
Arced
Stage of operation
TX
How discovered
O
Nature of condition
B
Precautionary procedure
D

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

What was found

GATE RETURN SMOKE IN THE CABIN. FOUND ELECTRICAL ARCING ON THE P300 PANEL UPON ASESSMENT OF DAMAGE TO P300 PANEL, REMOVED AND FOUND RELAY K24002 GROUND SERVICE SELECT RELAY SEVERELY DAMAGED, SUSPECT INTERNAL FAILURE. NO FOD NOTED IN AREA. REFERENCE SSM 24-22-41, WDM 24-21-31, 24-51-41. AC AND (1 EA.) P-49 PANEL A-5 VOICE RCDR RELAY. REF. AMM TASK # 23-71-01. [ACFT. # 0009]. VOX RCDR; (2 EA.) P-210 PANEL L-12 FLT. RCDR DC & E-23 FLT. RCDR F.O.M. (REF. L.P. # 6861022). LOCATION: (1 EA.) P-11 PANEL E-13 DE-ACTIVATED (PULLED) 4 EA. FLT. RECORDER CIRCUIT BREAKERS. FOUND WIRE W4830-0301-1/0 BURNED AT P-300 PANEL. FOUND WIRE W4830-0401-1/0 BURNED AT P-300 PANEL. FOUND WIRE W4830-0302-1/0 BURNED AT P-300 PANEL. FOUND WIRE W4830-0402-1/0 BURNED AT P-300 PANEL. FOUND WIRE W4830-0303-1/0 BURNED AT P-300 PANEL. FOUND WIRE W4830-0403-1/0 BURNED AT P-300 PANEL. ADD EMP:U131143 24-41-31. FOUND WIRE W4030-0001-2/0 BURNED AT P-300 PANEL. REFERENCE WDM FOUND WIRE W4030-0002-2/0 BURNED AT P-300 PANEL. REFERENCE WDM 24-41-31. 24-41-31. FOUND WIRE W4030-0003-2/0 BURNED AT P-300 PANEL. REFERENCE WDM FOUND WIRE W4030-0004-04 BURNED AT P-300 PANEL. REFERENCE WDM 24-41-31. 24-22-41. FOUND WIRE W4228-0004-02 BURNED AT P-300 PANEL. REFERENCE WDM FOUND WIRE W4228-0005-02 BURNED AT P-300 PANEL. REFERENCE WDM 2