SDR UALA2012111906653

Service difficulty report · Jack · Boeing 777222

Difficulty date: November 16, 2012
Submitted: November 20, 2012
Operation: Air carrier
Aircraft: N210UA
Make and model: Boeing 777222
Aircraft serial: 30216
Aircraft time: 45,997 hours, 9,990 cycles
Engine: Pwa PW4077
System (JASC): 2340 · Interphone/Passenger Announcement (PA) System
Part: Jack
Condition: Shorted
Location: Interphone Sys
Stage of operation: NR
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

LOUD HUMMING NOISE HEARD ON FLT & SVC INTERPHONE SYS IN FLT DECK -- IT WILL NOT RESET. ORDERED "AUDIO MANAGEMENT UNIT" MR23508. TRIED NEW "AUDIO MANAGE- MENT UNIT", ISOLATING AUDIO PANELS, O2 PANELS. MICS, HEADSET ASSEMBLIES IN FLT DECK -- STILL NO HELP. REPLACED SHORTED "FLT INTERPHONE AUDIO JACK"- D30020 IN NOSE GEAR P40, OPERATIONAL CHECK OF FLIGHT INTERPHONE & SVC INTERPHONE SYS IN FLT DECK TO GRD, CHECKS LOUD & CLEAR.