SDR CALA2013120293391

Service difficulty report · Pa System · Boeing 747422

Difficulty date: November 28, 2013
Submitted: December 3, 2013
Operation: Air carrier
Aircraft: N121UA
Make and model: Boeing 747422
Aircraft serial: 29167
Aircraft time: 60,640 hours, 7,030 cycles
Engine: Pwa PW4056
System (JASC): 2340 · Interphone/Passenger Announcement (PA) System
Part: Pa System
Condition: Malfunctioned
Location: Cabin
Stage of operation: IN
How discovered: O
Nature of condition: O
Precautionary procedure: K

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

What was found

UPPER DECK PA SPEAKERS SQUEAL WHEN ANY HANDSETS USED, RESET POWER NO HELP. RESET PA CONTROLLER, NO HELP. OEU DISCONNECTED, NO HELP. NEED MORE TIME TO TROUBLESHOOT. LAC REPLACED IAW PTT 6402029, NO HELP. PA TEST SHOWS UPPER DECK OEU FAULT 4-2-14, ROW 16 LT, OEU PCN 580-0679.