SDR UALA2011022400938

Service difficulty report · Ground Wire · Boeing 757222

Difficulty date: February 23, 2011
Submitted: March 10, 2011
Operation: Air carrier
Aircraft: N549UA
Make and model: Boeing 757222
Aircraft serial: 25397
Aircraft time: 72,777 hours, 21,005 cycles
Engine: Pwa PW2040
System (JASC): 2497 · Electrical Power System Wiring
Part: Ground Wire
Condition: Unsecure
Location: Electrical Sys
Stage of operation: IN
How discovered: O
Nature of condition: J
Precautionary procedure: K

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

What was found

ON NR 2 ENG START WITH RT GENERATOR DESELECTED RT BUSS KICKED OFFLINE. LOST LOWER EICAS SCREEN. RT BUSS OFF MESSAGE ON UPPER EICAS. TRIED NEW RT GCU & BPCU - NO HELP. REINSTALLED ORIGINAL. REPLACED C904, C903 - NO HELP. RT BUSS NOT POWERED, BORROWED ELEC SYS CONTROL PANEL FROM OTHER ACFT -- NO HELP. REINSTALLED ORIGINAL. RT BUSS OFF, RT INSTRUMENT TRANSFER BUSS ON. SECURED GROUND WIRE AT D1818, C904 R BTB (PIN 40). RT BUSS POWERS NORMALLY WITH APU, EXT PWR OR RT ENGINE.