SDR UALA2012102206042

Service difficulty report · Line · Boeing 777222

Difficulty date: October 19, 2012
Submitted: November 21, 2012
Operation: Air carrier
Aircraft: N781UA
Make and model: Boeing 777222
Aircraft serial: 26945
Aircraft time: 66,913 hours, 11,703 cycles
Engine: Pwa PW4077
System (JASC): 3840 · Air Supply (Water Pressure System)
Part: Line
Condition: Loose
Location: Water System
Stage of operation: IN
How discovered: O
Nature of condition: W
Precautionary procedure: H

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

What was found

CREW REPORTS MOTOR NOISE AND VIBRATION IN DOOR 4 FLOOR AREA. ATTEMPTED TO ISOLATE WITH PACKS, GASPER, CHILLERS, EQUIP COOLING, ETC. NO HELP. RETURNED TO GATE. WATER COMPRESSOR NOISE OBSERVED AT GATE. NOISE GONE AFTER DEACTIVATION. CB G12 P320 PANEL PULLED AND COLLARED. REPLACED COMPRESSOR. VIBRATION GONE COMP WON'T SHUT OFF. SUSPECT PRESSURE SWITCH LOB PRESSURE SWITCH. REPLACED SWITCH, COMP STILL WON'T SHUT OFF. FOUND LOOSE AIR LINE NEAR THE AIR COMPRESSOR. OPS CHECKS NORMAL.