SDR UALA2012101705925

Service difficulty report · Bolt · Boeing 777222

Difficulty date: October 16, 2012
Submitted: November 15, 2012
Operation: Air carrier
Aircraft: N777UA
Make and model: Boeing 777222
Aircraft serial: 26916
Aircraft time: 70,997 hours, 12,789 cycles
Engine: Pwa PW4077
System (JASC): 2150 · Cabin Cooling System
Part: Bolt
Condition: Broken
Location: Ac Bay
Stage of operation: CL
How discovered: O
Nature of condition: E
Precautionary procedure: O

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

What was found

ON CLIMBOUT NOTICEABLE VIBRATION RIGHT SIDE BETWEEN ROWS 8-10. PER CREW VIBRATION GOES AWAY WHEN THE RIGHT PACK IS SHUT OFF. ACPD 777 MT 05-UA1, FOUND RIGHT RAN AIR DUCT CONNECTION WITH SECONDARY HEAT EXCHANGER BROKEN BOLTS (8M IN A ROW) CAUSING VIBRATION. DEBRIEFED INBOUND FLT CREW, CONFIRMED VIBRATION WENT AWAY WHEN RIGHT PACK SELECTED OFF ON DESCENT. DEFERRED RIGHT PACK INOP, RAN AIR DOOR DEACTIVATED CLOSED.