# SDR UALA2012101705925

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 16, 2012
- Submitted: November 15, 2012
- Operation: Air carrier
- Aircraft: [N777UA](https://openairdocs.org/aircraft/N777UA), registered now
- 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](https://openairdocs.org/jasc/2150)
- Part: Bolt
- Condition: Broken
- Location: Ac Bay
- Stage of operation: CL
- How discovered: O
- Nature of condition: E
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2012101705925

## Discrepancy

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.

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