# SDR 2008UALA02979

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 23, 2008
- Submitted: May 27, 2008
- Operation: Air carrier
- Aircraft: [N218UA](https://openairdocs.org/aircraft/N218UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 30222
- Aircraft time: 29,484 hours, 3,735 cycles
- Engine: Pwa PW4090
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Controller
- Condition: Malfunctioned
- Location: Air Con Sys
- Stage of operation: CL
- How discovered: O
- Nature of condition: W
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2008UALA02979

## Discrepancy

RIGHT ENG BLEED SYSTEM HAS LARGE PRESSURE FLUCTUATIONS WITH ASSOCIATED ENG PARAMETER FLUCTUATIONS IN CLIMB AND IN CRUISE.  WITH RIGHT PACK SELECTED -OFF- THE PRESSURE AND ENG PARAMETERS ARE STABLE.  REPLACED ASCPC FOR RT AIR SUPPLY. ASCPC INSTALLED AND CABIN PRESS CONTROL SYSTEM TEST PASSED.


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