# SDR UIEA2019122326121

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 21, 2019
- Submitted: December 23, 2019
- Operation: Air carrier
- Aircraft: [N1361A](https://openairdocs.org/aircraft/N1361A), registered now
- Make and model: Boeing 767-31B
- Registry model: [Boeing 767-31B](https://openairdocs.org/model/boeing-767-31b) (OpenAirDocs)
- Aircraft serial: 26265
- Aircraft time: 90,883 hours, 19,823 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: A/C Pack
- Condition: None
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2019122326121

## Discrepancy

PACKS ARE EXTREMELY LOUD AND SURGE SIGNIFICANTLY.  ACCOMPLISHED AN OPERATIONAL TEST ON BOTH PACKS WITH ENGINE BLEED AND ALSO APU BLEED IAW AMM 21-51-00.  OBSERVED NO SURGE OR LOUD NOISE WHILE RUNNING WITH APU BLEED. WHEN RUNNING PACKS WITH ENGINE BLEED, OBSERVED NO SURGE BUT LITTLE LOUDER THAN NORMAL NOISE COMING FROM F/O WALL VENT.  PERFORMED A BITE OF AIR SUPPLY BITE MODULE IAW FIM 36-20-00 WITH NO FAULTS NOTED AND BOTH PACK CONTROLLERS IAW AMM 21-51-00 WITH NO RESULTS. ALSO NOTICED NO FLUCTUATIONS IN DUCT PRESSURE OR ABNORMAL NOISE WITH PACKS RUNNING.

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