# SDR DALA2019070504088

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 4, 2019
- Submitted: July 8, 2019
- Operation: Air carrier
- Aircraft: [N669DN](https://openairdocs.org/aircraft/N669DN), registered now
- Make and model: Boeing 757232
- Aircraft serial: 25142
- Aircraft time: 88,670 hours, 40,308 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Clamp
- Condition: Out Of Position
- Location: Ac Pack
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2019070504088

## Discrepancy

SHIP 669 -PRESS- AT FL320 HAD A LOUD SQUEAL AROUND SEAT ROWS 23-25, WHILE DESCENDING FROM FL320 TO FL240 THE CABIN ALTITUDE WARNING SOUNDED WITH CABIN ALTITUDE AT 10K FEET. CABIN AUTO PRESS 1 & 2 FAIL MESSAGES, SWITCHED TO MANUAL AND MADE AN EMERGENCY DESCENT DOWN TO FL100, NO CABIN MASK DEPLOYED. CORRECTIVE ACTION: FOUND LEFT PACK BOOT CLAMP OFF, REPLACED BOTH LT AND RT BOOTS AND CLAMPS. CHECK VALVES BAD, REPLACED BOTH A/C CHECK VALVES. FOUND LT AC DUCT MISADJUSTED WITH CHECK VALVE, ADJUSTED THE SAME. LT PACK LWR COUPLING ON PRIMARY H/E LEAKING AND TWO HOSE COUPLING LEAKING, R/R HOSE COUPLINGS. FAILED HULL DECAY CHECK. FOUND AFT CARGO DOOR SEAL PULLED FROM RETAINER AND FWD CARGO DOOR SEAL WITH A HOLE REPAIRED BOTH. ACCOMPLISHED SINGLE PACK CONFIDENCE AND HULL DECAY CHECK BOTH PASSED. PERFORMED VL FLT, CHECKS GOOD. (5715563)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.