# SDR FDEA202008131878

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 13, 2020
- Submitted: August 14, 2020
- Operation: Air carrier
- Aircraft: [N990FD](https://openairdocs.org/aircraft/N990FD), registered now
- Make and model: Boeing 757232
- Aircraft serial: 22909
- Aircraft time: 85,375 hours, 43,450 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Clamp
- Condition: Out Of Adjust
- Location: Duct
- 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/FDEA202008131878

## Discrepancy

CABIN ALT WARNING AT FL 370.  CABIN ALT WARNING AT FL 370   FOUND #1 PACK SUPPLY DUCT  AT THE CHECK VALVE ( FWD LEFT PACK BAY) ORANGE  SLEEVE AND CLAMPS LOOSE AND NOT SECURED WITH LARGE  AIR LEAK. READJUSTED DUCT SLEEVE AND SECURED CLAMPS  AND ACCOMPLISHED LEAK CHECK AND PRESSURIZED A/C  WITH #1 PACK UP TO 4.0 DIFF PRESS WITH NO FAULTS  NOTED. MX ACCOMPLISHED REF 757 AMM 21-51-15-4-0 AND  21-31-00-5. REMOVED AND REPLACED AIR CONDITIONING CHECK VALVE  AND BOOT ASSY, REF MM 21-51-15-4-0.

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