# SDR CALA2026083119025

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 29, 2026
- Submitted: August 31, 2026
- Operation: Air carrier
- Aircraft: [N649UA](https://openairdocs.org/aircraft/N649UA), registered now
- Make and model: Boeing 767322
- Aircraft serial: 25286
- Aircraft time: 132,949 hours, 20,305 cycles
- Engine: Pwa PW4060
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Relief Valve
- Part number: 10364225
- Part serial: 2517
- Condition: Faulted
- Location: Zone 100
- Part time: 832,949 hours, 720,305 cycles
- Stage of operation: CR
- 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/CALA2026083119025

## Discrepancy

THUMPING NOISE AT DOOR 1R INFLIGHT. DURING A DETAILED VISUAL INSPECTION OF R1 DOOR,  FOUND LOWER DOOR BUSTLE DETACHED & LOOSE ON FWD SIDE.  BUSTLE RESECURED IAW AMM 25-66-01-416-010.   WHILE CARRING OUT THE EXCESSIVE CABIN PRESSURE LEAKAGE TEST IAW AMM 05-51-24-782-001, ACFT FAILED TO MAINTAIN PRESSURE. OBSERVED THAT LOWER POSITIVE PRESSURE RELIEF VALVE HAD OPENED & WAS VENTING OVERBOARD. CABIN PRESSURE LEAK CHECK CARRIED OUT, POST POSITIVE PRESSURE RELIEF VALVE REPLACEMENT, IAW AMM 05-51-24-782-001.  LEAK CHECK PASSED.   OBSERVED PRESSURE DROP FELL WITHIN SATIAFACTORY ZONE LIMITS. NO AUDIBLE NOISES OR LEAKS NOTICED INTERNALLY OR EXTERNALLY AT R1 DOOR OR AROUND ACFT. LOWER POSITIVE PRESSURE.   RELIEF VALVE REPLACED IAW AMM 21-32-01/201. STATIC SYS LEAK CHK OF LOWER POSITIVE PRESSURE RELIEF VALVE TO BE CARRIED OUT.

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