# SDR CALA2026083119023

- 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): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 60683221
- Part serial: 2038
- Condition: Faulted
- Location: Zone 100
- Part time: 8,516 hours, 1,755 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: J, B, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026083119023

## Discrepancy

CABIN ALT AUTO 1 EICAS M THE AUTOMATIC PRESSURIZATION CONTROLLER 1 BITE FOUND A FAILURE. CABIN ALT UP TO APPROX 13000 FEETAS PER TOMC REQUEST REPLACED CABIN AUTO 1 PRESSURE CONTROLLER IAW AMM 21-31-02-004-00 & AMM 21-31-02-404-005 UP TO SECTION 3(D)1.  REPLACED CABIN OUTFLOW VALVE ASSY IAW AMM 21-31-03-002-001 & AMM 21-31-03-402-006. ALL OUTFLOW VALVE OPS AND INDICATIONS NORMAL.  PRESSURIZATION CONTROL SYSTEM SYS TEST CARRIED OUT IAW AMM 21-31-00-705-009 UP TO STEP 3.T.3. CONTINUE FROM STEP 4 PRESSURIZATION CONTROL SYSTEM SYSTEM TEST CARRIED OUT IAW AMM 21-31-00-705-009 UP TO STEP 3.T.3. LOW FLOW INDICATION TEST TO BE CARRIED OUT AS AN LMC ITEM IAW AMM 21-31-00-705-009. ALL OTHER TESTS COMPLETED & CHECKED GOOD.

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