# SDR UIEA2025121401344

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 14, 2025
- Submitted: December 16, 2025
- Operation: Air carrier
- Aircraft: [N1511A](https://openairdocs.org/aircraft/N1511A), registered now
- Make and model: Boeing 767383
- Aircraft serial: 24318
- Aircraft time: 111,549 hours, 19,943 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Part number: 21173886
- Part serial: 22246
- Condition: Faulted
- Location: Cabin Pressure
- Stage of operation: DE
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2025121401344

## Discrepancy

AT TOP OF DESCENT, CREW ALTITUDE EICAS MSG. CABIN ALT WENT TO 11,000 FT AFTER DESCENT TO 8000 FT, CABIN PRESS DIFF WAS 0.(<P>FOLLOWED FIM FOR CABIN ALTITUDE BITE CHECK PER FIM 21-31-00. FOUND CABIN ALT CONTROLLER 2 FAULT LOW FLOW. THEN FOLLOWED AMM 36-23-00 AIR SUPPLY CONT SYS BITE, WHICH TESTED GOOD. GOOD PRESSURE CHECK PER AMM 05-51-21. </P> / <P>LP 1727920: CABIN ALT CONTROLLER 2 WORKS NORMAL IN MANUAL MODE. PLACED AUTO MODE ON MEL. R & R AUTO PRESS UNIT ASSY IAW AMM 21-31-00-001. BITE & OPS TEST OK, NO REPORTS NOTED IAW AMM 21-31-00-705-001. PLACARDS REMOVED.

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