# SDR 00111

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 10, 2003
- Submitted: September 17, 2003
- Operation: Air carrier
- Aircraft: N525TW
- Make and model: Lear 25
- Registry model: [Lear 25](https://openairdocs.org/model/learjet-25) (OpenAirDocs)
- Aircraft serial: 011
- Aircraft time: 14,755 hours, 13,941 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Part number: 162972
- Part serial: 330
- Condition: Inoperative
- Location: Cabin Pressure
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/00111

## Discrepancy

PILOT REPORTED PRESSURIZATION PROBLEMS CABIN ALTITUDE INCREASING WITH ALTITUDE, RETURN TO DEPARTURE AIRPORT.   WILL UPDATE REPORT AFTER MAINTENANCE.  REMOVED AND REPLACED CABIN ALT CONTROLLER.   AIRCRAFT RETURN TO SERVICE.

---
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.