# SDR MXIA202001030001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 13, 2019
- Submitted: January 3, 2020
- Operation: Air carrier
- Aircraft: [N189PP](https://openairdocs.org/aircraft/N189PP), registered now
- Make and model: Lear 45LEAR
- Aircraft serial: 45264
- Aircraft time: 5,586 hours, 6,213 cycles
- Engine: Hnywl TFE73120R
- Engine time: 5,556 hours, 6,176 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Muffler
- Part number: 12945096801
- Condition: Ruptured
- Location: Bleed Air System
- Part time: 5,586 hours, 6,213 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/MXIA202001030001

## Discrepancy

AT CRUISE ALTITUDE OF 40,000 FEET THE PILOTS HEARD A POP FOLLOWED BY A LOSS OF PRESSURIZATION. AN EMERGENCY WAS DECLARED, AN EMERGENCY DECENT MADE TO 15,000 FEET. THE AIRCRAFT RETURNED TO KRIC AND MADE A NORMAL LANDING. INVESTIGATION IDENTIFIED A RUPTURED BLEED AIR MUFFLER P/N 12945-096-801. THE UNIT WAS REMOVED AND SENT OUT FOR REPAIR. IT WAS INSTALLED AND THE PRESSURIZATION SYSTEM OPERATED NORMALLY.

---
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.