# SDR 99ZZZX2121

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 20, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N292ME](https://openairdocs.org/aircraft/N292ME), registered now
- Make and model: Lear 35A
- Registry model: [Lear 35A](https://openairdocs.org/model/gates-learjet-35a) (OpenAirDocs)
- Aircraft serial: 292
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Valve
- Part number: 66002021
- Condition: Malfunctioned
- Location: Engine
- Part time: 1,147 hours
- Stage of operation: CR
- Nature of condition: P
- Precautionary procedure: A, B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99ZZZX2121

## Discrepancy

SDL/IND - WHILE EN ROUTE AFTER CLIMB-OUT TO 40,000 FEET MSL, FLIGHT CREW NOTICED CABIN PRESSURIZATION CLIMBING.  FLIGHT CREW MADE A PRECAUTIONARY EMERGENCY DESCENT AND DIVERTED TO GUP. MAINTENANCE REMOVED AND REPLACED BLEED AIR REGULATING VALVES.  AIRCRAFT RETURNED TO SERIVCE.

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