# SDR MALA040571

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 13, 2004
- Submitted: September 23, 2004
- Operation: Air carrier
- Aircraft: N416XJ
- Make and model: Saab 340B
- Registry model: [Saab 340B](https://openairdocs.org/model/saab-340b) (OpenAirDocs)
- Aircraft serial: 340B416
- Aircraft time: 17,752 hours, 19,699 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Control Unit
- Condition: Malfunctioned
- Location: Cabin Pressure
- Stage of operation: CR
- How discovered: O
- Nature of condition: P
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/MALA040571

## Discrepancy

LOST PRESSURIZATION AT 25,000 FT DESCENDED TO 10,000 FT NOTE CABIN ALTITUDE FOLLOWED TO -1.  FOUND C/B G7 POPPED.  RESET, SWITCHED TO MANUAL MODE, FOUND IT CONTROLLED PRESSURIZATION SYSTEM.  MAINTENANCE REPLACED PRESSURIZATION CONTROL UNIT.

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