# SDR AALA20170207003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 4, 2017
- Submitted: February 7, 2017
- Operation: Air carrier
- Aircraft: N971TW
- Make and model: Doug DC-9-83
- Registry model: [Doug DC-9-83](https://openairdocs.org/model/douglas-dc-9-83) (OpenAirDocs)
- Aircraft serial: 53621
- Aircraft time: 47,451 hours, 23,680 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Part number: 21184904
- Part serial: 107140
- Condition: Faulty
- Location: Cabin Pressure
- Part time: 52,040 hours, 25,093 cycles
- Stage of operation: CL
- 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/AALA20170207003

## Discrepancy

AIRCRAFT WAS GROUNDED. EMERGENCY DECLARED. IND-DFW FLIGHT RETURNED TO DFW ACCOUNT UNABLE TO PRESSURIZE CABIN. OVERWEIGHT LANDING UNEVENTFUL. REMOVED AND REPLACED CABIN PRESSURE CONTROLLER NR 1(AALA20170204005) AND CABIN PRESSURE CONTROLLER NR 2 IAW AMM 21-32-03. LEAK AND OPERATIONAL CHECK GOOD.

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