# SDR AALA20050619

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 26, 2005
- Submitted: September 27, 2005
- Operation: Air carrier
- Aircraft: [N172AJ](https://openairdocs.org/aircraft/N172AJ), registered now
- Make and model: Boeing 757223
- Aircraft serial: 32400
- System (JASC): [2611 · Smoke Detection](https://openairdocs.org/jasc/2611)
- Part: Blower
- Part number: 033638
- Condition: Inoperative
- Location: Smoke Detector
- Stage of operation: CL
- How discovered: O
- Nature of condition: N
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA20050619

## Discrepancy

BOS - INFLIGHT  CARGO DETECTION AIR STATUS MESSAGE DISPLAYED AFTER TAKEOFF.  RETURNED TO BOS AND LANDED WITHOUT INCIDENT.  REPLACED PLENUM PRESSURE SWITCH FOR NUMBER 4 SMOKE DETECTION BLOWER.  SYSTEM GROUND CHECKED NORMAL OPERATION.

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