# SDR 2004FA0000297

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 6, 2004
- Submitted: April 12, 2004
- Operation: General aviation
- Aircraft: [N421ZM](https://openairdocs.org/aircraft/N421ZM), registered now
- Make and model: Cessna 421C
- Registry model: [Cessna 421C](https://openairdocs.org/model/cessna-421c) (OpenAirDocs)
- Aircraft serial: 421C1058
- Engine: Cont GTSIO520*
- System (JASC): [3418 · Stall Warning System](https://openairdocs.org/jasc/3418)
- Part: Detector
- Part serial: 137
- Condition: Inoperative
- Location: Stall Warning
- Stage of operation: NR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2004FA0000297

## Discrepancy

THIS NEWLY OVERHAULED DETECTOR WAS INSTALLED AND OPS CHECKED AFTER A COUPLE OF CHECKS THE STALL HORN WILL STAY ON.  RETURNED UNIT FOR ANOTHER O/HED DETECTOR.  THIS ABOUT SECOND AIRCRAFT I WENT THROUGH THIS WITH (ORDERING DETECTORS UNTIL I GET ONE THAT WORKED.  NEED BETTER QC).

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