# SDR UIEA200800110

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 6, 2008
- Submitted: April 15, 2008
- Operation: Air carrier
- Aircraft: [N506MC](https://openairdocs.org/aircraft/N506MC), registered now
- Make and model: Boeing 747-2D3B
- Registry model: [Boeing 747-2D3B](https://openairdocs.org/model/boeing-747-2d3b) (OpenAirDocs)
- Aircraft serial: 21252
- Aircraft time: 91,579 hours, 19,085 cycles
- System (JASC): [2611 · Smoke Detection](https://openairdocs.org/jasc/2611)
- Part: Smoke Detector
- Part number: 2156646
- Part serial: 393
- Condition: Malfunctioned
- Location: Zone 200
- Stage of operation: CR
- 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/UIEA200800110

## Discrepancy

DIVERSION TO YJT DUE TO "MAIN DECK CARGO SMOKE DET ZONE 4 LIGHT ILLUMINATED WITH CARGO AND MASTER FIRE ANNUNCIATOR LIGHTS ILLUMINATED.  AFTER LANDING RETESTED OKAY (NORMAL).  AIRCRAFT ALSO SUSTAINED AN OVERWEIGHT LANDING.  SWAPPED ZONE 3 AND 4 SMOKE DETECTORS A/B PER AMM 26-14-00.  ZONE 4 SYSTEM A P/N ON 2156-646 S/N 393 SYSTEM B P/N ON 2156-10C S/N 869.  SYSTEMS CHECKED NORMAL.  PERFORMED OVERWEIGHT LANDING PHASE 1 INSPECTION IAW AMM 5-51-39.  NO DAMAGE NOTED.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.