# SDR 0203916739

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 1, 2002
- Submitted: December 4, 2002
- Operation: Air carrier
- Aircraft: N639US
- Make and model: Boeing 747251F
- Aircraft serial: 23887
- Aircraft time: 59,496 hours, 13,172 cycles
- System (JASC): [3260 · Landing Gear Position and Warning](https://openairdocs.org/jasc/3260)
- Part: Circuit Card
- Condition: Faulty
- Location: Warning System
- Stage of operation: AP
- How discovered: O
- Nature of condition: N
- Precautionary procedure: L
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/0203916739

## Discrepancy

DURING APPROACH, THE RED LANDING GEAR LIGHT ILLUMINATED WITH LANDING GEAR DOWN.  RECEIVED A GPWS WARNING AT 500 FEET.  AIRCRAFT EXECUTED A GO-AROUND.  RECYCLED THE LANDING GEAR AND ALL INDICATIONS WERE NORMAL.  REPLACED AURAL WARNING SYSTEM CIRCUIT CARDS A3, A6 & A11. OPERATIONAL CHECK GOOD.

---
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.