# SDR 9617686637

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 12, 1996
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N637US
- Make and model: Boeing 747251B
- Aircraft serial: 23548
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Y-Duct
- Condition: Cracked
- Location: Nr 3 Pylon
- Stage of operation: TO
- Nature of condition: J
- Precautionary procedure: C, D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/9617686637

## Discrepancy

DURING TAKEOFF, THE NR 3 FIRE WARNING LIGHT ILLUMINATED ACCOMPANIED BY HIGH NACELLE TEMPERATURE INDICATIONS.  AIRCRAFT ABORTED TAKEOFF AND RETURNED TO GATE.  FOUND CRACK IN Y-DUCT AT PYLON AREA.  REPAIRED DUCT AND REPLACED HIGH STAGE VALVE AND CONTROLLER, 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.