# SDR LR7A03038

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 3, 2003
- Submitted: April 4, 2003
- Operation: Air carrier
- Aircraft: [N401LC](https://openairdocs.org/aircraft/N401LC), registered now
- Make and model: Lkheed 382G
- Aircraft serial: 4606
- Aircraft time: 35,306 hours, 21,065 cycles
- System (JASC): [3444 · Ground Proximity System](https://openairdocs.org/jasc/3444)
- Part: Antenna
- Part number: 0131909010
- Part serial: 13594
- Condition: Shorted
- Location: Ground Prox
- Stage of operation: CR
- How discovered: O
- Nature of condition: B
- Precautionary procedure: A, H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/LR7A03038

## Discrepancy

DURING FLIGHT,  CREW REPORTED TCAS FAILED, FOLLOWED SHORTLY BY GPWS AND RADIO ALTIMETER FAILURE.  SMOKE AND FUMES NOTED IN COCKPIT.  DEACTIVATED TRANSPONDER, GPWS AND TCAS SYSTEMS AND SMOKE SUBSIDED.  DIVERTED TO RJTY.  FOUND RADIO ALTIMETER R/T UNIT FAILED AND PRODUCING SMOKE DUE TO SHORTED XMIT ANTENNA.  REPLACED R/T UNIT AND XMIT ANTENNA.  VISUALLY INSPECTED TCAS AND GPWS, NO DEFECTS NOTED.  TCAS RTS IAW HN3443 AND GPWS CHECKED IAW HB3400.18.  LP 11680, ITEM 1.

---
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.