# SDR AALA201905239011

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 22, 2019
- Submitted: May 24, 2019
- Operation: Air carrier
- Aircraft: [N814NN](https://openairdocs.org/aircraft/N814NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 29562
- Aircraft time: 30,607 hours, 12,132 cycles
- System (JASC): [3444 · Ground Proximity System](https://openairdocs.org/jasc/3444)
- Part: Antenna
- Condition: Faulty
- Location: Radio Altimeter
- Stage of operation: DE
- How discovered: O
- Nature of condition: N
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA201905239011

## Discrepancy

AIRCRAFT WAS GROUNDED: PILOT REPORTS DESCENDING TO 12000, PASSING 13,500 AT 293 KNOTS, AUTO PILOT AND AUTOTHROTTLES ENGAGED, LNAV-VNAV PATH. IN CRUISE CONFIGURATION, WE GOT 3 RED GEAR LIGHTS AND HORN FOR APPROXIMATEY 3-4 SECONDS. THEN NORMAL. ALL INDICATIONS NORMAL DURING CONFIG. MAINTENANCE REPORTS DFDR DOWNLOAD SHOWED LEFT RADIO ALTIMETER FAULTED. REPLACED RADIO ALTIMETER ANTENNAS IAW AMM 34-33-11. OPS CHECKS OF LANDING GEAR WARNING ARE NORMAL IAW AMM 31-51-00.

---
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.