# SDR AALA201903269003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 22, 2019
- Submitted: March 26, 2019
- Operation: Air carrier
- Aircraft: [N949AN](https://openairdocs.org/aircraft/N949AN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 29537
- Aircraft time: 54,854 hours, 22,578 cycles
- System (JASC): [3444 · Ground Proximity System](https://openairdocs.org/jasc/3444)
- Part: Antenna
- Part number: S67200218
- Condition: Unreliable
- Location: Radio Altimeter
- Stage of operation: AP
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA201903269003

## Discrepancy

AT 3000 AGL, FLAPS 10,  GEAR UP, INTERMITTENT GEAR HORN AND RETARD IN HUD.  THE AIRCRAFT WAS GROUNDED.  MAINTENANCE TROUBLESHOT AND REPLACED ALL 4 LOW RANGE RADIO ALTIMETER ANTENNAS IAW AMM 34-33-00-810-801.  BITE TESTED GOOD.

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