# SDR AALA202009179009

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 16, 2020
- Submitted: September 18, 2020
- Operation: Air carrier
- Aircraft: [N895NN](https://openairdocs.org/aircraft/N895NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31149
- Aircraft time: 24,770 hours, 10,272 cycles
- System (JASC): [3444 · Ground Proximity System](https://openairdocs.org/jasc/3444)
- Part: Transceiver
- Part number: 8220334003
- Part serial: 17R2LF
- Condition: Defective
- Location: Radio Altimeter
- Stage of operation: CL
- How discovered: O
- Nature of condition: P
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202009179009

## Discrepancy

AIRCRAFT WAS NOT GROUNDED: ON TAKE OFF NO RADIO ALTIMETER DISPLAYED EITHER SIDE.  VNAV WOULD NOT ENGAGE UNTIL 2500 AFL.  REPLACED LOW RANGE RADIO ALTIMETER RECIEVER/TRANSMITTER AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK, PER AMM 34-33-21.

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