# SDR 9JLA2021010828358

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 13, 2020
- Submitted: January 8, 2021
- Operation: Air carrier
- Aircraft: [N480M](https://openairdocs.org/aircraft/N480M), registered now
- Make and model: Beech 400A
- Registry model: [Beech 400A](https://openairdocs.org/model/hawker-beechcraft-400a) (OpenAirDocs)
- Aircraft serial: RK586
- Aircraft time: 4,035 hours, 3,318 cycles
- System (JASC): [3452 · ATC Transponder System](https://openairdocs.org/jasc/3452)
- Part: Transponder
- Condition: Malfunctioned
- Location: Nr 1
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/9JLA2021010828358

## Discrepancy

IT WAS REPORTED FROM AIR TRAFFIC CONTROL (ATC) THAT THE AIRCRAFTS NR 1 TRANSPONDER SYSTEM WAS NOT TRANSMITTING MODE C ON MULTIPLE LEGS.  THE MAINTENANCE VENDOR FUNCTIONAL CHECKED THE SYSTEM AND WAS NOT ABLE TO VERIFY THE DISCREPANCY ON THE GROUND.  ALL TESTING PASSED.  THE AIRCRAFT WAS RETURNED TO SERVICE.

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