# SDR ASAA2021020133989

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 1, 2021
- Submitted: February 3, 2021
- Operation: Air carrier
- Aircraft: [N481AS](https://openairdocs.org/aircraft/N481AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44106
- Aircraft time: 20,737 hours, 6,624 cycles
- System (JASC): [3400 · Navigation System](https://openairdocs.org/jasc/3400)
- Part: Data Unit
- Condition: Malfunctioned
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021020133989

## Discrepancy

CPDLC DATA LINK FAIL. GROUNDED - YES. ACCOMPLISHED B737-900 FIM 34-61 TASK 899, CPDLC / ADS-C OPS NML.

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