# SDR JJBA20160923010

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 23, 2016
- Submitted: September 26, 2016
- Operation: Air carrier
- Aircraft: N839CA
- Make and model: Dhav DHC8311
- Aircraft serial: 553
- Aircraft time: 31,188 hours, 34,230 cycles
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Adc
- Part number: 7000700940
- Part serial: 98048045
- Condition: Inoperative
- Location: Nr 2
- Part time: 3,378 hours, 3,629 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/JJBA20160923010

## Discrepancy

GEAR UNSAFE HORN SOUNDING WHEN GEAR IS RETRACTED.  R & R NR 2 ADC, OPS CK SATISFACTORY ON GROUND, REQUIRES OCF.  AN EMERGENCY WAS DECLARED AND RETURN TO FIELD.

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