# SDR ASAA2021090835889

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 8, 2021
- Submitted: September 9, 2021
- Operation: Air carrier
- Aircraft: [N563AS](https://openairdocs.org/aircraft/N563AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35180
- Aircraft time: 53,916 hours, 15,948 cycles
- System (JASC): [2760 · Drag Control System](https://openairdocs.org/jasc/2760)
- Part: Transmitter
- Part number: H504B
- Condition: Faulted
- Location: Lt Wing Spoiler
- Stage of operation: IN
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021090835889

## Discrepancy

DFCS BITE LIBRARY TEST 60.31 FAULT. AILERON SPOIL-4 SIG FAIL FCC B. FAULT MESSAGE 22-11158. SUSPECTED LRU SPOIL-4 POS SENSOR-2. GROUNDED - YES. REPLACED #4 SPOILER POSITION SENSOR REF B737-800 AMM 22-11-27-400-801. OPS NORMAL. BITE LIBRARY 60.31 ALL TESTS PASS CHANNEL A & B.

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