# SDR ASAA2023101345630

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 13, 2023
- Submitted: October 16, 2023
- Operation: Air carrier
- Aircraft: [N419AS](https://openairdocs.org/aircraft/N419AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41734
- Aircraft time: 39,503 hours, 12,468 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: LD
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023101345630

## Discrepancy

AFTER APP MODE ENGAGED ON ILS 16R, SINGLE CHANNEL BLINKED, APP MODE DISENGAGED. G.S. STAYED ACTIVE. LOC/VOR MODE WENT BACK TO ARRMED. APP BUTTON NON RESPONSIVE. GROUNDED - YES. DFCS CHANNEL A&B SHOWED NO RELATED FAULTS LAST FLIGHT, HGS COMPUTER SHOWED NO FAULTS LAST FLT. PERFORMED W/NAV 4000 (IFR) TESTER ILS LOC/GS TESTS. PERFORMED DFGS CURRENT STATUS AND LAND VERIFY TESTS W/ NO FAULTS. ALL TESTS GOOD. NO HISTORY LAST 90 DAYS ATA 22, 34 AND 27.

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