# SDR ASAA2019042639116

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 23, 2019
- Submitted: April 26, 2019
- Operation: Air carrier
- Aircraft: [N495AS](https://openairdocs.org/aircraft/N495AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41728
- Aircraft time: 12,685 hours, 4,140 cycles
- System (JASC): [2200 · Auto Flight System](https://openairdocs.org/jasc/2200)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: AP
- 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/ASAA2019042639116

## Discrepancy

UNSUCCESSFUL AIII PRACTICE APPROACH; JUST INSIDE THE MARKER, LOCALIZER WENT ALMOST FULL SCALE TO THE RIGHT (A/C L OF COURSE) = APPRCH WARN & NO AIII, PLANE CORRECTED TO CENTERLINE. HUD DISPLAY WENT BLANK & WAS INTERMITTENT. GROUNDED - YES. ACCOMPLISHED HGS SENSORS & SYSTEM TEST REF SMM 34-36-00, OPS CK NML. FLIGHT HISTORY SHOWS NUMEROUS ASSOCIATED FAULT MESSAGES, SUCH AS FLARE CMD NOT INIT, ILS ANT 1/2 AFT, ILS ANOMALY DETECT, A/S EXCEED, TRK ERROR EXCEEDED, CLP LAT GUIDANCE INVALID, SM LAT GUIDANCE INVALID, ETC.

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