# SDR ASAA2021010633828

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 6, 2021
- Submitted: January 8, 2021
- Operation: Air carrier
- Aircraft: [N518AS](https://openairdocs.org/aircraft/N518AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35693
- Aircraft time: 43,757 hours, 12,976 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Autoland Sys
- Condition: Malfunctioned
- 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/ASAA2021010633828

## Discrepancy

UNSUCCESSFUL A3 PRACTICE APPROACH UPON PRESSING 2ND AP GOT NO AIII.  TRIED TO MANUALLY ENGAGE, BUT STILL DID NOT WORK AND HAD TO MANUALLY LAND.  GROUNDED-YES.  DFCS FAULT REVIEW LAST LEG FAULTED 22-11085 CHANNEL "A".  LRU REPLACEMENT TEST FOR VOR PASSES.  ACCOMPLISHED LAND VERIFY TEST.  TEST PASSES, REF B737-800 FIM 22-11 TASK 899.  HGS RECORDED NO HC OR FC FAULTS.  ACCOMPLISHED HGS SYSTEM TEST.  ALL TESTS PASS, REF FIM 34-36 TASK 899.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.