SDR ASAA2021042034627

Service difficulty report · Autoland Sys · Boeing 737890

Difficulty date: April 20, 2021
Submitted: April 23, 2021
Operation: Air carrier
Aircraft: N535AS
Make and model: Boeing 737890
Aircraft serial: 35200
Aircraft time: 37,628 hours, 10,833 cycles
System (JASC): 2210 · Autopilot System
Part: Autoland Sys
Condition: Malfunctioned
Stage of operation: LD
How discovered: O
Nature of condition: F
Precautionary procedure: O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

AUTOLAND NOT SUCCESSFUL AIRCRAFT DID NOT FLARE. REQUIRED CORRECTIVE ACTION. GROUNDED - YES. UPON BITE DFCS SHOWS NO ACTIVE FAULTS WITH NO HISTORY. HGS BITE REF SMM 34-36-00 NO ACTIVE FAULTS AND SHOWS FAULTS "ROLLOUT GUIDANCE AND ILS ANOMALY" IN HISTORY WITH ONLY ONE LEG EFFECTED. PERFORMED DFCS BITE LIBRARY TEST REF B737-800 AMM 22-11-00-740-814 ALL TEST PASS. LAND VERIFY REF AMM 22-11-00-700-801 TEST PASS. HGS OPERATIONAL TEST AND SYSTEM TEST REF SMM 34-36-00 ALL PASS WITH NO FAULTS.