SDR ASAA2016060516950

Service difficulty report · Autopilot Sys · Boeing 737890

Difficulty date: June 5, 2016
Submitted: June 7, 2016
Operation: Air carrier
Aircraft: N513AS
Make and model: Boeing 737890
Aircraft serial: 35192
Aircraft time: 29,753 hours, 8,961 cycles
System (JASC): 2200 · Auto Flight System
Part: Autopilot Sys
Condition: Malfunctioned
Location: B System
Stage of operation: AP
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

AUTOPILOT B DISENGAGED WHEN INTERMITTENT RA FLASHED BELOW 1,000 ON ILS APPROACH. ACFT GROUNDED. NO CURRENT FAULTS, LAST LEG SHOWED RADIO ALTIMETER DATA INVALID AT 1,295 FT. PERFORMED LRRA DFCS GROUP NR 40, NO DEFECTS NOTED. ALSO PERFORMED LAND VERIFY TEST, REF AMM 22-11-00/201. NO DEFECTS NOTED. ACFT REMAINS AUTOLAND CAT III QUALIFIED.