Service difficulty report · Autopilot Sys · Boeing 737890

Difficulty date
October 9, 2009
Submitted
October 12, 2009
Operation
Air carrier
Aircraft
N560AS
Make and model
Boeing 737890
Aircraft serial
35179
Aircraft time
12,104 hours, 3,826 cycles
Part
Autopilot Sys
Condition
Malfunctioned
Location
Cockpit
Stage of operation
AP
How discovered
O
Nature of condition
O
Precautionary procedure
K

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

What was found

AUTOLAND EVAL ATTEMPTED ON SEA 34L. A/P SEEMED TO PITCH DOWN A LITTLE TOO MUCH AT ABOUT 100' AGL SHOWING NO SIGNS OF CORRECTING. HGS GAVE "APP WARN" COUPLE OF SECONDS LATER. DISCONNECTED A/P AND LANDED MANUALLY. ATC SAID ILS 34L WAS OPERATING NORMALLY AND ILS CRITICAL AREA WAS CLEAR AT TIME. GROUNDED YES. MSG'S 22 11004 22 11006 22 11378 WERE RELATED TO ADIRUS NOT PASSING GRD TESTS. FAULT MSG 22 11822 RELATED TO L FMC AND OCCURRED IN FLT. PERFORMED FIM TASK 22 11 00 810 811 NO CURRENT MAINTENANCE MSG FAULT WAS INTERMITTENT. PERFORMED DFCS CURRENT BITE TEST CURRENTLY NO FAULTS. PERFORMED DFCS LRU REPLACEMENT TEST FOR ADIRU(BITE GRP 33) PRECAUTIONARY TEST PASSED.