Service difficulty report · Unknown · Boeing 737890

Difficulty date
July 12, 2019
Submitted
July 16, 2019
Operation
Air carrier
Aircraft
N506AS
Make and model
Boeing 737890
Aircraft serial
35690
Aircraft time
41,787 hours, 12,787 cycles
Part
Unknown
Condition
Malfunctioned
Location
Autopilot Sys
Stage of operation
AP
How discovered
O
Nature of condition
N
Precautionary procedure
O

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

What was found

1) A/P ONLY DISCONNECT WITH MOMENTARY (1 SECOND) "VTK" ON CA (A) SIDE2) WAS NOT ABLE TO SEE ANY MESSAGE WITH RECALL3) CA (A SIDE) A/P REENGAGED NORMALLY. GROUNDED - YES. REF FIM 34-61 TASK 801, FMCS BITE SENSORS TESTED NORMAL, INFLT FAULT PAGE SHOWS LEFT FMC FAULT RESET ON FLT LEG 9 ONLY. REF FIM 22-11 TASK 801, DFCS BITE CURRENT STATUS OK W/O FAULTS. FAULT HISTORY SHOWS FAULT MSG CH-A "FMC DATA INV", LRU TESTS OK. DFCS FMC LRU REPLACEMENT TESTED GOOD. CURRENT STATUS NORMAL. ACCOMPLISHED LAND VERIFY BITE GP 49. NO FAULTS NOTED. NO OTHER RECENT HISTORY.