Service difficulty report · Unknown · Boeing 737990ER

Difficulty date
August 6, 2016
Submitted
August 8, 2016
Operation
Air carrier
Aircraft
N471AS
Make and model
Boeing 737990ER
Aircraft serial
41703
Aircraft time
7,296 hours, 2,389 cycles
Part
Unknown
Condition
Malfunctioned
Location
Autopilot Sys
Stage of operation
LD
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

ACFT AUTO LANDED APPROXIMATELY 20-25' RT OF CENTERLINE. RUNWAY SYMBOLOGY WAS OFFSET IE: POINTING LEFT. ACFT GROUNDED. ACCOMPLISHED HGS FAULT REVIEW REF SMM 34-36-00. CURRENT NO FAULTS FOUND. ACCOMPLISHED FIM 22-11, TASK 825. FOUND FAULTS 22-11199 MACH TRIM 28 VDC PROBLEM. PERFORMED THE DIGITAL FLIGHT CONTROL SYS, DFCS, BITE PROCEDURE REF FIM 22-11, TASK 801, FAULT WAS INTERMITTENT. ALSO, FOUND FAULT 22-11334 LOGGED. PERFORMED THE DIGITAL FLIGHT CONTROL SYSTEM, DFCS, BITE PROCEDURE REF AMM 22-11, TASK 801, FAULT WAS INTERMITTENT. ACCOMPLISHED LT AND RT MMR ILS BITE PROCEDURE REF FIM 34-31, TASK 801, NO FAULTS FOUND. THIS CLEARS MEL 22-20B.