Service difficulty report · Autothrottle Sys · Boeing 737890

Difficulty date
November 13, 2012
Submitted
November 16, 2012
Operation
Air carrier
Aircraft
N586AS
Make and model
Boeing 737890
Aircraft serial
35189
Aircraft time
19,588 hours, 6,219 cycles
Part
Autothrottle Sys
Condition
Malfunctioned
Stage of operation
CR
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

DURING CRUISE FLIGHT, THE THRUST MODE DISPLAY INDICATED A/T LIMIT IN A WHITE BOX. DURING DESCENT, THE DISPLAY BECAME NORMAL GREEN CRUISE AS SOON AS THE A/T MODE CHANGED TO ARM. DURING LEVEL OFF, THE TMD AGAIN SWITCHED TO WHITE A/T LIMIT. ACCOMPLISHED FIM TASK 22-31 TASK 801 AUTOTHROTTLE BITE IN FLT FAULT MESSAGE 22-31411 EEC 1B. ACCOMPLISHED FIM 22-31 TASK 806 EEC FAULT ISOLATION EEC BITE 73-00 TASK 801 NO MESSAGE IN CURRENT STATUS. CONSIDERED AN INTERMITTENT FAULT OK FOR SERVICE.