Service difficulty report · Autothrottle Sys · Boeing 737890

Difficulty date
July 8, 2017
Submitted
July 10, 2017
Operation
Air carrier
Aircraft
N538AS
Make and model
Boeing 737890
Aircraft serial
41188
Aircraft time
20,379 hours, 5,945 cycles
Part
Autothrottle Sys
Condition
Malfunctioned
Stage of operation
CL
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

ON DEPARTURE, NOTICED AN N1 SPLIT UPON TOGA SELECTION WITH AUTOTHROTTLES ON APPROX 1%. CONFIRMED THAT FMC COMMANDED VALUES WERE SET BY THE AUTOTHROTTLES. UPON SELECTION OF N1 MODE DURING CLIMB THE FMC COMMANDED VALUES MATCHED UP AS NORMAL AND SYSTEM PERFORMED NORMALLY FOR THE REMAINDER OF THE FLIGHT. ACFT GROUNDED. PERFORMED EEC BITE IAW FIM 22-31 TASK 806 AND AVM BITE 77-31 TASK 801. SHOWS NO FAULTS, NO HISTORY ( ON AVM) DID NOT EXCEED ANY ENGINE PARAMETERS. OK FOR SERVICE.