Service difficulty report · Autothrottle Sys · Boeing 737890

Difficulty date
September 19, 2017
Submitted
September 22, 2017
Operation
Air carrier
Aircraft
N514AS
Make and model
Boeing 737890
Aircraft serial
35193
Aircraft time
34,279 hours, 10,311 cycles
Part
Autothrottle Sys
Condition
Malfunctioned
Stage of operation
TO
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 TAKEOFF, TOGA WAS SELECTED, THROTTLES ADVANCED NORMALLY TO APPROXIMATELY 95 PERCENT N1. THE LEFT THROTTLE CONTINUED TO 99.5 PERCENT N1 WHILE THE RIGHT THROTTLE STOPPED AT 95.5 N1. AFTER APPROXIMATELY 5-6 SECONDS ADVANCED RIGHT THROTTLE TO 99.5 N1 TO MATCH THE LEFT THROTTLES. FUNCTIONED NORMALLY FOR REST OF FLIGHT. ACFT GROUNDED. PERFORMED AN AUTOTHROTTLE BITE IAW FIM 22-31, TASK 801. NO CURRENT STATUS FAULTS NOTED. ACCOMPLISHED ALL DFCS BITE GROUP 60 LIBRARY TESTS IAW AMM 22-11-00-740-806 AND AUTOTHROTTLE SYSTEM TESTS IAW AMM 22-31-00-710-802. ALL DFCS BITE TESTS PASSED AND AUTOTHROTTLE SYSTEMS TESTS PASSED.