Service difficulty report · Autothrottle Sys · Boeing 737890

Difficulty date
October 25, 2014
Submitted
October 27, 2014
Operation
Air carrier
Aircraft
N557AS
Make and model
Boeing 737890
Aircraft serial
35176
Aircraft time
32,168 hours, 9,506 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

DURING CLIMBOUT, ABOUT 8,000 FT, BOTH ENGINE THRUST LEVERS REDUCED FROM 95.7 N1 TO 75 N1. NO OTHER LIGHTS OR MALFUNCTIONS OCCURRED. AUTO THROTTLE WAS DISENGAGED, THRUST REAPPLIED. AUTO THROTTLES WERE REAPPLIED. ACFT GROUNDED. AUTOTHROTTLE COMPUTER LOGGED NO FAULTS. NR 1 & NR 2 DFGC'S LOGGED NO FAULTS. NR 1 AND NR 2 EEC'S LOGGED NO FAULTS. AUTO THROTTLE SYS OPS CHECK GOOD. IAW MM 22-31-00. NR 1 & NR 2 EEC'S PASSES ALL TESTS, IAW MM 73-21-00. NR 1 & NR 2 DFGC'S SYSTEM PASS LAND VERIFY TESTS. IAW MM 22-11-00. LWMP STATUS REMAINS CAT111A AUTOLAND & HGS.