Service difficulty report · Autopilot Sys · Boeing 757251

Difficulty date
March 20, 2018
Submitted
March 20, 2018
Operation
Air carrier
Aircraft
N557NW
Make and model
Boeing 757251
Aircraft serial
33393
Aircraft time
45,832 hours, 20,055 cycles
Part
Autopilot Sys
Condition
Tripped
Stage of operation
AP
How discovered
O
Nature of condition
F
Precautionary procedure
O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

ALL THREE AUTOPILOTS TRIPPED OFF DURING APPROACH. COMPLETED MCDP TEST 30, AND TEST 40 ,AUTO LAND IAW FIM 22-00-03, NO FAULTS NOTED.