Service difficulty report · Sequence Valve · Boeing 757351

Difficulty date
January 1, 2026
Submitted
January 2, 2026
Operation
Air carrier
Aircraft
N594NW
Make and model
Boeing 757351
Aircraft serial
32994
Aircraft time
75,781 hours, 25,076 cycles
Part
Sequence Valve
Part number
4334EA3
Part serial
122012
Condition
Failed
Location
Zone 700
Part time
75,775 hours, 25,073 cycles
Stage of operation
AP
How discovered
O
Nature of condition
J
Precautionary procedure
L

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

What was found

CREW PERFORMED GO AROUND AND ALTERNATE GEAR EXTEND DUE TO RIGHT GEAR NOT SHOWING DOWN AND LOCKED. R & R RT UPLOCK, MAIN GEAR DOOR ACTUATOR, AND DOWN LOCK SEQUENCE VALVE.