SDR UIEA2026021500052

Service difficulty report · Sequence Valve · Boeing 747409F

Difficulty date: February 13, 2026
Submitted: February 16, 2026
Operation: Air carrier
Aircraft: N439GT
Make and model: Boeing 747409F
Aircraft serial: 30767
Aircraft time: 99,329 hours, 18,080 cycles
System (JASC): 3230 · Landing Gear Retraction/Extension System
Part: Sequence Valve
Part number: 60B002201
Part serial: 2106
Condition: Faulted
Location: Zone 700
Stage of operation: CL
How discovered: O
Nature of condition: J
Precautionary procedure: A

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

What was found

GEAR WOULD NOT STAY UP WITH THE LANDING GEAR HANDLE IN THE UP POSITION. MOVED HANDLE TO THE OFF POSITION WHILE INDICATING UP, AND GEAR REMAINED UP INSTEAD OF DROPPING. R & R NOSE GEAR SEQUENCE VALVE IAW AMM 32-34-07-004-001, 32-34-07-404-006 & IPC 32-34-07-02. LEAK AND OPS CHK GOOD. GEAR SWING IAW AMM 32-34-00-715-036, 32-33-00-715-071 & 32-32-00-355-046, NO DEFECTS NOTED.