SDR CALA2016121901091

Service difficulty report · Sequence Valve · Boeing 757224

Difficulty date: December 16, 2016
Submitted: December 20, 2016
Operation: Air carrier
Aircraft: N57111
Make and model: Boeing 757224
Aircraft serial: 27301
Aircraft time: 90,325 hours, 19,041 cycles
System (JASC): 3230 · Landing Gear Retraction/Extension System
Part: Sequence Valve
Part number: 2670296M1
Part serial: 1547
Condition: Unserviceable
Location: Nlg
Part time: 49,075 hours, 9,726 cycles
Stage of operation: AP
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

GEAR DISAGREE ON EICAS, HAD TO MANUALLY OVERRIDE TO LOWER NOSE GEAR PER QRH. PERFORMED NORMAL OPERATION CHECK OF MLG NUMEROUS TIMES WITH NO FAULTS OR ABNORMAL OPS, REF AMM 32-32-00. PER TOMC REQUEST REMOVED AND REPLACED NLG OPERATED SEQUENCE VALVE, REF AMM 32-34-06, OPS CHECK GOOD.