Service difficulty report · Sequence Valve · Bombdr DHC8400

Difficulty date
April 1, 2015
Submitted
August 5, 2015
Operation
General aviation
Make and model
Bombdr DHC8400
Engine
Pwc PW150A
Part
Sequence Valve
Part number
48302
Condition
Failed
Location
Nlg
Stage of operation
AP
How discovered
O
Nature of condition
O
Precautionary procedure
O

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

What was found

(CAN) NLG WOULD NOT EXTEND ON APPROACH, ALTERNATE EXTENSION DEPLOYED WITHOUT ISSUE. OPS TEST OF THE NLG WAS CARRIED OUT, GEAR FAILED TO EXTEND. RESISTANCE CHECK OF THE SOLENOID SEQUENCE VALVE WAS FOUND OUT-OF-LIMITS. SOLENOID SEQUENCE VALVE WAS REPLACED. THE NLG ACTUATOR WAS ALSO REPLACED AS THE GLAND SEAL WAS FOUND PARTIALLY DISLODGED. OPS TEST OF LANDING GEAR WAS CONDUCTED PRIMARY AND ALTERNATE EXTENSION CARRIED OUT SATISFACTORILY.