Service difficulty report · Sequence Valve · Dhav DHC8301

Difficulty date
January 19, 2013
Submitted
September 14, 2015
Operation
General aviation
Make and model
Dhav DHC8301
Engine
Pwa PW123
Propeller
Hamstd 14SF23
Part
Sequence Valve
Part number
54C54634
Condition
Failed
Location
Mlg
Stage of operation
DE
How discovered
O
Nature of condition
K, J
Precautionary procedure
A

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

What was found

(CAN) IN FLIGHT AFTER THE LANDING GEAR WAS SELECTED DOWN THE NR 2 ENGINE HYD PUMP CAUTION LIGHT, CAME ON. WITH LOSS OF HYD PRESSURE AND QTY OF THE HYD SYSTEM NR 2. DURING POST FLIGHT INSPECTION WE FOUND SEQUENCE SOLENOID VALVE WAS BROKEN, 3 OF 4 THE COUPLING BOLTS WERE SHEARED. ALL ASSOCIATED FILTERS CHECKED NO CONTAMINATION. THE EDP WORKED FOR MORE THAN 34 MINUTES WITHOUT FLUID, NO EDP CASE DISCOLORATION FOUND BUT REPLACED. THE VALVE REPLACED. THE ACFT HAS BEEN RETURNED TO SERVICE.