Service difficulty report · Actuator · Dhav DHC8301

Difficulty date
May 4, 2007
Submitted
June 7, 2007
Operation
General aviation
Make and model
Dhav DHC8301
Aircraft time
37,895 hours
Engine
Pwa PW123
Propeller
Hamstd 14SF*
Part
Actuator
Part number
85311176009
Condition
Cracked
Location
Nlg
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

(CAN) ON APPROACH, THE NOSE LANDING GEAR WOULD NOT EXTEND TO THE DOWN AND LOCKED POSITION. CREW DID A FLY-BY PASS THE ATC CONTROL TOWER, WHO CONFIRMED THAT THE GEAR WAS EXTENDED, BUT DID NOT APPEAR TO BE LOCKED. GEAR WAS CYCLED AND ALL (3) GEARS WERE CONFIRMED DOWN AND LOCKED. AIRCRAFT THEN LANDED WITHOUT FURTHER INCIDENT. AIRCRAFT WAS THEN FERRIED WITH GEAR PINNED DOWN TO A MAINTENANCE BASE FOR FURTHER INSPECTION AND REPAIR. THE FOLLOWING DAMAGE WAS FOUND. THE NLG UPLOCK ACTUATOR FITTING ASSY P/N 85311176-009 WAS FOUND CRACKED AT THE ACTUATOR ATTACH POINT. DISCOLORATION OF PART OF THE CRACK INDICATES PROPAGATION OCCURRED OVER A PERIOD OF TIME. RECOMMEND A MORE FOCUSED SPECIFIC VISUAL OR NDT INSPECTION OF THIS