Service difficulty report · Actuator · Beech 99

Difficulty date
September 28, 2007
Submitted
November 14, 2007
Operation
General aviation
Aircraft
N4381Y
Make and model
Beech 99
Aircraft serial
U71
Aircraft time
39,704 hours, 58,598 cycles
Engine
Pwa PT6*
Part
Actuator
Part number
993880011
Part serial
319
Condition
Cracked
Location
Mlg
Stage of operation
AP
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

AFTER SELECTING GEAR DOWN ON APPROACH, THE PILOT NOTICED THAT HE DID NOT HAVE A GREEN (SAFE) INDICATION FOR THE NOSE GEAR. HE FOLLOWED THE EMERGENCY PROCEDURE TO PUMP THE GEAR DOWN BUT WAS UNABLE TO BUILD UP PRESSURE OR GET A GREEN LIGHT. PILOT THEN LANDED AND THE NOSE GEAR COLLAPSED. INVESTIGATION FOUND THAT THE LT MAIN GEAR ACTUATOR END CAP HAD CRACKED AND ALLOWED THE EMERGENCY SYSTEM FLUID TO VENT OVERBOARD, PREVENTING THE NOSE ACTUATOR FROM EXTENDING FULLY.

More about the Beech 99