Service difficulty report · Actuator · Dhav DHC8202

Difficulty date
January 18, 2012
Submitted
September 14, 2015
Operation
General aviation
Make and model
Dhav DHC8202
Engine
Pwa PW123D
Propeller
Hamstd 14SF23
Part
Actuator
Part number
MB543DDFS464
Condition
Failed
Location
Spoilers
Component
Spoiler Servo A · Ge · A44700009
Stage of operation
NR
How discovered
9
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) DURING THE TROUBLESHOOT OF A NON-ROUTINE DEFECT ROLL SPOILER PUSH-OFF NR 2 ILLUMINATED, IT WAS DETERMINED THAT BEARING ON THE OUTBOARD SPOILER SERVO ACTUATOR ASSEMBLY WAS SEIZED. AS A RESULT OF THE SEIZED BEARING, ARM WAS FLEXING AND WAS PROVIDING A CHANGE IN GEOMETRY NOT ALLOWING FULL TRAVEL OF THE SPOILERS. ADDITIONALLY, UPON FURTHER INSPECTION OF THE NR 1 OUTBOARD SPOILER SERVO ACTUATOR REVILED THE SAME BEARING SEIZED AS WELL. THE ACTUATORS WERE REMOVED AND THE BEARINGS REPLACED, INSPECTION OF THE ARMS FOUND NO CRACKING. THE ACTUATORS WERE INSTALLED AND THE SYSTEM CHECKED SERVICEABLE.