Service difficulty report · Fork · Hiller UH12E

Difficulty date
January 25, 2010
Submitted
January 25, 2010
Operation
General aviation
Make and model
Hiller UH12E
Part
Fork
Part number
521103
Part serial
11566P
Condition
Damaged
Location
Main Rotor
Stage of operation
IN
How discovered
V
Nature of condition
O
Precautionary procedure
K

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

What was found

FOUND DURING AN INCOMING INSPECTION THE FOLLOWING DEFECTS ON 4EA NEW FAA PMA PARTS SN 11566P/11567P/ 11568P & 11569P AS FOLLOWS; EDGE RADIUS OF ALL FORK BLADE PIN BORES DO NOT HAVE A SUFFICIENT RADIUS TO LET BLADE ATTACHMENT PIN TO SEAT AGAINST THE TOP SURFACE OF THE UPPER FORK TANG, WITH PIN INSERTED, MEASURED BETWEEN .008" TO .011" GAP UNDER HEAD OF PIN. TO INSERT BLADE PIN THROUGH EACH FORK, THE FORK HAD TO BE SPREAD APART RANGING FROM .004" TO .012". BEFORE SPREADING THE FORK, FOUND ALL FORK TANGS TO BE PARALLEL.

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