Tail Spring Mounting Problems Visited: Reference Drawing #19

Source: 2009 Q1 Beartracks, Bob Barrows09q1tailspring
Some Bearhawk aircraft are having problems with the tail spring getting loose on the airframe attach points
and/or having the tailwheel becoming loose to the tail spring. Please check your aircraft.
09q1tailspring2The AN7 bolt holding the front of the spring goes thru a 5/8” O.D. X 7/16” I.D. Tube. The tail spring sets on this tube which is welded to the tail wire attach plate. You may need a washer to spread the load between the 5/8” tube and the tail spring onto the attach plate. Also, it would be good to have a washer under the head of the bolt at the bottom of the spring. The washer should be about 7/8” - 1.00” O.D. And 1/16” - 3/32” thick. The attachment at the tail post is by a 'U' clamp using (2) AN4 bolts. The 'U' clamp should lightly clamp the spring.
The spring clamp ears should not be bent when the AN4 bolts are fully tightened. Use shims between the tail post fitting and the clamp ears. The tail wheel is attached to the tail spring by a AN7 bolt. There should be a 1” O.D. X 3/32” to 1/8” thick (4130) washer on the underside of the tail spring. Tighten this AN7 bolt up to full torque.

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