Thu, Aug 05, 2010
Elevator Cables May Become Slack, Causing Premature Wear
The WACO Classic Aircraft Company has issued a service bulletin
for its YMF WACO F5A, SN F5001- F5009; YMF WACO F5B, SN
F5010-F5036; and YMF WACO F5C, SN F5C040-F5C122, for elevator cable
wear due to the cables becoming slack.
WACO Classic Elevator Cable Pulley Assembly
According to the service bulletin posted on the company's
website, the down elevator cable of a YMF WACO F5C has been found
to be worn and frayed resulting from a lack of adequate cable
tension. It has been determined that due to the in flight forces on
the elevator cable system, inadequate cable tension can result in
the down cable becoming slack allowing it to come into contact with
the stainless steel guard located below the pulley set at aircraft
station 212 located approximately 50 in forward of the rudder hinge
line in the lower aft fuselage. Although, when properly tensioned,
the cable is unlikely to come in contact with the guard, an unsafe
condition can develop without the operator being aware. Because
this is a possibility, all affected aircraft are to be inspected
and modified in accordance with this service bulletin. To prevent
possible damage to the elevator cables, a new pulley guard is
available that incorporates a Delrin rub strip between the pulley
rim and the stainless steel bracket. This rub strip will prevent
cable wear should the cable tension not be properly maintained
allowing the cables to sag.
On the website, the company has posted illustrated instructions
for determining if cables have become too slack for safe operation
of the airplane. If it is determined that the airplane needs
repair, a new pulley guard is available from WACO Classic at no
charge to the owner.
WACO Classic says that all of the airplanes with serial numbers
listed above should be inspected before the next flight using the
methods described on the website. At the next 100 Hr or Annual
Inspection, the necessary repairs, if any, should be made. WACO
Classic says the technical content of the Service Bulletin has been
shown to comply with the applicable Federal Aviation Regulations
and is FAA approved.
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