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Inboard Aft Service Kit

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MCSK100 Flap Roller Service Kit for Cessna Aircraft
Stops flap arm wear! Prevents costly flap arm replacement

A permanent solution to the wear problem at the aft wide roller locations
Includes two stepped washers, a medium width roller and bushing
(Components are not sold separately)
Stepped washers interlock with bushing making installation easier
Replaces the aft wide roller and bushing
FAA-PMA/STC approved (Minor alteration - logbook entry only)
Also included in the flap roller kits for Cessna aircraft

Technical Background:
The flap rollers wear into the flap support arms on Cessna aircraft. This wear is caused by the flap rollers due to the asymmetric extension or retraction of the flap during flight. This asymmetry is caused by the inboard or outboard section of the flap leading the retraction or extension of the flap. Many factors, including rusty or damaged rollers or flap track imperfections, can contribute to this condition. This asymmetry causes the rollers to be pressed against the flap support arms (roller end loading) which, over time, causes damage to the flap support arms and structurally weakens the flap.

Cessna Service Bulletin SEB95-3 REV. 1 addresses this issue by calling for the inspection and repair or replacement of the support arms and rollers. SEB95-3 REV. 1 also requires the installation of stainless steel washers on each side of the forward rollers to reduce the wear between the roller and the support arms. SEB95-3 REV. 1, however, did not offer a preventative solution to the wear problem experienced at the aft roller locations. McFarlane Service Kit MCSK100 is a permanent solution that addresses the aft support arm wear problem.

Installation is considered a minor alteration and does not require the filing of FAA Form 337. Only a logbook entry is required for this STC. It is important that the Cessna Service Bulletin SEB95-3 is fully complied with before MCSK100 is installed.