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Trim Tab Overhaul Requirement

Posted by AskBob on 04.27.12 at 02:30 PM

The intent of the requirement is to assure that a serviceable and well maintained actuator is installed on the airplane.

Cessna configured early maintenance manuals in a General Aviation Manufactures Association (GAMA) format, and later adopted the Airline Transport Association (ATA) format. Section 2: Ground Handling, Servicing, Lubrication and Inspection - is where the inspection/overhaul requirement will be located in the GAMA manuals. In ATA manuals, it is in Chapter 5, Time Limits/Maintenance Checks. The overhaul requirement of 1,000 hours or three years, whichever comes first, is the most common across the model line, although some early manuals contain an inspection and lubrication requirement at a 100 hour or annual interval and no overhaul requirement.

The overhaul of a trim tab actuator is not specifically defined in every Cessna maintenance manual. Cessna considers this requirement to be met when the trim tab actuator is disassembled, cleaned, inspected, worn components replaced, reassembled with fresh lubrication, and then tested. If a trim tab actuator has been determined to be beyond economical repair or the servicing facility does not have the capability to overhaul the actuator, it can be replaced to meet the three year or 1000 hour overhaul requirement. The actual overhaul task information is found Section 9 of the GAMA manuals, and Chapter 27 of the ATA formatted manuals, when it is incorporated.

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mike james (not verified) on Mon, 05/14/2012 - 12:28

We are going through the same issue. This requirement is conisdered to be recommended unless the aircraft is to be operated under a 135 certificate and the operator elected to operate under the OEM recommended program instead of AAIP. We have elected on the aircraft that are not operated under 135 to check these actuators as 'On-Condition'. With the cost of new at $1876 as an outright the best case would be to overhaul but if it looks that bad buy the exchange. The actuator is probably out of warranty and it is easy enough to pull them apart to look for excessive corrosion and wear. Do you really need another shop to tell you how bad they look?

Hope that helps.
Mike James, DOM

Fernando (not verified) on Tue, 10/11/2016 - 04:39

Dear Mike,

Do you know any place to service my elevator trims in Florida?

Thanks

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