Can I add trim adjustment to my throw over yoke?

If your single arm yoke bar does not have the provision for the trimer knob, you will have to find another bar. you cannot modify the yoke bar to add the trimmer.

Curtis Boulware
ABS Tech Rep

Curtis is correct, of course. You need to find another control arm that includes provision for aileron trim.

The control arm without the aileron trim control is applicable to Barons, Travel Airs, and 1947-1957 Bonanzas. All others require the control arm with aileron trim which, because it is a certified part of the airplane's control system, MUST be installed.

Dr. Gorsky's question came up a day or so ago from Mr. Steele, about how to identify if a single arm would accept the trimmer installation. Curtis' answer was technically correct, but I don't see it as required equipment for Dr. Gorsky's serial number aircraft.

TCDS 3A15, item 603, is the ATC-35 aileron trimmer, Item 603 is not listed as required equipment for either Dr. Gorsky's or Mr. Steele's aircraft.

The ATC-35 trimmer is in the V35 IPC as an ATC-35-107 applicable to D8336 & after, 35-380072-1 is listed in the 33 IPC for S/N CD1062 & after.

Textron's parts website supersedes the ATC-35 with the ATC-35-107, then to the 35-380072-1.

These are optional equipment items. The answer to Dr. Gorsky's question "Is it possible to add trim adjustment to my throw over yoke or must I find another yoke? If so, where might I find one?" would be the same answer I gave Mr. Steele, basically if there is a center hole with three 8-32 tapped holes symmetrically around it, it likely would accept the trimmer. Textron is showing stock on the 35-380072-1, at a list price of $2800.00+. The used market may also have them.