DESCRIPTION OF TYPE DESIGN CHANGE:

Replacement of original “T” style control yoke with “Y” style control yoke. Applicable part numbers are listed in
General Aviation Concepts Document No. GAC – DOC – 17X-1 Rev. Original, dated April 20, 2018, or later FAA
approved revision. Installation is to be accomplished in accordance with General Aviation Concepts Document No.
GAC – DOC – 17X-1 Rev. Original, dated April 20, 2018, or later FAA approved revision.

Limitations and Conditions:
1) The installer must determine whether this design change is compatible with previously approved modifications.
2) If the holder agrees to permit another person to use this Certificate to alter the product, the holder shall give the other
person written evidence of that permission.
3) The FAA has determined that no additional Instructions for Continued Airworthiness are required for this STC.
This certificate and the supporting data which is the basis for approval shall remain in effect until surrendered, suspended, revoked or a termination date is otherwise established by the Administrator of the Federal Aviation Administration.

This certificate and the supporting data which is the basis for approval shall remain in effect until surrendered, suspended, revoked or a termination date is otherwise established by the Administrator of the Federal Aviation Administration.

Date of application: April 15, 1992

Date of issuance: April 29, 1992

Date reissued: April 11, 2018; April 13, 2018;

Date amended: May 21, 2019

General Aviation Concepts
3033 Taxilane A
North Pole, AK 99705
A-799, 3A12, and 3A17
Cessna
170, 170A, and 170B
172, 172A, 172B, 172C, and 172D
175, 175A, 175B, 175C, and P172D
Date reissued: April 11, 2018; April 13, 2018;

Date amended: May 21, 2019
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