Cessna R172K & 175's with STC SA383GL, Ralph Bolen Tailwheel Kit UPN

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Cessna R172K & 175's with STC SA383GL, Ralph Bolen Tailwheel Kit UPN

Unapproved Parts Notification

Cessna Models R172K, 175, 175A, 175B and 175C with the STC SA383GL, Ralph BolenConventional Gear (tailwheel) Conversion Kit, installed which were sold and/or supplied by Robert and/or Barbara Williams.


This notification advises all aircraft owners, operators, manufacturers, maintenanceorganizations, and parts distributors regarding Ralph Bolen Conventional Gear (tail wheel)Conversion Kit produced without Federal Aviation Administration (FAA) productionapproval.


Information received during an FAA suspected unapproved parts investigation revealed that Robert and/or Barbara Williams, Avcon Conversions, (aka, TDM, Inc.) 117 E. First Street,Udall, KS 67146, represented and sold an unapproved Ralph Bolen Conventional Gear (tailwheel) Conversion Kit for STC SA383GL, as suitable for installation on a type certificatedproduct without FAA manufacturer approval.

Evidence indicates that five (5) of the parts in the STC SA383GL kit did not meet the FAAapproved type design. These part numbers are: P/N 175-91, Bracket – Control (RH), P/N 175-30, Bracket –Tail (LH), P/N 175-39, Spring Leaf, P/N 175-37, Spring Leaf and P/N 175-30,Bracket – Tail (RH).


Regulations require that type-certificated products conform to their type design. Aircraft owners, operators, manufacturers, maintenance organizations, and parts suppliers and distributors are encouraged to inspect their aircraft and/or parts inventories for the referencedpart numbers. If STC SA383GL kits and/or parts are found in existing inventory, it isrecommended that they be quarantined to prevent installation until a determination can be made regarding their origin and eligibility for installation.


You can obtain further information concerning this investigation from the FAA Manufacturing Inspection District Office (MIDO) listed below. In addition to the above recommendations, the FAA would appreciate any information concerning any discovery of the above-referenced STC SA383GL kits and/or parts from any source, the means used to identify the source, and the actions taken to remove the STC SA383GL kits and/or parts from aircraft and/or parts inventories. This notice originated from the FAA Wichita MIDO, 2204 S. Tyler Rd., Wichita, KS 67209, Telephone (316) 946-4179, Fax (316) 946-4189.





No.: 2012-20111221009

Date: November 19, 2012


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kishore patel (not verified)
Anonymous's picture

i bought a couple of kits for the cessna 150 from Barbara & bob williams. how do i know they were approved?

AskBob's picture

You might call the FAA MIDO (316) 946-4179 for more details

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