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Tow Hook on Cessna 180 - Update
Thanks for all the private responses. I don't have everything needed
for a legal installation yet but I am now relatively certain it is possible. Neal Pfeiffer was kind enough to put me in touch with Charles Pate at Cessna's Structural Engineering Department. Charles directed me to the FAA's Advisory Circular 43.13-2A figure 8.9 which is online at: http://www.airweb.faa.gov/Regulatory...visoryCircular ..nsf/1ab39b4ed563b08985256a35006d56af/e533bb05389c90e486256a54006e47b2/$FILE /Chapter%201-8.pdf If it wraps cut and paste it as required to make a link. It gives general guidelines for installing tow hooks on tailwheel and tricyle gear airplanes. He also forwarded a document file which described Cessna's testing of 100 series aircraft for towing and how nearly all structurally handle 1,200 lbs x 150% at various tow angles. This document is probably available on letterhead from Cessna's Structural Department. Allow at least a couple of weeks if you need a copy. Mr. Pate also sent photos of an installation he saw in Texas. The best information he sent were some unofficial copies of the Javelin Aircraft STC for the tow-hook installation. He said that David Blanton Sr. who passed away a few years ago donated the tow-hook STC to the SSA. The STC drawing shows how to fabricate a steel bracket that connects to the tailwheel using longer versions of the original through-bolts. It is a very clean installation. I have been told Gasser Banner can supply the bracket and the Schweizer hook. I have contacted the SSA about purchasing the STC and Gasser Banner about getting the Bracket and Hook. Interesting that the Javelin STC uses a nylon cord running from the hook along the outside of the fuselage through the pilot side window tied to the "assist strap" with a specified amount of slack. To release the tow line you pull on the cord. Seems like a very elegant solution - especially if you only plan on towing ocassionally. I hope the SSA has its act together enough to market the STC. Hope this will be helpful to someone else in the future. |
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