inverted Schweizer towhook

Definitions provided in 14 CFR Part 1.1 state, “Major alteration means an alteration not listed in the aircraft, aircraft engine, or propeller specifications—

(1) That might appreciably affect weight, balance, structural strength, performance, powerplant operation, flight characteristics, or other qualities affecting airworthiness; or

(2) That is not done according to accepted practices or cannot be done by elementary operations.�

Note that Advisory Circular 43.13-1b/2b, which is by definition acceptable data, covers basic tow hook installation. Flipping the hook-- arguably a removable, already installed appliance that effectively changes nothing on the airframe itself-- isn't a major mod. Since Schweizer isn't around anymore to adjudicate, just do it if you're convinced it's safer. Or better yet, buy the Tost.

Larry Ruggiero A&P/IA, tow pilot

My gliding club still has not got FAA approval to invert the current Schweitzer towhooks on their two Pawnees. The reasons are too complex to describe, but I feel it would help if we had photos of FAA approved inverted Schweitzer towhooks installed on Pawnees, showing exactly how it was done. Can anyone send me such photos? The more the better. Thanks in advance. Send any photos to raxyloid then gmail then com.

On Sunday, August 23, 2020 at 3:16:29 PM UTC-7, NEW YEARS RESOLUTION 2010 MOCIUNPICTURES wrote:
My gliding club still has not got FAA approval to invert the current Schweitzer towhooks on their two Pawnees. The reasons are too complex to describe, but I feel it would help if we had photos of FAA approved inverted Schweitzer towhooks installed on Pawnees, showing exactly how it was done. Can anyone send me such photos? The more the better. Thanks in advance. Send any photos to raxyloid then gmail then com.

You’re probably going to spend more money trying to get the Schweitzer hook inverted than just buying the Tost hooks.

On Sunday, August 23, 2020 at 3:16:29 PM UTC-7, NEW YEARS RESOLUTION 2010 MOCIUNPICTURES wrote:
My gliding club still has not got FAA approval to invert the current Schweitzer towhooks on their two Pawnees. The reasons are too complex to describe, but I feel it would help if we had photos of FAA approved inverted Schweitzer towhooks installed on Pawnees, showing exactly how it was done. Can anyone send me such photos? The more the better. Thanks in advance. Send any photos to raxyloid then gmail then com.

I'm still trying to find a copy of the 337 for inverting a Schweizer towhook on a Pawnee. It seems I need a N number for the FAA to track down a copy of the 337. The 1996 article attached says a 337 was granted by the FAA, and I suspect this was for the Pawnees operating at Turf. Does anyone know the N numbers of the Pawnees operating in the 90s at Turf?

https://www.dropbox.com/s/bsp9r0oj2n...hooks.doc?dl=0

Rick Brown at the Pleasant Valley Airport in Peoria, Arizona knows. I don't know if he will help you tho.....

Boggs

On Saturday, October 3, 2020 at 4:16:29 PM UTC-7, Waveguru wrote:
Rick Brown at the Pleasant Valley Airport in Peoria, Arizona knows. I don't know if he will help you tho.....

Boggs

thanks Boggs. Anyone who wishes to, can reply to me privately at axyloid at icloud dot com