On Monday, 19 March 2018 03:41:01 UTC+13, wrote:
Hello David

What is the current status of certification process?

We have one Cessna 182 on our airfield and we are planning to buy next one and install the tow hook on it. I've looked for EASA STC but without any success. Is there any possibility to share your drawings and calculations?

Martin

We currently have a NZ Form 337 (Field Approval) on the 182/Tost tow hook. I need to check, and I understand the US/NZ Bilateral Agreement provides for US acceptance of NZ STC for Part 23 Airplanes.

Please allow me a couple of days to investigate; one way or another, I'm confident we can assist, either by completing a NZSTC, or supplying data to your DER for approval. Depending on your local FAA, it may even be permissible to assert compliance on the basis of AC43.13-2B, which presents a layout for a tow hook installation to a sheet metal airplane that we have used as the basis for our design.

First step. I'll work out how to post a couple of pictures.

David