Hi George,
Not sure if you have seen it, but NZ Ag Beavers had a mod on the flap handle designed so if you ever had to pump flaps in a hurry, they went down. It was a simple lever on the flap handle just like a brake lever on a bike, flaps only came up if you squeezed the lever. Must have been a few incidents on Ag as you can imagine with having flap selector in wrong position. Think it was a Fieldair mod. Two Beavers I have been connected with and others I have seen all had the mod, even for civil use.
A google search reveals a company called Stolairus Aviation in the US seems to have copied the idea and have STCd it in the States, Canada pending.
Last edited by Weheka; 3rd Feb 2018 at 00:15.