A small ‘hat-hook’
The more recent stuff is noted. However, going back, perhaps 40-odd years, I am quite certain that I read a requirement for a 20kt pad to be accounted. I have some rather old UK AFMs tucked away and I suspect there will be something to guide me in the AFM wordiology. When I can locate the two manuals I have in mind I will have a dabble and see what might come to light. It remains that the OEM concerned may have adopted the figure unilaterally but, in the absence of a certification imperative, why would an OEM do so ?