Indeed oldebloke, information that is quite valuable when the chips are down...on slippery runways.
The Lockheed TriStar for example, had
complete handling info with reverse on slippery runways, in the AFM.
Can recall a couple of co-pilots who wanted to know about this, so I referred 'em to the big thick manual that said 'Lockheed California Company' on the cover...worked like a charm.
Those that made it up as they went along....ended up in the weeds.
