Cue Presidents of the USA ...
"We're not gonna make it"
"No no we're not gonna to make it"
I could well have sung this as I staggered out of Maitland Airport's runway 26 on a day well north of 40C in an old 6 cylinder 172 just shy of gross.
Somehow I drifted left to avoid old mates lounge window half way up the hill while observing the cushions on his couch. This was while planning on going under the power lines and performing a controlled crash up the slope in a clear area. While this was going on and in a state of sheer panic I somehow managed to glance at my mate next to me, intending to give him a crash brief only to discover he was engrossed in a magazine and completely oblivious to the situation. A serious slow motion event, he never did get the brief.
Somehow we made it over the hill, but it took several hours afterwards for me to regain composure and it was an event I will never forget.
Some aircraft should definitely be grounded at 40C.