No idea re temp sorry ,can just say that the ambient temp here atm is about as high as it
ever gets-only around 80 degrees F though-and the packs are nicely warm to the touch after a flight but not uncomfortably hot.
Interestingly,when we were doing the static full-throttle (pre-flight) rpm checks asked for by OhD, the full 6000-6100 rpm was only reached after two,or three, 4 second bursts-presumably, even at around70-80 * F ambient, the packs need to warm up a little to give their all?