Page 4 of the "Flight Crew Brief", the one on how to do the performance data card & stuff.
The bottom paragraph says "An OAT greater than 44°C will require one PACK to be on during take-off."
See, I
doread stuff!
FWIW, I looked at the EGT's today and saw the difference between none and three on was about 10°C EGT.
The Hajj is okay, I just got back from my last Jakarta trip. We'll be here for around a week or so longer fo Saudia. Can't wait to get home ...