Gaunty:
Yes, conditions would be hot, usually +54C or more and sea level.
We would use flaps 20 for T/O as it was company police. The 747 climbs better with F-10 for T/O. Yet to save tires we used the higher flap setting and when it was time for clean up at 1000' or so, we would spend as much as 5 minuttes just sitting there, unable to accelerate or climb.
(Well, we would somehow get out of it by being patient or lucky, but it was a strange situation, yet it happened every time on really hot days and we were maxed out)
It would not have been a problem if we had used the lower flap setting. I did normal F-10 T/Os in Saudi for a different company and under similar met conditions, never had
a problem.
Inversion at 1000 feet? It could have been a layer of hotter air that robbed us of performance, but can not swear to it.
It was 7 years ago and my memory is somewhat teflon coated.
Iceman49: Ah, roger on the 17R engines giving higer boost: From some after burner arrangment or just more fuel into the fuel control unit?
------------------
Men, this is no drill...
[This message has been edited by TowerDog (edited 23 December 2000).]