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Jo's is 5500 feet above mean sea level, and with (southern hemisphere) summer temperatures it can become quite limiting for twin operations.
From what I hear the 340-300 wasn't much better!
Jon68, the 340-300 aircraft with hairdryers were so poor that during the J'burg summer B744 aircraft had to be used. The CFM56 things were frequently limited on EGT margin and hitting 950 - 960'C during t/off. Such that MC had all these engines on watch to keep the worst aircraft off this route until a core wash could be done to attempt to regain some margin. A battle never lost he said!
