Originally Posted by
john_tullamarine
In an emergency (and I think a flight instruments problem qualifies, albeit with a reasonably routine fix), I don't think that anyone is going to be too critical if one holds onto a high thrust setting for a while longer than usual ?
Good point - the primary advantage of 10 minute takeoff is for planning - i.e., higher max TO weight if you need to account for a more distant terrain clearance.
If it's an emergency, use whatever thrust you have available (one of the early criticisms of FADEC was that it would normally prevent overboost in an emergency such as windshear when that extra thrust might make the difference). Of course, that rather assumes you have reasonably healthy engines. There was a Kalitta 747F crash back in the early 2000's where they lost an engine right at rotation - the pilot then pushed the throttles and overboosted the other three, one of which also failed due to the overboost (well used JT9Ds).