Originally Posted by
Monarch Man
It’s effectively the same thing in a transport Aircraft, but it’s reliant in all cases on the validity of the data input.
I use a good rule of thumb that works most times as a gross error check. Ultimately in Mil or Civ service we operate for the most part by numbers, but you can’t replace experience and the seat of the pants either.
BTW, my old bang seat Jet was underpowered with both engines in reheat!
You must have been flying the Jaguar !
In the V force we did an acceleration time check to 100 knots.
Much later I suggested a system which I named TOPIS, Take Off Performance Indicating System and the concept was published in the Internationl Journal Of Air Safety many years ago. Basically the display, driven by the FMC was to drive a bug on the ASI giving the required speed. Any significant shortfall required a stop.
I thought Emirates was pursuing such a system, which modern electronics should make easy, after their take off incident at Melbourne, due I believe, to the wrong weights being entered in the FMC