Long ago, I used to teach pilots transitioning into 727 airliners.
They were out of a Cessna or Piper airplanes, even Citations.
Was in USA, so then, I used pounds per hour fuel burn.
So, I used to lecture in the classroom, like this -
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The 727 at sea level burns 2200 lbs FF per engine to fly at 220 knots (IAS).
A certain fuel flow gives you a certain IAS... we just deduct a 0...
At sea level, as mentioned above, IAS equals TAS.
At 35,000 feet, a fuel flow of 2700/engine still gives you 270 knots IAS.
But up there, 270 KIAS becomes some 470 KTAS.
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If of any interest to you - not trying to confuse the issue here...
A 727 has 3 engines, so flying at 250 KIAS, sea level, burns a total of 7500 lbs.
Let us fail an engine...
So, how much fuel flow needed on 2 remaining engines to fly at 250 KIAS...?
Same total fuel flow... that is 7500 lbs total burn.
But this time, with 2 engines, it is 3750 FF per engine to get 7500 FF total.
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See, you have to be a brain surgeon or rocket scientist to be airline pilot.
Of course, with the JAR fATPL exams, takes a week to learn the above science.
These guys would correct me to read that it takes 3751.5 lbs FF/engine.
And advise me that "their FMS this and that..." -
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Hey,
Intruder, is the wine a Haut Médoc, or a St. Emilion 1971...?
Happy contrails