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6 votes

On average, how much fuel is left in commercial flights after landing?

For a 737, between 5,000 and 8,000 lbs of fuel left at landing is fairly typical. For a short flight in good weather to an airport with multiple runways and nearby divert fields, the lower value is ...
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3 votes

On average, how much fuel is left in commercial flights after landing?

The usual reserve is 10%. On QF9 Perth to London we depart with 110,000 litres and land with between 8,000 to 10,000 litres remaining.
  • 31
2 votes

What is the role of HP & LP fuel pumps in aircraft?

In general LP pumps supply fuel to the engine from the fuel tank. HP pumps supply fuel to the injectors. This principle works not only for aircrafts but even on modern cars. It's sometimes possible ...
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8 votes

What is the role of HP & LP fuel pumps in aircraft?

The question asks about all low pressure fuel pumps on commercial aircraft but the diagram depicts only one specific instance (of a two stage high pressure pump) and is confusingly labeled. The low ...
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1 vote

At what point does a turboprop become more fuel efficient than a jet engine in large commercial aircraft?

Is there a formula that can be reliably used to determine when turboprops become the better option A formula not but an indicative plot yes. The 5th slide of this presentation (slide that I repost ...
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0 votes

At what point does a turboprop become more fuel efficient than a jet engine in large commercial aircraft?

There isn't a one-fits-all formula. It would depend mostly on the distance between the city pairs you want to fly between. Turboprops have lower seat-mile costs, but are slower (the fastest one, the ...
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