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quietflyr t1_jdv85t5 wrote

Reply to comment by MagnusNewtonBernouli in Does living in an airplane flight path, near an airport, pose a health risk? What happens to the lead from the jets fuel? by [deleted]

It's not used in airliner flights because that's not the fuel the engines were designed for.

Can a jet engine run on avgas? Probably, but it's probably not allowed by the certification of the aircraft, and thus is not allowed by the regulations. Some military aircraft have allowances for short runs using alternate fuels like avgas, actual kerosene, diesel, etc, but I doubt most civilian airliners have this option at all.

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MagnusNewtonBernouli t1_jdv99tb wrote

> Can a jet engine run on avgas?

Firstly, turbine not jet. And not only can they but it is in the maintenance manual and the POH/TO for the aircraft.

A plane I flew had this very limitation. 100 hours of operation on 100LL.

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quietflyr t1_jdvgu3m wrote

So when talking about airliners, we're mostly talking about jet engines, which, by the way, are a subclass of turbines.

And your aircraft type had the limitation, but I would guess most modern airliners would not have 100LL as an available alternative fuel at all. Did the airplane you flew have T56 engines?

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richalex2010 t1_jdvnrv9 wrote

> So when talking about airliners, we're mostly talking about jet engines, which, by the way, are a subclass of turbines.

Turbine includes turboprops though, which are a significant minority of airliners and commercial aircraft.

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quietflyr t1_jdvvz8z wrote

The pedantry here is incredible...

Dash-8: 1258 built

ATR-42: 497 built

ATR-72: 1000 built

Beech 1900: 695 built

Saab 340: 459

Those would be all the most popular turboprop airliner types in service today, totalling 3909 aircraft built, ever. And we're talking Part 121 aircraft here, not Part 135. Though adding Part 135 would very likely add to my point.

There have been over 11,000 737s built, over 10,000 A320s, and tens of thousands of other Boeing and Airbus types. Plus 4000 CRJs. Plus 3000 Embraers of various types.

But if you want to pretend my comments aren't valid because I used the word "jet" instead of "turbine" and thus excluded a small proportion of the global airliner fleet, go right ahead.

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paulHarkonen t1_jdvqs74 wrote

"It's in the manual" is just another way to say "it can run on this". How many times did you fuel up with Avgas?

Yes they can run on it (they can run on a lot of stuff) but the practical reality is that they don't.

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