Who Likes Aircraft ?

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[Basket case]

 

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The P-61 was equipped with 4 × 20 mm (.79 in) Hispano AN/M2 cannons installed in its wings and 4 × .50 in (12.7 mm) M2 Browning Machine Guns positioned in a remotely operated turret. This turret was controlled by a gyroscopic fire control computer worked by either the gunner or radar operator

 

[Photon440]

Looks like with so few flights these day, all those non-flying 737s are going to need a check up. (This doesn't refer to the grounded 737Max 8). Planes that aren't flown at least once a week need an inspection, and that could mean 2,000 planes.
https://simpleflying.com/faa-emergency-directive-737/?utm_source=pop

 

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[Slap Stick]

Looks like with so few flights these day, all those non-flying 737s are going to need a check up. (This doesn't refer to the grounded 737Max 8). Planes that aren't flown at least once a week need an inspection, and that could mean 2,000 planes.
https://simpleflying.com/faa-emergency-directive-737/?utm_source=pop

Why only 737s? Boeing didn't make the engines.

 

[Photon440]

Who knows. Maybe it's the odd shaped flat bottom nacelles that the 737 uses...perhaps the valve is in a different location on other planes?

 

[Slap Stick]

I don't think the shape of the nacelle would cause corrosion in the valves.
The shape of the intakes is due to the engine being too large for the plane.
They made it worse on the MAX series.

 

[Photon440]

Not necessarily the shape itself, but the shape is there because certain auxiliary components were tucked up to the side instead of being below, to increase ground clearance.

 

[Duckmanreno]

View attachment 979856

That is a very interesting picture with so many different aircraft in a small area.

 

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[Photon440]

That many jets together, probably JV 44 squadron, formed near the end of the war. There's a good chance they're on the ground waiting for fuel to arrive...

 

[Slap Stick]

Not necessarily the shape itself, but the shape is there because certain auxiliary components were tucked up to the side instead of being below, to increase ground clearance.

And why did they need to increase ground clearance? They already cantilevered the engines forward and up and with normal nacelle the engines still picked up stuff from the ground. The 737s legs are too short for the engines. Or vice versa. Changing the nacelle also required reducing the fan size.
It seems the engines used on the 737 have had some fuel valve problems over the years along with engines ingesting hail causing flameouts. CFM has made mods to prevent this.
That said, the comments regarding component relocation seems to have merit.
While other planes like the Airbus A320 and 340 families and KC-135s (Boeing) use the CFM family of engines, the ones used on 737s are used only on 737s.
And its all due to Boeing's insistence on making the 737 something it isn't.

 

[Photon440]

737s, from the -300 series on up have used CFM engines. Yes, there are modifications for the 737 compared to Airbus 320/321 series, but that isn't unusual. Most of the CFM engines are built as A series (airbus) and B series (Boeing). The engine cores are still pretty much the same. However, not seeing an FAA directive for Airbus that matches the 737 requirement for inspecting air check valves, I guess we can indeed conclude that the reason is something Boeing designed.

Personally, I'm a little surprised that merely sitting for over 7 days would cause an aircraft quality valve to seize up. Don't they put engine covers on parked aircraft any more?