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@Cujet "A gas turbine engine runs or self sustains, when we combust fuel, because? It is a very, very simple question, with an incredibly simple answer. But I've seen many engineers misunderstand the basics." Yes! Now the question I posed is an interesting one, because we need not combust fuel...

The Aeroshell 15W50 and the Phillips avoil have a special detergent/dispersant package that lifts and suspends the lead salts from combustion of aviation gasoline. PAO has no polar affinity for cleaning.

This topic was discussed and answered previously: https://bobistheoilguy.com/forums/search/4228688/?q=Mobil+AV-1&t=post&o=relevance https://bobistheoilguy.com/forums/threads/what-oil-clings-best-to-an-infrequently-run-engine.388750/page-5#post-7219829...

Here is what I believe to have been a potential flow control valve failure in the ECS of a Lear Jet: https://en.wikipedia.org/wiki/1999_South_Dakota_Learjet_crash

Here is an explanation of the fuel control switches excerpted from aeropeep: "Can the Control Switch Be Moved Accidentally? From a design and operational safety perspective, accidental movement of the fuel control switch is highly unlikely, due to several factors: Physical Design: The switch...

Good grief man just scroll down to: https://thepointsguy.com/airline/powering-the-dreamliner-how-the-787s-genx-engines-work/ "Creating Thrust The GEnx is a massive bit of kit. The front rotating fan measures 9.2 ft across. The whole engine weighs 13,200 lb and can produce 76,100 pounds of...

Which engine? https://www.bing.com/search?q=cost+of+787+engines&cvid=aada1d9edfa04288b6dc3f4a78379638&gs_lcrp=EgRlZGdlKgYIABBFGDkyBggAEEUYOTIGCAEQABhAMgYIAhAAGEAyBggDEAAYQDIGCAQQABhAMgYIBRAAGEAyBggGEAAYQDIGCAcQABhAMgYICBAAGEDSAQkxNjQ0MWowajmoAgiwAgE&FORM=ANAB01&PC=U531

Are you referring to an alternate channel within the FADEC?

A pretty good intro. Any object with a volume has to have closed ends in order for pressure to be contained within it. In order for aircraft to be pressurized for passenger comfort and to be able to fly above 10,000 feet, the fuselage has to have two closed ends, which are the aft pressure...

Fuselage Question: Explain the function of the pressure bulkheads in a commercial transport aircraft.

Good catch on the typo folks. (y) This should have read: "In the Boeing 747 main fuselage of 11 feet in radius, for example, the Frames are 6.3 inches wide, are spaced every 20 inches, 0.071 inches thick, with the stringers spaced about 8 inches apart." The data given by Niu* says the radius...

You got it. Fairings provide a transition to reduce drag where various structures meet and where one or more structures may have an abrupt leading or training edge. For example, you will see a fairing where the wing root meets the fuselage. Fairings can be made of composites or fiberglass.

It was suggested in the investigation but apparently not considered as a root cause of those in-flight upsets. Anything can be a possibility. I never saw that comment but was the cause a programming or IC (component) fault?

@y_p_w Undoubtedly you have never done Fault Tree Analysis. This is done for both software and hardware in a drill-down fashion, from the system level all the way down to the PCB and component level. "Fault tree analysis (FTA) is a type of failure analysis in which an undesired state of a...

I must admit I don't understand your question. How can you have a turboshaft engine with useful thrust without some thermodynamic cycle providing power? How are you defining self-sustaining?

The jet engine utilizes the Brayton thermodynamic cycle. It works with either a centrifugal compressor and turbine or an axial compressor and turbine. Turboprop jet engines, such as the P&W PT6 and later series, use both types: an axial compressor stage and then a centrifugal compressor with an...

Well, yes it is. It is a no-faith statement of the technology.

" Still, the same report flagged a bright red public perception problem. A 2017 global survey found that a majority of people would be unwilling to fly in a plane without a pilot, even if the airfare were cheaper."

No anger here, just facts devoid of paranoia and other off topic artifacts.

Considering the fact that 2000 flight parameters are recorded on a 787, I would say yes. The data travels on a fast Full Duplex Fiber Optic system, via the ARINC 767 characteristics. https://skybrary.aero/sites/default/files/bookshelf/2955.pdf