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True. PAO has little to none cleaning capabilities.

Here is a discussion on base oils; see specifically, Solvent Refining : https://bobistheoilguy.com/synthetic-base-oils-discussion-one-perspective/

Understanding of a subject comes from reading and understanding what is read. BITOG's primary reason for its existence is to help educate on the topics of lubricants and tribology. Is there a specific lubricant or tribology question you would like to discuss?

The first item in Post 13 is most likely a Group II base oil. The second item in Post 13 is a Group IV PAO base oil. The third item in Post 13 is most likely a Group I carrier oil for the additive package. The fourth item in Post 13 is the primary anti-oxidant. Not shown is the VII, the...

@Cujet Can we assume that in your wing fixture pic that that both wings have been joined?

Ribs determine the shape of the wing, the airfoil shape or profile, and determine its lift/drag ratio. Stringers also help to carry the bending, shear, and twisting loads spanwise. If thin wing panels (skins) are used, multiple spars have to be present to react to the bending, shear, and...

Ribs: What are the purpose and function of the wing's ribs?

"...The primary objective of the wing’s internal structure is to withstand the shear and bending moments acting on the wing at the Ultimate load factor. The secondary objective is to make the wing as light as possible without compromising the structural integrity of the design as described...

From concept to prototype to practical is a long road. Then there are the initial and lifetime costs to consider, aka, ROI.

Great answers, folks. The primary purpose of a wing, of course, is to provide lift for the rest of the structure. Wing box construction usually consists of a main (or front) spar and a rear spar, stringers, ribs and wing skins. What are the functions of wing spars? For reference...

Before we discuss wing box construction we know wings can be attached to the bottom fuselage, mid-fuselage, and at the top of the fuselage. Wings also can possess "hedrals." Name an aircraft that has an Anhedral wing and name an aircraft that has a Dihedral wing. For reference...

Simple Flying: Why Boeing Can't Stretch the 737 Max any Longer Simply Flying online magazine has a number of articles, including the article above, that are easy to read and contain a lot of historical and background information.

AI generated data is not allowed.

"FAA Sec. 23.785 — Seats, berths, litters, safety belts, and shoulder harnesses. There must be a seat or berth for each occupant that meets the following: (a) Each seat/restraint system and the supporting structure must be designed to support occupants weighing at least 215 pounds when...

How about a specially compounded 6W46? 😁

Good answers, guys. I would only add the obvious answer is that seat tracks allow variable seat pitch.

Floor panels support seat tracks on commercial aircraft which support passenger seats. Question 1: Why have seat tracks? Question 2: How much G force is a seatrack designed to withstand?

No it is true. Here is how you analyze stresses around aircraft windows: https://www.egr.msu.edu/classes/me424/averillr/Marc.FuselageWindow.pdf

Or, the empennage/fuselage "carry-through" connecting structure failed. A designer has to concern himself with carry-through loads. At Boeing, we had designers that had courses in Stress and Fatigue, but we also had a separate group that did the final Stress and Fatigue Analysis for good...

A resource on empennage design: https://www.fzt.haw-hamburg.de/pers/Scholz/HOOU/AircraftDesign_9_EmpennageGeneralDesign.pdf