“They are not “shear pin” in the way most people understand the term”
Personally I have no clue. I’ll have to lean on the guy who used to build the plane, deliver the plane, work on Air Force One, and fly them.
He worked for Boeing, on the production line. . .what part of the line and what components?
“deliver the plane,”
He actually delivered the jet? Meaning he handed the jet over to the customer? A production-line guy did that?
“work on Air Force One,”
He was enlisted in the Air Force, with the 89th out of Andrews? When? We probably know a lot of the same people then. Seriously.
“and fly them”
He flew jets like the 777? If he flew at Boeing he was a former military test pilot when he was hired and took new, upgraded or modified jets up.
Let me understand: He was a crew chief on AF1, he also worked the production-line in Kent, WA, and was a Boeing Program Manager that signed over the jet to the customer, and he flew jets like the 777.
Point is, there are many aspect of aviation, from engineering design, production, flight test, delivery, etc., that are part of this world. Few are aware of all aspects.