Originally Posted by
FlyingEgghead
It appears to be from
here, which acknowledges that FAA site. It should be noted for clarity that the "rated time" referenced in the image is the
non-ETOPS-rated time.
Originally Posted by
JDiver
Incorrect source listing; the source is Wikimedia; it is open source.
As FlyingEgghead indicated, the "owner" Vladsinger on wikimedia "adapted" by replacing "60 minutes" with "rated time." Everything else is the same down to the angles of the blue dotted line (flight path).
However the problem, as FlyingEgghead also pointed out, is that the diagram is actually mislabeled. If R is the "Distance traveled in rated time with one engine operative" in the context of the ETOPS wiki article, that would make R the ETOPS rated distance. This would then make the blue dotted the line ETOPS "legal" flight path as aircraft has to stay within flying distance of those diversion points. That would make the green line an illegal flight path.
Imagine if one of the questions on the ATP license exam is to draw a diagram explaining ETOPS and that is Vladsinger's answer. Would you want Vladsinger to be your pilot on a oceanic flight? Vladsinger's flight announcement would be "Ladies and Gentlemen, while the flight computer is suggesting a flight time of 15 hours from LAX to SYD, I know a shortcut that will get us there in 12."
