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Definition. The point during a flight at which an aircraft is no longer capable of returning to the airfield from which it took off due to fuel considerations. Beyond this point the aircraft must proceed to some other destination.
The point of no return (PNR or PONR) is the point beyond which one must continue on one's current course of action because turning back is no longer possible, being too dangerous, physically difficult, or prohibitively expensive to be undertaken.
Mar 22, 2022 · The point of no return is defined as the point where the travel time to the destination (C) is equal to the travel time when returning to the departure (A). On each leg, calculating travel times is trivial with the known ground speed and distance ($ \text{time} = \text{distance} / \text{speed}$).
Point of No Return (AKA point of safe return) There are a number of methods which can be used to calculate a PNR/PSR, but the one most favoured uses what are called Specific Fuel Flows (SFF).
May 1, 2021 · This month marks the anniversary. The failure of the Pratt & Whitney PW4000 turbofan engine on this Boeing 777—the fifth one built—appears to have been caused by the fatigue fracture and separation of a compressor blade. The crippled flight returned to Denver and landed safely.
Sep 20, 2011 · “In 2008, I called this a point of no return [also called a commit-to-stop point] on the runway, referring then to the lowest speed that the airplane can slow down to before the crew initiates the go-around.
Oct 7, 2023 · In aviation, there’s a critical concept known as Equal Time Point (ETP), often utilized in Extended Range Twin Engine Operations (ETOPS). ETP is the point along a flight route where it takes the same amount of time to reach both the destination and the departure point in case of a return.
