point of no return

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point of no return

[′pȯint əv ¦nō ri′tərn]
(navigation)
A point along an aircraft track beyond which the aircraft's fuel supply will not permit it to return to its own or some other associated base but must continue in attempt to reach its destination.

point of no return (PNR)

point of no return (PNR)click for a larger image
The farthest point along a track to which an aircraft can fly and still return to the base with adequate fuel reserves. PNR invariably lies beyond the critical point unless the minimum reserve of fuel is carried. While there are many formulas for calculating PNR, the illustration indicates one in the simplest case, when an aircraft is flying from A to B in a straight line. See also critical point.
References in periodicals archive ?
If we leave the UK it is an irreversible decision which will, as Baroness Smith, writes, dictate the future of our children, our children's children and their children to come.
He added: "It is an irreversible decision that a person could live to regret.
But why go through with an irreversible decision without trying?
Richard said if you buy an annuity with your pension you make a one-off irreversible decision, depending on what you choose, and it's possible that after you die the fund and the income are gone.
Today the Undersecretary of the Ministry of Foreign Affairs, Mutrif Siddig, said in a statement to the official Sudan News Agency (SUNA) tha "the decision of the authorities expelling foreign organizations whose violations to the laws of the humanitarian work and their involvement in cooperation with the so-called International Criminal Court have been proved by evidences is an irreversible decision.
The Government has already been taking small steps towards licensing GM, but the cumulative effect will be a momentous and irreversible decision.
Mr George said: "Given public, political and environmental concerns about GM, it would be the height of irresponsibility for the Government not to give MPs the opportunity to debate what could be a momentous and irreversible decision.
NEW YORK -- Believes Shareholders Should Not Be Asked to Make Irreversible Decision before Special Committee's Investigation into Fairness of Sale Process Is Completed
The idea that a handful of governors or an individual headteacher can make such a serious and irreversible decision (to change to an academy) without having consulted fully with staff, parents and the local community will shock all rightminded people.
I fully accept police are forced to face armed and ruthless criminals, but I suggest, like capital punishment, no civilised society should consider allowing the irreversible decision to take a life.
Tim Watts, chairman of Meriden-based Pertemps and Business for Sterling campaigner, said: "Many people don't realise that the euro is an irreversible decision.