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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
For all intents and purposes, the current Iranian leadership has already taken an irreversible decision to acquire nuclear weapons.
"There are times when, in spite of all the effort, one cannot find what one is looking for and, thinking in the well-being of the Ecuador team, I have taken the irreversible decision to resign," said Suarez.
Local primary care trusts have told us this is an irreversible decision, so it's really a case of like it or lump it.
But nuclear campaigner Roger Higman has warned against making an irreversible decision on nuclear disposal.
If in any doubt always consult your local vet before making any irreversible decision.
The message that we are trying to get across to the British people is that this is an irreversible decision. If Britain decides to leave there will not be a going back.
The Leavers must clean up their campaign before Thursday's seismic, irreversible decision.
"We are not demanding a no vote, we are simply asking that councillors slow down the indecent haste which it appears this deal is being forced through and allow each of us time to consult with both the City Council and Wasps before any irreversible decision is taken."
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.
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.