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Given:

Distance from departure to destination: 500 NM
Safe Endurance: 4 h
TAS: 140 kt
Ground Speed Out: 150 kt
Ground Speed Home: 130 kt

What is the distance and time of the PSR from the departure point?

  • A
    Distance: 221 NM Time: 89 min
  • B
    Distance: 232 NM Time: 107 min
  • C
    Distance: 279 NM Time: 111 min
  • D
    Distance: 139 NM Time: 60 min

Time to PSR (Point of Safe Return):

The Point of Safe Return (PSR) is the last point on a route at which it is possible to return to the departure airfield arriving back with the required fuel reserves still available in the tanks. Continuing passed the PSR you are now committed to landing at your destination.

Time (to PSR) = E x H / (O + H)

E = Safe Endurance based on available fuel
H = Ground speed Home
O = Ground speed Out

PSR = 4 x 130 / (150 + 130) = 1.85 hr = 1 hr 51 minutes = 111 minutes
Distance = time x GS out = 1.85 x 150 = 278 NM

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