Pounds per nautical mile method

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T-39 FLIGHT PREPARATION
STUDENT GUIDE
60
2 gauges
= 1800
30
1 gauge
= 900
45
1 gauge + 1/2 other gauge
= 1350
20
2/3 of 1 gauge
= 600
15
1/2 of 1 gauge
= 450
10
1/3 of 1 gauge
= 300
5
1/2 of 1 gauge divided by 3
= 150
1
1800/60
= 30.0
Wings Level: 106 min
= 60 + 45 + 1 = both gauges + 1 gauge + 1/2 of 1 gauge + 1
= 1800 + 900 + 450 + 30
6040 # - 3180 # = 2860# at the IAF
(4)
Pounds per nautical mile method
Determine fuel flow in terms of pounds per NM by dividing fuel flow (#/hr) by
estimated ground speed to IAF (NM/hr). Multiply the result by the distance remaining to
IAF.
1800 #/hr ÷ 420 NM/hr (estimated) = 4.3 #/NM
Wings level: 742 nm x
6040 ­ 3180 = 2860 # at IAF
COMPARISONS:
Method
Pounds Per Minute
(1). Once fuel flow/min is
(1). Requires accurate ETEs;
determined, multiply by time
preflight winds must be
remaining.
reasonably accurate (+ 10-20
kts and 10-20  o)
(2). In-flight re-planning
(2). Must recompute when
fuel flow changes
(3). Math intensive
Matrix