Refer to figure.
Using the Range Performance Cruise chart in reverse, what power setting achieves a range with reserve of 580 NM?
Pressure altitude = 8000 ft
Temperature = ISA -7°C
Refer to figure.
Step 1: Determine OAT
ISA temperature at 8000 ft = 15 - (8 x 2) = 15 - 16 = - 1°C (ISA standard).
Temperature is ISA-7°C, so OAT = -1 - 7 = -8°C
Step 2: Enter chart at OAT = -8°C on the left temperature axis
Move vertically to intersect the 8000 ft pressure altitude line form -8°.
At PA 8000 ft and OAT -8°C (cold temperature, moderate altitude), draw an horizontal line to the right.
Step 3: From that intersection, identify which RANGE WITH RESERVE power curve yields 580 NM.
Draw a vertical line at 580 NM with reserve.
The intersection at 580 NM with reserve falls on the 55% power curve.
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