Refer to figure.
Using the glide range chart provided, an aircraft cruising at a pressure altitude of 11 500 ft initiates a glide toward terrain at an elevation of 440 ft with QNH of 1011 hPa. What is the glide distance covered?
Refer to figure.
The glide is conducted from the start pressure altitude down to the terrain level. To use the chart correctly, the effective pressure altitude from which the glide begins must be determined relative to the terrain.
Step 1: Convert terrain elevation to pressure altitude
Terrain elevation = 440 ft, QNH = 1011 hPa.
Deviation from standard = 1013 - 1011 = 2 hPa.
Terrain pressure altitude = 440 + (2 x 27) = 440 + 54 = 494 ft.
Step 2: Plot on the chart
Plot 2 pressure altitudes lines at 11 500 ft and 494 ft.
From those two horizontal lines and their interception with the glide oblique line, draw two vertical lines.
Step 3: Read glide range from chart
Substract the value given by the two vertical lines on the horizontal axis:
Glide range = 23.5 - 1.5 = 22 NM (closest answer 22.5 NM)
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