Cross Country Planning

Question 1

How far will an aircraft travel in 7.5 minutes with a ground speed of 114 knots?
(use the flight computer - E6B)

Answer 1

14.25 NM

On the front of the dial rotate the inner dial so that the 60 min is pointed at the 114 knots on the outer scale. Next look around the inner scale until you get to 75 (for 7.5 minutes) Look for the distance you will travel directly above on the outer scale and find the pointer indicating 1425 or 14.25 Nautical Miles

Question 2

On a cross country flight, point A is crossed at 1500 hours and the plan is to reach point B at 1530 hours. Use the following info to determine the indicated airspeed required to reach point B on schedule.

Distance between A and B = 70 NM
Forecast Wind = 310 deg at 15 kts
Pressure Altitude = 8,000 ft
Ambient Pressure= -10 deg C
True Course = 270 deg

Answer 2

Use E6B

To travel 70 miles in 30 min requires a ground speed of 140 knots in no wind. Since you have a right quartering headwind, which will slow your ground speed, the indicated airspeed must be more than 140 knots.

Answer 152 knots.

Question 3

How far will an aircraft travel in two and one-half minutes with a ground speed of 98 knots?

Answer 3

4.08 nautical miles

Use the E6B

98 knots is 1.63 nautical miles per minute; multiplied by 2.5 minutes gives the answer of 4.08 miles.

On e6b put 98 on outside
Put 25 on inside
Read number on very inside, which is 4:00 and a little more, which is 4.08

Question 4

If fuel consumption is 15.3 gallons per hour and ground speed is 167 knots, how much fuel is required for an aircraft to travel 620 nautical miles?

Answer 4

620 nautical miles at 167 knots will take 3.71 hours (620 / 167= 3.71), or about 3 hrs 42 min. Multiply that by the fuel burn of 15.3 gph and you get 56.8 gallons.

So answer is 56.8 gallons