On a cross-country flight, point X is crossed at 1015 local. What is your expected arrival time at point Y? Use the following information to determine your ETA. Distance between X and Y: 32 NM Forecast wind: 240° at 25 kts Pressure altitude: 5,500 ft Ambient temperature: +05 °C True course: 100° The indicated airspeed is 110 knots.
A
1040 local.
B
1059 local.
C
1029 local.✓ Correct Answer
Explanation
At 5,500 feet pressure altitude and +5 degrees C (about 1 degree warmer than standard), 110 knots indicated is roughly 122 knots true. The wind from 240 at 25 knots is 140 degrees off the course of 100, giving about a 19-knot tailwind and a 16-knot crosswind, so groundspeed is about 140 knots. 32 NM at 140 knots takes about 14 minutes, so crossing X at 1015 gives an ETA of about 1029.
Related navigation questions
If fuel consumption is 15.3 gallons per hour and groundspeed is 167 knots, how much fuel is required...How far will an aircraft travel in 3-1/2 minutes if its groundspeed is 65 knots?If an aircraft is consuming 91 pounds of fuel per hour and groundspeed is 168 knots, how much fuel i...The angular difference between true north and magnetic north isIf a true heading of 135° results in a ground track of 130° and a true airspeed of 135 knots results...
Keep practising
Study more FAA Flight Instructor questions, or take a timed practice quiz.