5C - Performance and Limitations - Aircraft Performance Charts

Question 0

2. Time, Fuel, and Distance-to-Climb Chart
   a. Given the following conditions:
   Climb = 2,000 feet to 7,000 feet pressure altitude
   Temperature = Standard
   Airspeed = Best Rate-of-Climb
   Wind speed = Calm
   How much time is required for the climb?
   How much fuel is required for the climb?
   What distance will be covered during the climb?

Answer 0

2

Question 1

1. Takeoff and Landing Distance Charts
   a. Given the following conditions:
   Pressure Altitude = 4,000 feet
   Temperature = 40°F
   Runway = Hard Surfaced
   Weight = Maximum Takeoff Weight
   Wind = 10 Knot Headwind
   What is the distance for a normal takeoff ground roll?
   What is the distance to clear a 50-foot obstacle?
   b. Given the following conditions:
   Pressure altitude = 2,000 feet
   Temperature = 25°C
   Runway = Hard surfaced
   Weight = Maximum Landing Weight
   Wind = Calm
   What is the normal landing distance?
   What is the minimum landing distance over a 50-foot obstacle?

Answer 1

1.

Question 2

3. Maximum Rate-of-Climb Chart
   a. Given the following conditions:
   Pressure Altitude = 4,000 feet
   Outside Air Temperature = 0°C
   What is the best rate-of-climb airspeed?
   What is the best rate-of-climb, in feet per minute?

Answer 2

3

Question 3

4. Cruise Performance Chart
   a. Given the following conditions:
   Pressure Altitude = 6,000 feet
   Engine rpm = 2,400
   MAP = 22 inches
   Temperature = Standard
   What will the true airspeed be?
   What will the fuel consumption rate be?
   What will the percent brake horsepower be?
   b. Given the following conditions:
   Density Altitude at cruising altitude = 4,000 feet
   Temperature = Standard
   What percentage of brake horsepower will be required to produce the maximum true airspeed?
   What will the required power setting be?

Answer 3

4

Question 4

5. Maximum Range/Endurance Chart
   a. Given the following conditions:
   Density Altitude = 8,000 feet
   Temperature = Standard
   Weight = Maximum Gross
   Wind = Calm
   Power = 75%
   BHP Fuel = Full Tanks (Standard) 45 minute reserve
   What true airspeed can be expected?
   What maximum range will be achieved?
   b. Using the data from the previous question, how long can the aircraft fly in hours?

Answer 4

5

Question 5

6. Miscellaneous
   a. Determine the approximate CAS you should use to obtain 180 knots TAS with a pressure altitude of 8,000 feet and a temperature of +4°C.
   158 knots.
   b. At speeds below 200 knots (where compressibility is not a factor), how is true airspeed computed?
   True airspeed can be found by correcting calibrated airspeed for pressure altitude and temperature.
   c. Compute the density altitude for the following conditions:
   Temperature = 20°C
   Field Elevation = 4,000 feet
   Altimeter setting = 29.98
   d. Compute the standard temperature at 9,000 feet.
   The standard temperature at sea level is 15°C. The average lapse rate is 2° per 1,000 feet.
   Compute standard temperature by multiplying the altitude by 2 and then subtracting that number from 15. Based on this information,
   15° – (2° x 9 = 18°) = -3°C
   The standard temperature at 9,000 feet is -3°C.
   e. A descent is planned from 8,500 feet MSL when 20 NM from your destination airport. If ground speed is 150 knots and you desire to be at 4,500 feet MSL when over the airport, what should the rate of descent be?
   • Change in altitude = 4,000 feet
   • Calculate time to go 20 NM at 150 knots (8 minutes)
   • 4,000 feet ÷ 8 minutes = 500 FPM
   f. A descent is planned from 11,500 feet MSL to arrive at 7,000 feet MSL, 5 SM from a VORTAC. With a ground speed of 160 mph and a rate of descent of 600 FPM, at what distance from the VORTAC should the descent be started?
   • Change in altitude = 4,500 feet
   • Rate of Descent = 600 FPM
   • Time to descend = 4,500 ÷ 600 = 7.5 minutes
   • Ground speed in miles per minute = 160 ÷ 60 = 2.67 MPM
   • 7.5 x 2.67 = 20 miles + 5 miles = 25 miles out
   g. If fuel consumption is 15.3 GPH and ground speed is 167 knots, how much fuel is required for an aircraft to travel 620 NM?
   • 620 nautical miles ÷ 167 knots = 221 minutes or 3 hours and 41 minutes
   • 15.3 GPH x 3 hrs. 41 min. = 57 gallons of fuel used
   h. If the ground speed is 215 knots, how far will the aircraft travel in 3 minutes?
   • 215 knots ÷ 60 = 3.58 nautical miles per minute
   • 3.58 NMPM x 3 minutes = 10.75 nautical miles
   i. How accurate should you consider the predictions of performance charts to be?
   Flight tests from which performance data was obtained were flown with a new, clean airplane, correctly rigged and loaded, and with an engine capable of delivering its full rated power. You can expect to do as well only if your airplane, too, is kept in peak condition.

Answer 5

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