Free CPL Flight Performance and Planning Questions and Answers 1 — Questions and Answers
Question 1: A pilot is planning a VFR flight at night. According to regulations, what is the minimum fuel reserve required upon reaching the first point of intended landing?
- Enough fuel to fly for an additional 30 minutes at normal cruising speed.
- Enough fuel to fly to an alternate airport plus 30 minutes.
- Enough fuel to fly for an additional 45 minutes at normal cruising speed. (Correct answer)
- Enough fuel to fly to an alternate airport plus 45 minutes.
Correct answer: Enough fuel to fly for an additional 45 minutes at normal cruising speed.
According to 14 CFR § 91.151, for a VFR flight at night, an aircraft must carry enough fuel to fly to the first point of intended landing and, assuming normal cruising speed, to fly after that for at least 45 minutes. The 30-minute requirement is for VFR flights during the day.
Question 2: A commercial pilot is preparing for a takeoff from a high-elevation airport on a hot day. How will the high density altitude affect the aircraft's takeoff performance?
- It will increase engine power and decrease the takeoff roll.
- It will decrease engine power and decrease the takeoff roll.
- It will have no significant effect on takeoff performance.
- It will decrease engine power and increase the takeoff roll. (Correct answer)
Correct answer: It will decrease engine power and increase the takeoff roll.
High density altitude means the air is less dense. This reduces engine performance because the engine takes in less air, and it diminishes lift because there are fewer air molecules for the wings to act on. Consequently, the aircraft will require a longer ground roll to achieve the necessary lift for takeoff.
Question 3: During flight planning for a multi-engine aircraft, what does the term 'accelerate-stop distance' refer to?
- The total distance required to accelerate to rotation speed and then climb to 50 feet.
- The distance covered from the start of the takeoff roll to the point where the aircraft reaches its best rate of climb speed (Vy).
- The total distance required to accelerate to a specific speed (V1), experience an engine failure, and bring the aircraft to a complete stop on the remaining runway. (Correct answer)
- The distance required to accelerate to V1, continue the takeoff on one engine, and reach a height of 50 feet.
Correct answer: The total distance required to accelerate to a specific speed (V1), experience an engine failure, and bring the aircraft to a complete stop on the remaining runway.
Accelerate-stop distance is a critical performance calculation for multi-engine aircraft. It is the total runway distance required to accelerate to the takeoff decision speed (V1), have the critical engine fail at that instant, and then abort the takeoff and bring the aircraft to a full stop.
Question 4: A pilot is using a takeoff performance chart that requires inputs for pressure altitude, temperature, weight, wind, and runway slope. If the runway has a 2% upslope, how will this affect the takeoff distance required?
- It will decrease the takeoff distance.
- It will have no effect on the takeoff distance.
- It will increase the takeoff distance. (Correct answer)
- Its effect depends solely on the wind component.
Correct answer: It will increase the takeoff distance.
Taking off on a runway with an upslope requires the aircraft's engines to overcome both rolling friction and the force of gravity acting against the direction of motion. This results in slower acceleration and a longer ground roll to reach liftoff speed.
Question 5: Which of the following factors would cause a decrease in an aircraft's climb performance?
- A decrease in gross weight.
- An increase in air density.
- An increase in gross weight. (Correct answer)
- A forward movement of the center of gravity.
Correct answer: An increase in gross weight.
An increase in gross weight significantly decreases climb performance. A heavier aircraft requires more lift to overcome weight, which means it must fly at a higher angle of attack for a given speed. This increased angle of attack results in greater induced drag, leaving less excess power available for climbing.
Question 6: A pilot is calculating density altitude for a flight. The airport elevation is 5,000 feet, the altimeter setting is 29.42 inHg, and the outside air temperature is 30°C. First, the pilot must calculate the pressure altitude. What is the correct pressure altitude?
- 5,500 feet. (Correct answer)
- 4,500 feet.
- 5,000 feet.
- 6,000 feet.
Correct answer: 5,500 feet.
To find pressure altitude, you correct the field elevation for the non-standard pressure. The standard pressure is 29.92 inHg. The difference is 29.92 - 29.42 = 0.50 inHg. The rule of thumb is that pressure changes by about 1 inch per 1,000 feet. Therefore, the correction is 0.50 * 1,000 = 500 feet. Since the actual pressure is lower than standard, the pressure altitude is higher than the field elevation: 5,000 feet + 500 feet = 5,500 feet.
