ADX ADX Aircraft Performance and Weight Balance 1 — Questions and Answers
Question 1: What is the maximum allowable takeoff weight (MTOW) of an aircraft?
- The maximum certified weight at which an aircraft may begin its takeoff roll (Correct answer)
- The maximum weight at which an aircraft may land
- The maximum weight permitted during cruise flight
- The maximum weight of fuel that can be loaded
Correct answer: The maximum certified weight at which an aircraft may begin its takeoff roll
MTOW is the maximum weight, as certified by the manufacturer and regulator, at which an aircraft is permitted to commence takeoff.
Question 2: What does 'center of gravity' (CG) refer to in aircraft dispatch?
- The single point at which the aircraft's entire weight is considered to act (Correct answer)
- The geographic midpoint of the planned flight route
- The center of the aircraft's fuel tank arrangement
- The midpoint of the passenger cabin seating area
Correct answer: The single point at which the aircraft's entire weight is considered to act
Center of gravity is the balance point of the aircraft's total weight; its position within approved limits is critical for stable, controllable flight.
Question 3: What is zero fuel weight (ZFW)?
- The maximum allowable weight of the aircraft including payload but excluding usable fuel (Correct answer)
- The actual weight of the aircraft after all fuel is consumed
- The weight of the aircraft with completely empty fuel tanks
- The minimum operating weight required for dispatch
Correct answer: The maximum allowable weight of the aircraft including payload but excluding usable fuel
ZFW is the maximum structural weight permitted with no usable fuel, constraining how much payload can be loaded before fuel is added.
Question 4: What is 'useful load' in aircraft weight-and-balance calculations?
- The difference between the aircraft's maximum gross weight and its empty weight (Correct answer)
- The combined weight of revenue passengers only
- The weight of all cargo loaded in the hold
- The total weight of fuel carried on the flight
Correct answer: The difference between the aircraft's maximum gross weight and its empty weight
Useful load is the total capacity available for passengers, baggage, cargo, and fuel, calculated as maximum gross weight minus empty weight.
Question 5: How does high density altitude affect aircraft performance?
- It reduces both engine thrust and aerodynamic lift due to lower air density (Correct answer)
- It increases engine thrust by requiring richer fuel mixtures
- It has no measurable effect on takeoff or climb performance
- It only degrades landing performance, not takeoff
Correct answer: It reduces both engine thrust and aerodynamic lift due to lower air density
At high density altitude, reduced air density lowers engine power output and decreases the lift generated by the wings, degrading overall performance.
Question 6: What does the aircraft 'flight envelope' define for dispatch planning?
- The approved boundaries of weight, balance, speed, and structural loading for safe operation (Correct answer)
- The aircraft's scheduled maintenance inspection intervals
- The physical dimensions of the aircraft's cargo compartment
- The maximum radio communication range of the aircraft
Correct answer: The approved boundaries of weight, balance, speed, and structural loading for safe operation
The flight envelope defines all operating limits — structural, aerodynamic, and performance — within which the aircraft can be safely dispatched and flown.
ADX ADX Aircraft Performance and Weight Balance 1
What is the maximum allowable takeoff weight (MTOW) of an aircraft?