Category Archives: Mass and Balance

Mass and Balance

The datum used for balance calculations is:

A: chosen on the longitudinal axis of the aeroplane, but not necessarily between the nose and the tail of the aircraft
B: chosen on the longitudinal axis of the aeroplane, and necessarily situated between the nose and the tail of the aircraft
C: chosen on the longitudinal axis of the aircraft and necessarily situated between the leading edge and trailing edge of the wing
D: chosen on the longitudinal axis of the aircraft, and always at the fire-wall level

 

 

 

 

 

 

 

 

Answer: A

A revenue flight is to be made by a jet transport. The following are the aeroplane’s structural limits:; -Maximum Ramp Mass: 69 900 kg, -Maximum Take Off Mass: 69 300 kg, Maximum Landing Mass: 58 900 kg, Maximum Zero Fuel Mass: 52 740 kg. Take Off and Landing mass are not performance limited.; Dry Operating Mass: 34 930 kg; Trip Fuel: 11 500 kg; Taxi Fuel: 250 kg; Contingency %26 final reserve fuel: 1 450 kg; Alternate Fuel: 1 350 kg ; The maximum traffic load that can be carried is:

A: 21 170 kg
B: 17 810 kg
C: 21 070 kg
D: 20 420 kg

 

 

 

 

 

 

 

 

Answer: B

A load placed aft of the datum:

A: Has a positive arm and therefore generates a positive moment
B: Has a negative arm and therefore generates a negative moment and mass
C: Has a negative arm and therefore generates a negative moment but a positive mass
D: Has a positive arm and therefore generates a positive moment but negative mass

 

 

 

 

 

 

 

 

Answer: A

Which of the following is most likely to affect the range of centre of gravity positions on an aeroplane?

A: Elevator and tailplane (horizontal stabiliser) effectiveness in all flight conditions.
B: Location of the undercarriage.
C: The need to maintain a low value of stalling speed.
D: The need to minimise drag forces and so improve efficiency.

 

 

 

 

 

 

 

 

Answer: A