PPL PPL Weight and Balance

Question 1

What is the standard weight of aviation fuel (100LL) per US gallon used in weight and balance calculations?

Accepted Answer

6.0 pounds

Answer

Aviation gasoline (100LL) weighs 6.0 pounds per gallon at standard temperature, which is the value used in standard weight and balance calculations.

Question 2

In weight and balance, what is the 'datum'?

Accepted Answer

An imaginary vertical reference plane from which all arm measurements are taken

Answer

The datum is an imaginary vertical plane selected by the manufacturer from which all horizontal distances (arms) are measured for weight and balance purposes.

Question 3

What is a 'moment' in weight and balance calculations?

Accepted Answer

The weight of an object multiplied by its arm (distance from datum)

Answer

A moment is the product of a weight and its arm (distance from the datum), expressed in pound-inches, and represents the turning force that weight exerts about the datum.

Question 4

What effect does an aft (rearward) center of gravity beyond limits have on longitudinal stability?

Accepted Answer

Decreases longitudinal stability and can make recovery from a stall difficult or impossible

Answer

An aft CG beyond the approved limit reduces longitudinal stability, making the aircraft pitch-sensitive and potentially unrecoverable from a stall or spin.

Question 5

'Useful load' is defined as the difference between which two weights?

Accepted Answer

Maximum gross weight and basic empty weight

Answer

Useful load equals maximum gross weight minus basic empty weight, representing the total weight available for fuel, oil (if not included in empty weight), passengers, baggage, and cargo.

(PPL) Private Pilot Licence Practice Test

(PPL) Private Pilot Licence Practice Test

PPL PPL Weight and Balance