ACS Weight & Balance 5

Question 1

During an aircraft weighing procedure, the tare weight refers to:

Accepted Answer

The weight of chocks, stands, or equipment placed on the scales that must be subtracted

Answer

Tare is the combined weight of any equipment (jacks, chocks, dollies) resting on the scales during weighing, which must be deducted from the scale readings.

Question 2

Which formula correctly expresses the relationship used to find CG from weight and moment data?

Accepted Answer

CG = Total Moment ÷ Total Weight

Answer

CG arm = Total Moment divided by Total Weight, giving the CG location in inches from the datum.

Question 3

An aircraft's weight and balance record shows it was last weighed 8 years ago with no alterations since. What should a mechanic do before the next flight?

Accepted Answer

No action required; the record remains valid if no alterations changed weight or equipment

Answer

FAA regulations do not mandate periodic reweighing; the existing record stays valid provided no alterations affecting weight or CG have been made.

Question 4

What is the moment index, and why is it used?

Accepted Answer

A scaled-down moment value (moment ÷ a reduction factor) to simplify arithmetic

Answer

A moment index divides the moment by a constant (e.g., 1,000) to produce smaller, easier-to-use numbers on loading charts.

Question 5

If two items of equal weight are placed equidistant fore and aft of the current CG, what happens to the CG?

Accepted Answer

CG does not move

Answer

Equal weights placed symmetrically about the CG produce equal and opposite moments that cancel out, leaving the CG unchanged.

(ACS) Airman Certification Standard Certified Mechanic Practice Test

(ACS) Airman Certification Standard Certified Mechanic Practice Test

ACS Weight & Balance 5