Practice Test Geeks(ACS) Airman Certification Standard Certified Mechanic Practice Test
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Weight & Balance Flashcards

7 cards from real ACS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Weight & Balance flashcards as text

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

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

    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.

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

    Answer: CG = Total Moment ÷ Total Weight

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

  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?

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

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

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

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

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

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

    Answer: CG does not move

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

  6. When must a mechanic update the aircraft weight and balance records after maintenance?

    Answer: Only when a major alteration or repair changes the aircraft's weight or CG

    FAR 43.9 and related regulations require updating weight and balance data only when a repair or alteration changes the aircraft weight or CG location.

  7. A multiengine aircraft has an inoperative engine on the left side. How does this affect weight and balance considerations?

    Answer: Lateral CG shifts toward the operating engine, which must remain within lateral limits

    If an engine fails or is removed, weight is lost asymmetrically, shifting lateral CG toward the remaining engine side, which must stay within lateral limits.