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Aircraft Weight & Balance Flashcards

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

Read the first 7 Aircraft Weight & Balance flashcards as text

  1. When is an aircraft required to be re-weighed per FAA regulations?

    Answer: After major repairs or alterations that may have altered the aircraft's weight and balance

    FAA regulations require re-weighing after major repairs or alterations that could affect the aircraft's weight and balance data, to ensure records remain accurate.

  2. What is the primary purpose of installing ballast on an aircraft?

    Answer: To shift the CG to within the approved limits

    Ballast is added weight installed in a specific location to shift the CG into the approved range when the aircraft would otherwise be out of limits.

  3. What is the function of the aircraft weight and balance record?

    Answer: To document all alterations and repairs that affect weight and balance, reflecting the current configuration

    The weight and balance record provides a running history of all repairs, alterations, and equipment changes so that the aircraft's current empty weight and CG are always known.

  4. How does a moment index differ from a standard moment?

    Answer: Moment index is the moment divided by a reduction factor (e.g., 100 or 1,000) to simplify calculations

    Moment index is a moment divided by an arbitrary reduction factor (commonly 100 or 1,000) to reduce the magnitude of numbers and make manual weight and balance computations more manageable.

  5. What does the abbreviation MAC represent in aircraft weight and balance?

    Answer: Mean Aerodynamic Chord

    MAC (Mean Aerodynamic Chord) is the chord of an imaginary airfoil that represents the aerodynamic properties of the entire wing, commonly used on large aircraft to express CG as a percentage.

  6. If an aircraft's CG is at 25% MAC, the LEMAC is at station 150, and the MAC is 80 inches long, what is the CG station?

    Answer: Station 170

    CG Station = LEMAC + (% MAC × MAC length) = 150 + (0.25 × 80) = 150 + 20 = station 170.

  7. What is the FAA standard weight used for aviation gasoline (avgas) in weight and balance calculations?

    Answer: 6.0 lbs per gallon

    Aviation gasoline (100LL avgas) is standardized at 6.0 lbs per gallon for weight and balance calculations per FAA guidance.