Is the baseline takeoff CG within a notional envelope of 60 to 78 inches?

Is the baseline takeoff CG within a notional envelope of 60 to 78 inches?

• A. No, outside the envelope.
• B. Yes, 77.6 inches is within 60–78 inches.
• C. Yes, but the CG is above 78 inches.
• D. Yes, but the CG is below 60 inches.

Answer: (B)

The key idea is that the baseline takeoff center of gravity must lie within a defined range to ensure proper longitudinal stability and controllability during takeoff. That range here is 60 to 78 inches. A CG of 77.6 inches is between 60 and 78, so it sits inside the envelope. This is why it’s the correct conclusion. If the CG were 78 inches or more, or 60 inches or less, it would be at or beyond the bounds, which would not meet the requirement.

The key idea is that the baseline takeoff center of gravity must lie within a defined range to ensure proper longitudinal stability and controllability during takeoff. That range here is 60 to 78 inches. A CG of 77.6 inches is between 60 and 78, so it sits inside the envelope. This is why it’s the correct conclusion. If the CG were 78 inches or more, or 60 inches or less, it would be at or beyond the bounds, which would not meet the requirement.