Which statement about takeoff and fuel configuration is true?

Which statement about takeoff and fuel configuration is true?

• A. Takeoff is prohibited with partial wing fuel and fuel in the fuselage tanks.
• B. Takeoff is permitted with partial wing fuel and fuel in the fuselage tanks.
• C. Takeoff is prohibited only when wing fuel is below a threshold.
• D. Takeoff is allowed only with all tanks full.

Answer: (A)

Fuel distribution during takeoff directly affects the airplane’s center of gravity and its controllability at a critical, high-thrust phase. On the Beechjet 400A, having wing tanks only partially filled while there is fuel in the fuselage tanks can shift the weight to a position where elevator authority or rotation control is degraded and the center of gravity may fall outside the safe takeoff envelope. This combination can also introduce unfavorable fuel-feed or balance characteristics right as you’re applying maximum takeoff thrust. For that reason, this specific mixed configuration is prohibited for takeoff to ensure stable rotation, initial climb, and reliable engine fueling. In other configurations, such as with full wing fuel and empty fuselage tanks or with all tanks managed within approved limits, the CG stays within the approved range and takeoff control remains acceptable.

Fuel distribution during takeoff directly affects the airplane’s center of gravity and its controllability at a critical, high-thrust phase. On the Beechjet 400A, having wing tanks only partially filled while there is fuel in the fuselage tanks can shift the weight to a position where elevator authority or rotation control is degraded and the center of gravity may fall outside the safe takeoff envelope. This combination can also introduce unfavorable fuel-feed or balance characteristics right as you’re applying maximum takeoff thrust. For that reason, this specific mixed configuration is prohibited for takeoff to ensure stable rotation, initial climb, and reliable engine fueling. In other configurations, such as with full wing fuel and empty fuselage tanks or with all tanks managed within approved limits, the CG stays within the approved range and takeoff control remains acceptable.