Increases the need for greater back elevator pressure. This condition is associated with which CG location?

Increases the need for greater back elevator pressure. This condition is associated with which CG location?

• A. Fwd CG location
• B. Aft CG location
• C. Neutral CG location
• D. Mid-range CG location

Answer: (A)

When the center of gravity is forward, the airplane has a stronger nose-down tendency and greater longitudinal stability. To keep the nose level or to raise it, the tail must produce a larger nose-up moment, which is accomplished by deflecting the elevator to increase tail-down force. That means more back elevator input (pressure on the back elevator) is required. So, forward CG location is associated with a need for greater back elevator pressure. If the CG were aft, you’d need less back elevator input to hold attitude, though stability and stall characteristics would differ.

When the center of gravity is forward, the airplane has a stronger nose-down tendency and greater longitudinal stability. To keep the nose level or to raise it, the tail must produce a larger nose-up moment, which is accomplished by deflecting the elevator to increase tail-down force. That means more back elevator input (pressure on the back elevator) is required. So, forward CG location is associated with a need for greater back elevator pressure. If the CG were aft, you’d need less back elevator input to hold attitude, though stability and stall characteristics would differ.