FAA Airline Transport Pilot (ATM)Aircraft Performance and Weight and BalanceEasy
A loadmaster shifts the aircraft's center of gravity further forward than normal for a flight. Which of the following is a direct effect of this forward CG condition?
- AIncreased longitudinal stability and a higher stall speed
- BDecreased longitudinal stability and lower stall speed
- CReduced elevator authority required for rotation
- DIncreased fuel efficiency due to reduced drag
Show answer & explanationAnswer & explanation
Correct answer: A. Increased longitudinal stability and a higher stall speed
A forward CG increases the download required on the tail to maintain trim, increasing longitudinal stability but also increasing the effective wing loading, which raises stall speed and requires greater elevator (up) deflection for rotation.
Why the other options are wrong
- B. Forward CG increases, not decreases, stability, and raises stall speed.
- C. Forward CG requires MORE elevator deflection to rotate, not less.
- D. Forward CG typically increases trim drag, reducing efficiency, not improving it.
Forward CG Effects
A forward center of gravity increases longitudinal stability and stall speed but requires greater elevator deflection and more trim drag.
- Increases stick force stability
- Raises stall speed slightly
- Requires more nose-up elevator for rotation and flare
Memory trick: 'Forward CG = Firm and Fast (stall speed up)'