What is the minimum dry runway length and width?

• A. 3500' x 60'
• B. 4000' x 65'
• C. 4000' x 60'
• D. 4500' x 70'

Answer: (B)

Minimum runway dimensions are set to ensure the aircraft can safely operate on a dry surface, taking into account takeoff performance and enough lateral clearance. For the Longitude 700 under standard conditions, the smallest combination that satisfies both the required takeoff distance and safe edge clearance is 4,000 feet in length and 65 feet in width.

That 4,000-foot length provides enough ground roll and acceleration to rotation with appropriate margins for engine-out climb or a potential rejected takeoff. The 65-foot width gives sufficient clearance for the wings and landing gear during takeoff and initial roll, plus room for maneuvering and braking.

The other options either don’t meet the length requirement or the width requirement. A shorter length would compromise takeoff performance and safety margins, while a narrower width at 4,000 feet wouldn’t meet the minimum width needed for safe operation. A longer and wider option is safe but not the minimum.