During night operations, what is the distance between aircraft in flight?

During night operations, what is the distance between aircraft in flight?

• A. 3 to 5 rotor disks
• B. 2 to 3 rotor disks
• C. 1 to 2 rotor disks
• D. 4 to 6 rotor disks

Answer: (A)

In night helicopter formation, distance is measured in rotor disk diameters so pilots can easily gauge spacing regardless of aircraft size. The three to five rotor disks apart provides a solid safety buffer for the reduced visibility, slower depth perception, and higher workload that come with night flying. It also gives enough room to absorb rotor wash and wake effects, and to react without breaking the formation if one aircraft makes a small maneuver. Spacing closer than this narrows the margin for error in darkness, while spacing much farther apart undermines mutual support and timing for the mission. That's why three to five rotor disks is the recommended separation.

In night helicopter formation, distance is measured in rotor disk diameters so pilots can easily gauge spacing regardless of aircraft size. The three to five rotor disks apart provides a solid safety buffer for the reduced visibility, slower depth perception, and higher workload that come with night flying. It also gives enough room to absorb rotor wash and wake effects, and to react without breaking the formation if one aircraft makes a small maneuver. Spacing closer than this narrows the margin for error in darkness, while spacing much farther apart undermines mutual support and timing for the mission. That's why three to five rotor disks is the recommended separation.