Formations will accomplish an interval takeoff whenever calculated minimum power at 60 KIAS is less than what?

The correct answer is based on the concept of minimum power required for safe interval takeoff during formation flying. When calculating the minimum power needed at a specific airspeed, in this case, 60 KIAS, the key factor is ensuring that the power margin is sufficient for separation and performance during the takeoff phase.

For the T-6 formation checkride, if the calculated minimum power at 60 KIAS is less than 85 KIAS, this indicates that the aircraft can safely take off at reduced power without risking loss of control or performance shortfalls. The 85 KIAS threshold provides an adequate buffer for maintaining a safe separation distance between aircraft during the initial climb and allows for contingencies should the leading aircraft experience any issues.

By setting this specific airspeed as the benchmark, pilots can ensure their formation is operating within a safe and coordinated flight envelope, especially during critical phases of flight like takeoff. The decision to use this particular value emphasizes the importance of maintaining safe operational practices while allowing for appropriate power management to achieve an effective interval takeoff.