What is the backup airspeed for the T-6?

The backup airspeed for the T-6 is indeed 100 knots. This speed is crucial for maintaining safe control of the aircraft in various phases of flight, particularly during approaches and landings when the primary airspeed indicators may fail or under conditions where a backup reference is needed.

At 100 knots, the aircraft is positioned to ensure effective control surface responsiveness and optimal performance. This speed helps prevent stalling and ensures that the pilot can maintain the necessary pitch and descent profiles during critical flight operations. Additionally, having a backup airspeed referenced in training and operational guidelines reinforces the safety protocols that are essential for effective aircraft management.

In contrast, the other choices represent either higher or lower airspeeds that do not align with the operational limits and safety guidelines established for the T-6, making them less suitable as backup airspeed options in a practical scenario.