The speed brake will remain extended until which constraints are met?

The speed brake is an essential component in aircraft that helps manage speed and descent rate during different phases of flight. It is designed to increase drag and reduce speed, and it will remain extended under certain specific conditions.

The correct answer indicates that the speed brake will remain extended until all specified constraints are satisfied. This includes:

1. The Position of the Power Control Lever (PCL): When the PCL is moved to the MAX position, one of the functionalities is that it reverts the speed brake to a neutral state, allowing the aircraft to gain speed appropriately during high power settings.

2. Flaps Extension: When the flaps are extended, they increase lift at lower speeds, allowing the aircraft to maintain controlled flight without relying solely on the speed brake. The deployment of flaps may work in conjunction with the speed brake, requiring the speed brake to retract or cease functioning for optimal performance.

3. Speed Brake Switch Position: Moving the speed brake switch forward directly manipulates the function of the speed brake. This action is a manual override that can retract the speed brake regardless of other conditions, thus clearing it for optimal flight dynamics.

All these conditions must be checked to ensure the speed brake retracts safely and effectively, facilitating a balance between speed management