What is the result when the PM selects the Speed button after the PF calls for speed mode during climb?

When the Pilot Flying (PF) calls for speed mode during a climb and the Pilot Monitoring (PM) selects the Speed button, the system transitions into a different operational state. The correct outcome is that the Vertical Mode changes to CLB (Climb), indicating that the aircraft will now climb at a specified speed rather than at a designated vertical speed.

Simultaneously, the current airspeed is referenced and displayed on the Flight Mode Annunciator (FMA), providing a clear indication of the speed the aircraft will maintain during the climb. This mode allows the flight management system to manage the aircraft's vertical profile while ensuring that the selected airspeed is adhered to, enhancing safety and efficiency during the climb.

This operational feature is integral to the functionality of modern aircraft, allowing for better control during ascent by focusing on airspeed rather than altitude alone. It helps to manage performance, especially when dealing with varying weights and atmospheric conditions during climb.