Pressing the ALT button on the FCP will:

Pressing the ALT button on the FCP will:

• A. Provide instantaneous capture of the pressure altitude existing in the FCC at the time of engagement
• B. Set the altitude to a preset value
• C. Engage altitude hold immediately
• D. Disable the flight guidance system

Answer: (A)

Pressing the ALT button activates altitude capture. It instantly stores the current pressure altitude as read by the FCC, so when you later engage altitude hold the system can use that captured value as the target. It isn’t setting a preset altitude, nor does it by itself engage altitude hold or disable the flight guidance system. This capture helps you quickly reference and hold the aircraft at the exact altitude you were at when you pressed the button.

Pressing the ALT button activates altitude capture. It instantly stores the current pressure altitude as read by the FCC, so when you later engage altitude hold the system can use that captured value as the target. It isn’t setting a preset altitude, nor does it by itself engage altitude hold or disable the flight guidance system. This capture helps you quickly reference and hold the aircraft at the exact altitude you were at when you pressed the button.