article_snippet: Scroll down for video .
article_snippet: According to the flight manual there are 'routine' and 'emergency' access requests.
article_snippet: The flight manual states that the control unit is responsible for: .
article_snippet: On the Airbus A320, there are three settings: .
highlights_snippet: Indicating system failures of electrical latches and pressure sensors .
  
highlights_snippet: Activating the access request buzzer and turning on the keypad LEDs .
  