What could be a consequence of using incorrect ADS data?

• A. Safety margins are preserved during flight.
• B. Unsafe flight conditions due to incorrect ADS data affecting airspeed, altitude, or attitude.
• C. More precise weather readings.
• D. Shorter takeoff distance.

Answer: (B)

The main idea is that the aircraft relies on accurate air data to know its speed, altitude, and attitude, and to feed the automation that controls flight. The air data system provides the primary indications for airspeed, altitude (and Mach), and attitude to the cockpit instruments and to the flight computers. If that data is wrong, the airplane may respond to incorrect information. For example, airspeed could appear too high or too low, leading you to fly outside safe margins and risking a stall or an overspeed. Altitude could be misreported, causing deviations from cleared flight levels or terrain clearance issues. Attitude data that’s in error can result in inappropriate pitch or roll commands from the flight director or autopilot, degrading handling and increasing the chance of excursions outside safe flight envelopes. Because the automation depends on accurate ADS inputs, incorrect data can create unsafe flight conditions rather than preserving safety margins or improving performance. Weather readings aren’t derived from ADS data, so it wouldn’t provide more precise weather information, and it wouldn’t automatically translate into shorter takeoff distances.