FDIO message field 08 contains which data element?

FDIO message field 08 contains which data element?

• A. Speed
• B. Time
• C. Route
• D. Assigned Altitude

Answer: (D)

Field 08 of the FDIO message contains the assigned altitude—the vertical level ATC has instructed the aircraft to maintain. This altitude constraint is essential for keeping aircraft safely separated in the vertical dimension, and it’s the specific data element designated for conveying the assigned altitude in the FDIO format. Speed, time, and route are represented by other data elements or fields, so field 08 is not used for those items. The pilot and controller use the assigned altitude to plan climbs or descents and to ensure correct vertical separation throughout the flight.

Field 08 of the FDIO message contains the assigned altitude—the vertical level ATC has instructed the aircraft to maintain. This altitude constraint is essential for keeping aircraft safely separated in the vertical dimension, and it’s the specific data element designated for conveying the assigned altitude in the FDIO format.

Speed, time, and route are represented by other data elements or fields, so field 08 is not used for those items. The pilot and controller use the assigned altitude to plan climbs or descents and to ensure correct vertical separation throughout the flight.