Final answer:
When making initial contact with ATC on a direct flight to a NAVAID, the radio call consists of the aircraft's call sign, the NAVAID, altitude, and current position. In a radar environment, radar services are requested in addition to the other information.
Step-by-step explanation:
When making initial contact with ATC on a direct flight to a NAVAID in a non-radar environment, the radio call should consist of the following information:
- The aircraft's call sign
- The NAVAID to which the aircraft is flying
- The aircraft's altitude
- The aircraft's current position or fix
In a radar environment, the radio call would include the same information as above, but with the addition of requesting radar services from ATC.