FAA Aircraft Dispatcher Practice Exam

What is the service volume of a high VOR?

1. Up to 12,000 feet AGL at 25 NM

2. From 1,000 feet to 14,500 feet AGL at 40 NM

3. From 18,000 feet AGL to 45,000 feet AGL at 130 NM

4. From 14,500 feet AGL to 18,000 feet AGL at 100 NM

The correct answer is: From 1,000 feet to 14,500 feet AGL at 40 NM

The service volume of a high VOR (VHF Omnidirectional Range) is defined as the range within which the station can provide navigation service. High VORs are designed to cover a larger altitude range and further distance compared to lower VORs. The correct choice indicates that the service volume extends from 1,000 feet to 14,500 feet AGL (Above Ground Level) and covers a distance of 40 nautical miles. This specification aligns with the typical operational parameters for high VORs, which are set to aid aircraft flying at medium altitudes, particularly in the airspace typically occupied by commercial flights and some general aviation. To provide context, lower VORs, in contrast, operate at lower altitudes— which helps support operations closer to the ground and usually with a shorter service range. Other ranges such as those extending beyond 14,500 feet often pertain to high altitude VORs, but 130 NM service volumes are more characteristic of a VORTAC, while the altitude range of 14,500 to 18,000 feet would not encompass the typical design of a high VOR. Therefore, the service volume defined in the correct choice accurately reflects typical operational ranges and altitudes for high