Final answer:
To close a civilian flight plan at a non-military installation, an Army pilot should contact the nearest Flight Service Station by radio or telephone, or use alternative methods such as ATC services or online platforms if necessary.
Step-by-step explanation:
An Army pilot may close a civilian flight plan (FP) at a non-military installation by following similar procedures as civilian pilots. The process includes contacting the nearest Flight Service Station (FSS) by radio or telephone. The pilot can utilize frequencies such as 122.2 MHz to reach FSS while airborne or use a telephone after landing to provide the necessary information for closing the flight plan. Effective communication is essential for properly concluding a flight plan and avoiding the initiation of search and rescue operations.
It is crucial for the pilot to ensure that the flight plan is closed promptly after landing, as leaving a flight plan open can lead to unnecessary concern and the potential waste of search and rescue resources. If radio contact cannot be established, pilots can also close their flight plan through certain air traffic control (ATC) services or by utilizing an online platform, if available.