What does 'OCC' indicate in runway beacon characteristics?

The correct interpretation of 'OCC' in runway beacon characteristics is related to the type of signal the beacon emits. 'Occulting' indicates that the light signal is periodically interrupted, creating a specific pattern of light and darkness. This pattern is crucial for pilots as it allows them to distinguish the beacon from other lights, especially in conditions where visibility might be reduced.

The use of an occulting signal can help pilots more easily identify the runway and determine their position in relation to it, as they can recognize the unique timing of the light flashes. This characteristic ensures that the beacon is identifiable and serves its purpose effectively in guiding aircraft during approach and landing.

Contextually, options like 'Obscured', 'Open', and 'Operational' do not define the nature of the beacon's light characteristics. 'Obscured' would imply that the signal is hidden or blocked, which conflicts with the beacon’s purpose of providing a clear signal. 'Open' does not pertain to light characteristics at all, and 'Operational' refers to the status of the beacon rather than its light pattern. Thus, 'Occulting' is the term that correctly describes the specific visual pattern emitted by the runway beacon.