If an Aerodrome has no published frequency, which frequency should a pilot use?

When an aerodrome does not have a published frequency, the appropriate frequency for pilots to use is typically 122.2 MHz. This frequency is designated as a common traffic advisory frequency (CTAF) and is widely used at uncontrolled airports. It allows pilots to communicate their intentions to other traffic in the area, promoting safety and situational awareness.

In the context of an aerodrome without a published frequency, using 122.2 MHz enables pilots to report their positions, intentions, and any other pertinent information while in the vicinity of the aerodrome. This practice helps create a self-announce system that is critical for maintaining safety in areas with no air traffic control presence.

The other frequencies listed may serve specific purposes but are not standardized for common use at uncontrolled airports. 121.5 is the international distress frequency, while 126.7 and 123.2 MHz are often used for other specific operations or locations, but they do not fulfill the role of a common frequency for communicating at an aerodrome without a published frequency.