How often must a pilot update their medical certification as per ICAO regulations?

The correct timeframe for updating a pilot's medical certification under ICAO regulations is every 365 days. This is pivotal to ensure that pilots maintain a level of medical fitness that allows them to operate aircraft safely. Regular updates help identify any potential health issues that could impair a pilot's ability to perform their duties, ensuring the continued safety of flight operations.

For commercial pilots, specifically those operating under Part 135, maintaining a valid medical certificate is essential as it is a regulatory requirement for their ability to fly. The standards set by ICAO focus on regular reassessment of a pilot's health to mitigate risks associated with flying while unfit.

Understanding this timeframe is crucial for pilots to plan their medical evaluations and remain compliant with international aviation regulations. Regular adherence to medical certification requirements not only affirms a pilot's fitness for duty but also upholds broader aviation safety standards.