A detailed written record of a flight rule deviation must be kept for how long?

The correct answer is that a detailed written record of a flight rule deviation must be kept for one year. This requirement is established to ensure that there is an accountable and traceable record of any deviations from standard flight operations. Keeping these records for one year allows for thorough review and investigation, if necessary, ensuring compliance with regulations and safety standards. It also helps maintain a culture of safety and accountability within aviation operations.

While options like six months, two years, or indefinitely might seem reasonable, they do not align with the regulatory framework that governs how long these records should be maintained. A retention period of six months may not provide sufficient time for proper review in case of incidents or audits. Conversely, two years or indefinitely might impose unnecessary burdens on operators in terms of record-keeping and storage, especially considering that one year is typically deemed adequate for oversight and regulatory purposes.