How long is a Preflight Inspection valid if the aircraft has not flown?

The validity of a Preflight Inspection is generally recognized as lasting 72 hours, provided that the aircraft has not flown during that time. This timeframe is established to ensure that all safety checks and operational statuses of the aircraft remain current and valid. The 72-hour window allows for the possibility of maintenance, changes in conditions, or other factors that might affect aircraft safety. If an aircraft has not flown within this period, it is still considered safe for operation as long as no other inspections or maintenance issues have arisen.

In aviation, maintaining strict adherence to inspection timelines is crucial for safety, and the 72-hour guideline reflects a balance between thorough preflight evaluation and practical operational use.