ATPL: The validity period of a day-time organised track system in MNPS (Minimum Navigation Performance Specification) airspace is normally, at 30°W, between:
Question 10, Operational Procedures - ATPL - Airline Transport Pilot license
Explanation: The validity period of a day-time organised track system in MNPS (Minimum Navigation Performance Specification) airspace is normally, at 30°W, between: