What are the answers to questions 25-28 regarding MNPS/NAT HLA airspace, vertical separation, and OTS track times?

Here are the answers to questions 25-28:

25. In airspace where MNPS is applicable, the minimum vertical separation between FL 290 and FL 410 is: D) 1 000 ft Explanation: This altitude band (FL290 to FL410) is designated as Reduced Vertical Separation Minimum (RVSM) airspace, where the minimum vertical separation is 1000 feet.

26. MNPS airspace in the applicable areas of the North Atlantic is defined between the following flight levels: B) FL 285 and FL 420 Explanation: The North Atlantic Minimum Navigation Performance Specifications (MNPS) airspace, now known as the North Atlantic High Level Airspace (NAT HLA), extends from Flight Level 285 (FL285) to Flight Level 420 (FL420) inclusive.

27. In NAT airspace, Air Traffic Services may require any flight operating predominantly in an east west direction, north of 70°N, to report its position at any of the intermediate meridians spaced at intervals of: A) 5° of longitude. Explanation: While the standard reporting interval for intermediate meridians in the NAT region is 10 degrees of longitude, for flights operating north of 70°N, the interval is reduced to 5 degrees of longitude due to the convergence of meridians.

28. The validity period of a day time OTS in the MNPS airspace is normally, at 30°W, between: B) 1130 UTC to 1900 UTC Explanation: The day time Organized Track System (OTS) in the North Atlantic is for westbound traffic. Its validity period at 30°W is typically from 1130 UTC to 1900 UTC.