Final answer:
The question is about aviation regulations found in AFMAN 11-202V3, discussing the minimum altitude an aircraft should maintain during approach unless specific visual references are available.
Step-by-step explanation:
The question refers to regulations discussed in the Air Force Manual (AFMAN) 11-202, Volume 3, which deals with rules for instrument flight procedures. While the reference provided does not contain the specific numbers required to complete the sentence, it is typical in aviation to maintain strict altitude restrictions during approach to ensure the safety of the aircraft and its occupants.
Typically, a pilot must not descend below a certain minimum altitude, which might range from 1000 ft to 2000 ft above the touchdown zone elevation (TDZE) or threshold elevation, unless they have the runway or the specified approach lights in sight, ensuring there is adequate visual reference to continue the descent safely.
This regulation ensures that an aircraft maintains a safe altitude as it approaches the runway, providing an additional safety buffer in case of unexpected situations or deviations from the approach path. Pilots follow these rules to ensure they can safely land, taking into account visibility, terrain, and other factors at the airport of arrival.