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REGULATIONS FLIGHT Section 3425A - Interpretation of Ceiling and Visibility Minimums for Landing Given in Weather Competency Letter. 1. CEILING: The minimum ceiling defines that altitudes above the terrain below which a flight shall not descend during final approach until maneuvering has been completed to line the flight up with the straight-in-path of intended landing. 2. VISIBILITY: The visibility as observed from the cockpit along the actual and intended flight path and between that at the minimum altitude or subsequent landing shall be less than the minimum altitude or subsequent landing shall be less than the minimum as specified in the individual airport specifications. Examples: Authorized minimum 400-1 Reported weather 400-1 (a) Instrument approach completed, contact established at 400 feet with cockpit forward visibility less than one mile. (1) Flight shall not descend below 400 feet to obtain required minimum forward visibility. (2) Flight shall not be maneuvered below 400 feet. (3) A flight is permitted to continue in straight flight at minimum altitude for the time limit specified in the procedure. If during this period visibility becomes at least one mile, flight may be maneuvered for landing. (b) Contact established at 400 feet with visibility one mile or more: If at any time after reaching minimum altitude, the visibility along actual or intended flight path or between the flight path and the airport, as observed from the cockpit, becomes less than one mile due to scud, precipitation or any other cause, the approach shall be abandoned. 5/3/41 Flight