MS26578B (AMENDMENT 1), MILITARY STANDARD: LIGHTS, MARKER, AIRPORT, SEMIFLUSH, BASE MOUNTED, BIDIRECTIONAL AND UNIDIRECTIONAL (05 SEP 2002) [NO SUPERSEDING DOCUMENT]
MS26578B (AMENDMENT 1), MILITARY STANDARD: LIGHTS, MARKER, AIRPORT, SEMIFLUSH, BASE MOUNTED, BIDIRECTIONAL AND UNIDIRECTIONAL (05 SEP 2002) [NO SUPERSEDING DOCUMENT].