MIL-C-6499E, MILITARY SPECIFICATION: CLOCK, AIRCRAFT MECHANICAL, TYPE A-13A (07 JUL 1970) [NO S/S DOCUMENT]

MIL-C-6499E, MILITARY SPECIFICATION: CLOCK, AIRCRAFT MECHANICAL, TYPE A-13A (07 JUL 1970) [NO S/S DOCUMENT]., This specification covers the requirements for an unlighted mechanical aircraft clock having a l-7/8-inch dial and a l-hour elapsed time capability, designated as Clock, Aircraft, Mechanical, Type A-13A.