Details of Electrical and Electronic Apparatus with Applications in the Maintenance and Operation of Aircraft, Missiles and Space Vehicles. A new medium‐tolerance time delay has been introduced by M. L. Aviation Co. Ltd. for use over a temperature range of minus 65 to plus 70 deg. C. The initial range will cover input supplies of 18 V d.c. to 29 V d.c. with a current rating of 3 amps. The units incorporate a semi‐conductor circuit which operates an electro‐mechanical switching relay, all housed within a hermetically‐scaled container. Power consumption, with the relay energized, is 7 watts and the unit automatically rescts when the supply voltage is broken. Maximum pulse frequency is dependent on the ambient conditions; 1 –5 sec. on and 10 m./scc. off at minus 65 deg. C, and 1–15 sec. on and 10 m./sec. ofT at plus 70 deg. C. for a 29 V d.c. unit. Alternative types are also offered for a.c. operation up to 50 V r.m.s. and delays of up to 10 sec. All delays can be supplied fully tested to climatic and vibration specifications D.T.D.1085B and Av.P.24 (Engine Bay) for aircraft use.
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