MIL-R-19309D
3.4.4 Mechanical design.
3.4.4.1 Type. The relay shall be the self-aligning type, and shall remain in adjustment in any position.
3.4.4.2 Coil mounting. The coil of the relay shall be mounted in such a manner that it will not loosen or become displaced by any tests of environmental conditions described herein.
3.4.4.3 Adjustments. All adjustable features of the relay shall be so designed that the setting of any adjustment will not be altered by any tests or environmental condition described herein. There shall be no external adjustments.
3.4.4.4 Enclosure. The relay shall be sealed. The term "sealed" is construed to cover all methods of sealing; namely, vacuum or atmospheric, and pressurized with dry air or inert gas. When tested as specified in 4.4.5.3, the sealed relay shall show no evidence of leakage.
3.4.4.5 Mounting. The relay shall be mounted by two number 4-40 studs, located as shown on Drawing 1521140.
3.4.5 Electrical design.
3.4.5.1 Contacts. The contacts of the relay shall be of the proper size, material, and type to carry, to make and to break the rated current. The contacts shall be securely fastened to the stationary and movable current-carrying members.
3.4.5.1.1 Contact rating. The rated current of the contacts shall be 2.0 amperes at 28 volts resistive load.
3.4.5.2 Contact arrangement. The contact arrangement of the relay shall be double-pole double-throw, as shown in Drawing 1521140. With the relay coil deenergized, contact 4 shall be closed to contact 3, and contact 8 shall be closed to contact 7. The schematic diagram of the relay shown on the above drawing shall be included in the marking of the relay (see 3.3.7.1) in Area A.
3.4.5.3 Coil. The coil of the relay shall be evenly wound and properly insulated from the frame and other grounded parts.
3.4.5.4 Case. The case of the relay shall not be used for grounding nor shall it be electrically connected to any terminal of the relay.
3.4.5.5 Terminals. Eight J-hook type terminals, each capable of accommodating two number 18 wires, shall be provided and located as shown on Drawing 1521140. Terminals shall be hot-tin dipped or solder tinned.
3.4.6 Welding. All welds shall be of ample size with through penetration and good fusion, and shall be substantially free of injurious scabs, blisters, abnormal pockmarks, bruises, or other surface defects. Welds shall be capable of withstanding a strength test to destruction in which failure shall not occur within the weld itself. There shall be no evidence of harmful effects due to the welding process on the material adjacent to the weld. All welds shall be cleaned of scale, oxidation products, and excess flux by sand blasting, wire brushing, buffing, or other suitable
means. Surfaces cleaned with acid shall be completely neutralized. Where tack or spot welds are employed, the number of welds shall be sufficient to provide adequate strength; at least two welds shall be used to hold any part.
3.4.7 Soldering. Only class SN60 solder in accordance with ANSI-J-STD-006 shall be used for electrical connections. Soldering processes shall be according to best commercial practices. No assembly shall depend solely on soft solder for mechanical strength except for relatively light parts which have by actual use proved to be suitable.
3.4.8 Brazing. All brazed joints shall be in accordance with best commercial practices and shall be of ample size to meet the individual requirements of the parts concerned.
3.4.9 Riveting. Riveting operations shall be carefully performed in order to ensure that the rivets are tight and satisfactorily headed.
3.5 Performance requirements and product characteristics. The relay shall meet the following performance requirements and product characteristics.
7
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business