SAE AS 81587-2000 pdf download Timer Assembly Rain Repellent
This specification covers the requirements for an interval timer for controlling the duration of anelectrical pulse to a solenoid valve for use in Rain Repellent systems covered by SpecificationMIL-R-81589.
2. APPLICABLE DOCUMENTS
2.1The following documents, of the issue in effect on the date of invitation for bids, form a part of thisspecification to the extent specified herein:
Specifications
Military
MIL-C-5015MIL-E-5272
Connectors，Electric，“AN”Type
Environmental Testing, Aeronautical and Associated Equipment, GeneralSpecification for
MIL-E-5400MIL-E-17555
Electrical Equipment, Airborne, General Specification forElectronic and Electrical Equipment and Associated Repair Parts, Preparation
for delivery ofMIL-R-81589Rain Repellent Fluid Application System, Aircraft Windshield
Federa
PPP-T-0060Tape, Pressure Sensitive Adhesive-Water Proof
Standards
MIL-STD-105Sampling Procedures and Tables for Inspection by AttributesMIL-STD-129Marking for Shipment and Storage
MIL-STD-130ldentification Marking of U.S. Military Property
MIL-STD-171Finishing of Metal and Wood Surfaces
MIL-STD-454Standard General Requirements for Electronic Equipment
MIL-STD-461 Electromagnetic Interference Characteristics, Requirements for EquipmentElectric Power,Aircraft, Characteristics and Utilization of
MIL-STD-704MIL-STD-831MS-3102MS-3106MS-29527
Test Reports, preparation ofConnector,Receptacle, Electric Box MountingConnector,Plug,Electric,StraightValve, Fuel Shut Off, Solenoid Operated 28 Volts DC
Copies of specifications, standards, drawings and publications required by contractors in connectionwith specific procurement functions should be obtained from the procuring activity or as directed bythe contracting officer.)
3. REQUIREMENTS:
3.1 Preproduction:
This specification makes provision for preproduction testing.
3.2 Parts and Materials:
Approval for the use of non-standard parts and materials other than microelectronic devices shall be based on Category II of Specification MIL-E-5400.
3.2.1 Non-Standard Semiconductors: Approval for the use of non-standard and non-preferred semiconductors shall be in accordance with Military Standard MIL-STD-454, Requirement 30.
3.2.2 Vacuum Tubes: No vacuum tubes shall be used.
3.3 Design and Construction:
The timer shall be a complete, self-contained unit consisting of an interval timing circuit, electro- mechanical or solid state, a connecting receptacle and an enclosure. Design shall conform to the requirements of Specification MIL-E-5400. Workmanship shall conform to Military Standard MIL-STD-454, Requirement 9. Electromagnetic relays shall comply with Military Standard MIL-STD-454, Requirement 57.
3.3.1 Weight: The total weight of the timer shall be a minimum consistent with good design and shall not exceed 0.5 pound.
3.3.2 Container: The timing circuit shall be enclosed in an aluminum alloy container cylindrical in form with a maximum outside diameter of 1 -3/4 inches and a maximum length of 2-5/8 inches, not including the connector. The container shall be finished in accordance with Finish Numbers 7.1 .1 plus 21 .3 of Military Standard MIL-STD-1 71 , Black No. 27038. A 1 /4 inch diameter hole may be provided in the container for access to the timer adjustment. The hole shall be covered with pressure sensitive, water-proof, adhesive tape, Specification PPP-T-0060, Type I, Class I and sealed with one coat of shellac.
3.3.3 Operating Power: The timer shall provide the specified performance when energized from a 28 volt d.c. power source with power characteristics conforming to Military Standard MIL-STD-704 for Category B utilization equipment. The electrical load for the timer operation is defined by solonoid valve, Military Standard MS-29527-1.
3.3.4 Timing Circuit: The timing circuit shall provide a 28 volt d.c. pulse to a solenoid valve which conforms to Military Standard MS-29527-1 . A single timed pulse shall be initiated by a 28 volt d.c. electrical pulse not longer than 0.5 second duration. The timed pulse from the timer shall be adjustable from 1 .0 to 5.0 seconds. The timer adjustment shall be accessible with the timer assembled. The timer shall not be capable of automatic recycling. The timer shall be set by the contractor to the time interval specified in the procurement document.