NAVY MIL-P-81911-1972 PARALLEL FREQUENCY-CODED FIRING SYSTEMS《同步频率编码发射系统》.pdf

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1、MIL-P-L711 12 W 9777706 0360076 7 W MIL-P-81911 (AS) 30 November 1972 MILITARY SPECIFICATION PARALLEL, FREQUENCY-CODED FIRING SYSTEMS This specification has been approved by the Naval Air Systems Command, Department of the Navy. 1. SCOPE 1.1 Scope - This specification covers the general requirements

2、 for a parallel, frequency coded firing system consisting of one encoder and one or more decoders. Procurement of system components requires additional data provided on component drawings listed in Data List DL 15bASlOO. 1.2 Classification - me parallel frequency coded-firing system is installed in

3、an aircraft weapons-release circuit and ccnsists of one encoder connected in pasallel with-from l to 15 decoders. These components are installed in weapon- release circuits of military aircraft to prevent accidental weapon release. 2. APPLICABLZ DO(X“TS 2.1 General - The following documents of the i

4、ssue in effect on the date of invitation for bids form a part of this specification to the extent specified herein: SPECIFICATIONS Wiring: Aircraft, Installation of Electronic Equipment , Aircraft, General Specification for Electronic and Electrical Equip- ment, Accessories and Repair Parts; Packagi

5、ng and Packing of Military MIL-W-5088 MIL-E-5400 MIL-E-175 55 FSC-1280 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-BLSLL LE! W 7777906 0360077 7 MIL-P-81911 (AS) MIL-T-18.303 MIL-N-18307 STANDARDS Military MIL-STD-461 MIL-STD- 7 O 4 MIL-STD

6、-781 MIL-STD-794 MIL-STD-810 DATA LISTS Naval Air Systems Command DL 154ASiOO DRAWINGS Naval Air Systems Command 127AS130 2.1.1 Availability of Documents - Test Procedures: Preproduction and Acceptance for Aircraft Elec- tronic Equipment, Format for Nomenclature and Nameplates for Aeronautical Elect

7、ronic and Associated Equipment Electromagnetic Interference Characteristics, Requirements for Equipment Electric Power, Aircraft, Charac- teristics and Utilization of Reliability Tests , Exponential Distribution Parts and Equipment, Procedures for Packaging and Packing of Environmental Test Methods

8、Frequency Coded Firing System (Paraliei System) Test Procedure , MIL-STD-704 Spike Voltage Test (i) When requesting specifications, standards and publications, refer to both title and number. applicable specifications required by contractors in connection with specific procurement functions may be o

9、btained upon application to the Commanding Officer, Naval Supply Depot, Code 105, 5801 Tabor Avenue, Philadelphia, Pennsylvania 19120. Copies of this specification and Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-8LSLL 12 797990b 0360078 O =

10、 MIL-P-81911 (AS) 3. REQUIRENENTS 3.1 Quality Assurance - This specification makes provision ror Quality Assurance testing. 3.2 Pasts and Materials - In the selection of parts and materials, the requirements of MIL-E-5400 shall be complied with. objectives shall be the prime consideration. Fulfillme

11、nt of major design 3.2.1 Nonstandard Parts and Materials Approval - Approval for the use of nonstandard parts and materials shall be obtained as outlined in MIL-E-5400. Design and Construction - The equipment shall conform with all the 3.3 applicable requirements of MIL-E-5400 for design, constructi

12、on and :forkmanship except as otherwise specified herein. 3.3.1 Reliability - 3.3.1.1 Operating Life - Each component of -the parallel, frequency coded firing system shall be capable of operating i29,OOO times during its operating life when tested and accepted as outlined under 4.5. 3.3.1.2 Reliabil

13、ity in Mean Number of Firings Between Failure (MFBF) - The capability of each component of the parallel, frequency-coded firing system to operate lO8,OOO times between failures shall be demonstrated as outlined under 4.4.3. 3.3.2 Cabling and Connections - The equipment shall provide for the use of c

14、ables and connectors in accordance with MIL-E-5400. 3.3.2 Interconnection Cabling - The equipment shall be capable of satis- factory operation using external wiring in accordance with the applicable require- ments of MIL-W-5088. minimum number of the individual wires may be shielded when demonstrate

15、d as necessary to meet interference control requirements, and provided the assembly of the cable to its plugs may be easily accomplished. of the connectors attached to the cables shall not be supplied as part of the equipment. 3.3.3 The external wiring shall be unshielded, except that a External cab

16、les and that portion Interchangeability - The equipment shall meet the interchangeability requirements of MIL-E-5400. 3.3.4 Interference Control - The generation of radio interference by each component of the frequency-coded firing system and the vulnerability of the system to radio interference sha

17、ll be limited to the requirements of MIL-STD-461 for Class ID Equipment. requirements. Transient loading conditions shall be exempt from the test 3.3.5 Nomenclature and Nameplates - Nomenclature assignment and nameplate approval for equipment identification shall be in accordance with MI-N-18307. 3.

18、3.6 Standard Conditions - The following conditions shall be used to establish normal performance characteristics under standard conditions, and for making laboratory bench tests. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-BLSLL 12 999770

19、6 0360077 2 MIL-P-$1911 (AS) Temperature Room ambient (30 5 10C) Altitude Test Facility ground level Vibration None Humidity Room ambient up to 90% relative humidity Input power voltage 27.5 5 0.5 VDC Service Conditions - Encoders shall operate satisfactori3y under any of 3.3.7 the environmental ser

20、vice conditions or reasonable combination of these conditions as specified in MIL-E-5400 for Class 2 equipment except as modified herein. shall operate satisfactorily under any of the environmental service conditions or reasonable combination of these conditions as specified in MIL-E-5400 for Class

21、3 equipment except as modified herein. Decoders 3.3.7.1 Vibration - Frequency-coded firing systems shall operate satisfactorily when subjected to the vibration requirements of Curve AT of MIL-STD-810. ment except the encoders shall be subjected to the additional requirement of 0.20 inch double-ampli

22、tude between the frequency range of 5 to i5 Hertz. All equip- 3.3.7.2 Temperature - Unless otherwise specified by the encoder or decoder individual drawing, the maximum operating temperature for encoders shall be in accordance with MIL-E-5400 for Class 2 equipment, and the maximum operating temperat

23、ure for decoders shall be in accordance with MIL-E-5400 for Class 3 equipment. 3.3.8 Warm-up Time - Parallel, frequency-coded firing systems shall be capable of operating with less than one second warm-up time. 3.3.9 Input Electrical Power - 3.3 9 1 Operating Power - Parallel , frequency-coded firin

24、g systems shall meet all applicable requirements of MIL-STD-704 without being damaged, and shall provide SpeciBied performance when supplied with power having characteristics as defined in MIL-STD-704, Category B (30 volts maximum, 21 volts minimum). Degraded performance will be permitted for voltag

25、e transients not exceeding 0.5 second during normal electric system operation. Operation shall return to normal with no resulting damage to the equipment. The transient 28 volt d-c requirements of MIL-Sa)-704 shall be testkd in accordance with 127AS130. power bus shall not exceed 28 watts. during we

26、apons release. circuits; therefore, no power is required from the aircraft power bus for decoder operation. supply, to provide the load currents specified on the individual decoder drawing. Performance - Unless otherwise specified, values set forth to establish The power required fromthe aircraft Po

27、wer is required intermittently by the encoder The decoders function as switches in the weapon-release Vendors testing decoders shall have available a regulated, d-c power 3.4 the requirements of satisfactory performance apply to performance under both standar and edreme service and input-power condi

28、tions. extreme conditions is acceptable , tolerances or values setting forth acceptable vari- ations from the performance under the standard conditions will be specified. When reduced performance under the ,-_l , -_1 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without lice

29、nse from IHS-,-,-n;-81911 (AS) 3.4.1 Parallel Frequency-Coded Firing System Performance - Parallel, fkequency- coded firing systems shall perform in accordance with the following: (1) The encoder shall be capable of operating as many as 15 decoders simultaneously within any operating and loading con

30、dition specified on the individual decoder drawing. The peak surge voltage resulting from the decoder load interruption shall not exceed 60 volts at the decoder d-c voltage output under normal system operating conditions. The operating frequencies of the encoder and decoder shall be 7.00 2 0.24 KHz,

31、 and should be in accordance with controlling procurement drawings. The system shall be capable of controlling the firing of weapon electro-explosive devices. firing devices and wiring are specified on the individual decoder drawing. (2) (3) (4) Loads equivalent to aircraft weapons 3.4.1.1 Parallel

32、System Decoder Performance - The output and load of decoders used in parallel, frequency-coded firing systems shall be as specified on the indi- vidual decoder drawings. 3.4.1.2 Paralei System Operating Sequence and Bce of Operation - The operating sequence and cycle of operation for a parallel in a

33、ccordance with the following: frequency-code this.voltage shall be removed at the end of the test period. “he system shall be operated six times per ininute for life and reliability assurance testing. (2) 3.5 Detail Requirements - 3.5.1 Encoders and Decoders - Encoders and decoders for parallel, fre

34、quency- coded firing systems shall be manufactured to meet the requirements of the drawings listed in Data List l54AS100. 3.5.2 Connectors - Encoder and decoder external connectors shall mate with the applicable mating connector specified on the individual encoder and decoder drawings. 5 Provided by

35、 IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-81911 (AS h. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection - Unless otherwise specified in the contract or purchase order, the supplier is responsible for the perfoxmance of all inspection r

36、equirements as specified herein. utilize his own facilities or any commercial laboratory acceptable to the Government. The Government reserves the right to perform anyof the inspections set forth in the specification where such inspections axe deemed necessary to ensure that supplies and services co

37、nform to prescribed requirements. Except as otherwise specified, the supplier may 4.1.1 Classification of Tests - Items covered by this specification shall be subjected to the following tests , to determine compliance with all applicable requirements. Preproduction (First Article) Tests Initial Prod

38、uction Tests Acceptance Tests Life Tests 4.2 Preproduction (First Article) Teshs - Preproduction tests shall be conducted by the contractor on four equipments representative of the production equipments to be supplied under the contract. approved test procedure of 4.6, The Government inspector and t

39、he procuring activity shall be advised when tests are to be conducted, so that a Government representative may be designated to witness or supervise the tests when so desired. having adequate facilities to conduct all required tests shall obtain the services of a comercial testing laboratory accepta

40、ble to the Government. Preproduction tests shall be accomplished under the Contractors not 4.2.1 Preproduction (First Article) Test Data - The contractor shall submit all data collected in conducting these tests to the procuring activity for review. 4.2.2 Scope of Tests - Preproduction tests shall i

41、nclude all tests deemed necessary by the procuring activity to determine that the equipment meets all the requirements of this specification, other applicable specifications, and the contract. Preproduction tests shall include environmental tests in accordance with the procedures of MIL-sm-810 and a

42、s modified in table I. satisfactorily under any of the environmental service conditions specified in table I. The equipment shall be operated at the beginning and conclusion of each service condition, to verie whether a failure occurred during the service condition. during testing shall be made when

43、 specified by the test method of MIL-STD-810. outputs shall be monitored during operation, to verify that output voltages are present only when the prescribed inputs are present. operation shall be as specified in 3.4.1.2. The equipment shall operate Additional operation The The operating sequence a

44、nd cycle of 4.2.3 Preproduction (First Article) Approval - Approval of the preproduction saniples shall be by the procuring activity upon satisfactory completion of all tests. No production equipments shall be delivered prior to the approval of the preproduction smples. Prefabrication of production

45、equipment prior to the approval of the prepro- duction samples is at the contractors own risk. shall be retained by the contractor for his use in the fabrication and testing of equipment to be submitted for acceptance. The preproduction samples shall not be deliverable under the contract. The approv

46、ed preproduction samples 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-m al .P 7 H v3 rial IAk OaJ so a3 $1 H Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-8LSLL 12 m 777770b 0360083 4 m M

47、IL-P-81911 (AS) 4.2.4 Production Equipments - Equipments supplied under the contract shall in all respects, including design, construction, workmanship, performance and quality, be equivalent to the approved preproduction sample. of successfully passing the same tests as imposed on the preproduction

48、 sample. Evidence of non-compliance with the above shall constitute cause for rejection, and for equipment already accepted by the Government it shall be the obligation of the contractor to make necessary corrections as approved by the procuring activity. Initial Production Tests - Four of the first

49、 25 production equipments shall Each equipment shall be capable 4.3 be selected and sent at the contractors expense to a designated Government laboratory for tests. equipment has successfully passed all individual tests. conducted on the equipment prior to starting the Initial Production Tests. preproduction sample shall not be selected for this test. This equipment shall be selected by the procuring activity after