1、MIL-E-Y5725 LO W 7977706 0307273 2 - EL-E-45925 (WC) 29 April 1975 SUPERSEDING (See Section 6) MILITARY SPECIFICATION ELECTRONIC COMPONENTS ASSEMBLY, (11688148) This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 This specification covers
2、 one type of electronic components assembly (ECA) for use in the M28Ai. Helicopter Armament Subsystem. 2. APPLICABLE DOCUMENTS 2.1 The following documents, of the issue in effect on date of invitation for bids or request for proposal, form a part of the specifi- cation to the extent specified herein
3、: SPECIFICATIONS Military MIL-W-13855 MIL-P-14232 MIL- 1-456 O 7 MIL-A-45967 STANDARDS Military MIL-STD-105 MIL-STD-109 MIL-STD-781 - Weapons, Small Arms and Aircraft Armament Subsystem, General Specification For. - Parts, Equipment and Tools for Army Materiel, Packaging and Packing of. - Inspection
4、 Equipment, Acquisition, Maintenance and Disposition of. - Armament Subsystem Helicopter: M28A1 - Sampling Procedures and Tables for Inspection by Attributes. - Quality Assurance Terms and Definitions - Reliability tests: Exponential Dis tribut ion. I, Provided by IHSNot for ResaleNo reproduction or
5、 networking permitted without license from IHS-,-,-MIL-E-45925(WC) DRAWINGS Rock Island Arsenal FU688148 - Electronic Components Assembly IEL11688148 - Inspection Equipment List (Product drawings referenced in this specification form a part of 11688148; acceptance inspection equipment drawings form
6、a part of IEL11688148. ) PUBLICATIONS Rock Island Arsenal . PU688148 - Packaging Data Sheet for Electronic Components Assembly. (Copies of specifications, standards, drawings and publications required by suppliers in connection with specific procurement functions should be obtained from the procurin
7、g activity or as directed by the contracting officer . ) 3 0 REQUIREMENTS 3.1 First article Requirements for submission of the first article shall be as specified in the contract (see 6.2). Unless otherwise speci- fied (see 6.2), the first article shall include the pilot pack (see 5,l). S02 Material
8、, construction and design. The electronic components assembly (ECA) shall conform to the material, construction and design requirements specified herein, on Drawing F11688148 and in MIL-W-13855. 3.2.1 Weight. The weight of the ECA shall not exceed 13.6 pounds. 3.3 Functional requirements. 3.3,1 Powe
9、r input. supplied with 22-30 volts direct current (vdc) from the aircraft power supply or equivalent, with 115 (+4.5 -7.5) volts alternating current (vac), 40 5 20 hertz (Hz) from the aircraft inverter. Maximum current shall be 3.5 amperes (amps). The ECA shall function when supplied with 22-24 vdc
10、with not more than 10 percent degradation of performance for 3.3.2, 3.3.4,1 thru 3.3.4.6 and 3.3.5.9, 3.3.5,lO. Testing shall be as specified in 4.5 . 3 . 2 o The ECA shall perform as specified herein when 3.3.2 M= to DC converter, Converters (AlAl and AlA2) shall convert aircraft supplied power (22
11、-30 vdc) into a regulated +28 + .12 vdc and -28 + *12 vdc. outpt: shall be not less than +25.2 vdc and not more than -25.2 vdc. When the input power supply drops to 22 vdc, the regulated Testing 2 shall be as specified in 4.5.3.2. c Provided by IHSNot for ResaleNo reproduction or networking permitte
12、d without license from IHS-,-,-MIL-E-45725 LO 77797Ob 0309295 b 3.3.3 Power transformer. The power transformer shall transform the aircraft converter supply of 115 vac + 4.5 vac -7.5 vac, 400 Hertz (Hz) + 20 Hz primary power into 26 volt source and two (2) volt source, separated in phase by 180 degr
13、ees. - Testing shall be as specified in 4.5e3w 2 shall shall 3.3.4 Circuit card assemblies. The circuit card assemblies (CCA) incorporate the electrical functions described herein. be as specified in 4.5.3.2. Testing 3.3.4.1 Elevation demodulator detector circuit card assembly This CCA includes the
14、elevation channel preamplifier and (AlA5A5). demodulator circuits of the servo system and the coincidence amplifier. The input signals to the servo preamplifier shall include the sighting station elevation resolver output, the elevation stow adjustment, the pilot range adjustment and the gunner rang
15、e adjustment. These signals shall be summed and amplified and introduced to the demodulator which shall remove the carrier signal as the first stage in lead compensation signal processing. shall be 0,068 vdc per milliradian of error input. error shall be represented by a signal level of 10 millivolt
16、s (mv). Therefore a 10 mv rms, 400 Hz error signal input to the preamplifier pin D of Alp3 shall equal 68 mv (dc) level output from the demodulator pin M of A1J1. The saturation voltage output shall be 11 vdc. card shall contain a fixed elevation stow bias resistor. inputs shall be Introduced to the
17、 coincidence amplifier of the non- coincidence detection circuit. rectified for presentation to an electronic trigger circuit external to this CCA. degree of noncoincidence. milliradian equals 10 mv rms 400 Hz. coincidence equals 17.4 x 10 = 174 mv. occurs, there shall be 174 mv applied to the input
18、 of the coincidence amplifier (pin D of AlP3). be at a level of 1.4 vdc (pin H of AlJ1). A 5 to 8 degrees shall be an error of sufficient magnitude to energize the coincidence relays. This shall be equal to 1.4 x 5 + 3 - O = 7 to 11.2 vdc out of the coin- cidence amplifier . The scale factor for the
19、 preamplifier and demodulator One milliradian of This circuit The signal These signals shall be amplified and then The concidence amplifier scale factor shall be 1.4 vdc per One degree equals 17.4 milliradians and one Therefore, one degree of non- If one degree of noncoincidence The output of the co
20、incidence amplifier shall 3,3.4,2 Azimuth demodulator detector circuit card assembly (AlA5A2). This CCA which operates on azimuth data shall be identical to (AlA5A5) with the exception that there shall be no range data input in the azimuth channel. The input to the aximuth preamplifier of 10 mv (pin
21、 L of AlP3) shall equal 68 mv (dc) level output from the demodulator (pin L of AlJ1). The input to the azimuth coincidence amplifier of 174 mv (pin L of AlP3) shall equal a level of 1.4 vdc (pin G of A1J1) at the output of the coincidence amplifier. 3 Provided by IHSNot for ResaleNo reproduction or
22、networking permitted without license from IHS-,-,-MIL-E-45 9 25 ( WC) 303,4e3 Azimuth equalizer amplifier circuit card assembly (AlA5A3). This CCA contains the equalizer amplifier and the summing and power amplifier in the azimuth channel. the appropriate transfer function. from (AlA5A2) and an appr
23、opriate derivative of this signal shall be provided by the equalization amplifier and introduced to the summing and power amplifier. This signal shall be summed with the amplified tachometer output and the dither oscillator output and amplified to operate the azhuth servo valve. The amplifier provid
24、es a differential current over the two halves of the servo valve solenoid. The amplifier shall provide a quiescent current of 5 milliamperes through each section of the solenoid when the turret is holding an ordered position and shall be capable of delivering up to a minimum of 10 milliamperes throu
25、gh one section with zero current in the other section during maximum slew con- ditions. The equalizer, summing and power amplifier shall have a voltage gain of 0.8 from the equalizer input to a balanced output that is equiva- to the servo valves (1000 5100 ohms from each side to ground, pins P and Q
26、 of AlP3). on pin P shall increase 0.4 volts and the output on pin Q will decrease 0.4 volts nominal valves. AlJ1-L. the voltage gain to the output shall be 0.15 total swing. AlP3-v is in phase with A1J1-E and AlP3-F is 100 out of phase with AlJ1-E. The gain from the dither input AlJ1-N to either ou
27、tput will be .447 to total swing with the same phase relationship as for input A1J1-E. The equalization amplifier provides The demodulation (dc) input signal With a -k 1.0 volt on the equalizer input AlJ1-L, the output With an input on the summing and power amplifier Pin c 3.3.4.4 Elevation equalize
28、r amplifier circuit card assembly (AlA5A4). This CCA is the elevation channel counterpart of AlA5A3 with the exception that no dither signal input shall be provided. the elevation servo valve. The same gain and phase relationships shall hold for the elevation equalizer amplifier card as for the azim
29、uth equalizer - amplifier, except the output to the servo valves shall be on pins Fand G of AlPa. With a + 1.0 volt P-P on the equalizer input AlJ1-M, the output on AlP3-F will increase 0.4 volt and the output on AlP3-E will decrease 0.4 volt. gain to the output shall be 0.418 total swing. The outpu
30、t shall drive With an input on the summing and power amplifier A1J1-K the voltage 3 de-energize AlKl1 or Alu2 3.3.5.10 40MM burst limit relay (10 second) AlK10. This relay shali have a fixed time delay (10 seconds) upon receipt of the operate signal to limit the burst time of the 40mm weapons. be ac
31、tuated by either of the following: The A1K10 relay shall Upon Actuation of With 26 + 4 vdc Applied Interrupted by Actuation of I AlP4- AIK10 (relay may cycle) AlKl4, AlK12, Alu1 A1P 3-K De-energize AlK14, AlK12 or AlK11 3.3.5.11 Azimuth coincidence relay AlKl1, This relay shall be de-energized when
32、the signal resulting from azimuth noncoincidence attains the required level. (AlK8) coil into the flasher circuit and shall interrupt the firing circuitry. Ala1 is normally energized. The relay action shall switch the reticle relay 3.3.S012 Elevation coincidence relay AlK12. This relay shall de-ener
33、gize during elevation noncoincidence and shall produce the result as specified in 3.3,5.11. alsa be energized from a 28 volt signal applied to pin 5 of AlPl which simulates a condition where the gunners sight trigger switch is pulled before the action switch thus preventing firing before the out of
34、coincidence error can be acted upon. AlKi2 is normally energized. The relay shall 8 7 a Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. . _- - ML-E-45925 LO 999Ob 0309303 8 _- - MIL-E-45925 (WC) . 3,3,5.13 7.62MM - 40MM firing AlK13 and 40MM firing
35、 AlK14 relays. These relays shall be operated in parallel to provide sufficient contacts to perform the required functions. firing a 4Omm weapon or when two 40mm weapons are installed. shall assist the trigger logic circuitry. replace the 7.62mm range compensation resistors with the 40mm compensatio
36、n resistors in t.he range adjustment circuits when a 40mm weapon is being fired. The AlK13 and Alu4 relays shall be actuated by any of the following conditions; The relays shall be energized when AlK14 Ala3 shall simultaneously Upon Actuation of With 26 .+ 4 vdc Applied Interrupted by Actuation of -
37、 AlP3-T - A6K3 A1P 1- S A6K1 or A6K3 de-energized The action of AlK13 supplies 26 vac, 400 Hz to AlP2-E. 3.3.5.14 Pilot control relay AlK15. Actuation of this relay shall permit operation of the armament by the pilot (see 3.3.5.7). The AlK15 relay shall be actuated by any of ;he following conditions
38、: Upon Actuation of With 26 + 4 vdc Applied Interrupted by Actuation of - AlP4-Z Ala A1K8 AlPl-A A1K8 de-energized The actuation of the AlK7 or Ala5 relay shall apply 400 Hz to the power transformer AlTl. 3.3.5.15 Fail safe relay AlKl6. This relay shall be de-energized upon loss of the 115 vac, 400
39、Hz at AlP4-Xe The relay drop-out shall de-energize the Arming A1K3 and Turret Power AlK14 relays, disarming the system and providing a controlled shut-down of the turret action. 303,5,16 7,62MM trigger interlock relay A6K1. The contacts of this relay shall open-circuit the 40mm trigger circuit for t
40、he purpose of establishing trigger priority. The A6K1 relay shall be actuated by 26 c + 4 udc applied to AlPl-D, interrupted by actuation of A6K3. 3,3.5,17 Gunner action relay A6K2. This relay shall operate in parallel, with A1K1 (see 3.3.5.1) to provide additional contacts. The contacts shall intro
41、duce the pilot range compensation signal into the elevation preamplifier input of CCA AlA5A5. by 26 & 4 vdc applied to either AlPl-Y or AlP5-A. The A6K2 relay shall be actuated 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-E-45925 (WC) 3.3.5,
42、18 40MM trigger interlock relay A6K3. This relay shall operate in a manner similiar to AlA6K1, for the purpose of establishing trigger priority. circuit. AiPl-S, interrupted by actuation of A6U. The relay contacts shall open circuit the 7.62m trigger The A6K3 relay shall be energized by 26 5 4 vdc a
43、pplied to 3.3.6 Voltage out. 26 5 4 vdc shall be supplied to terminals AlP5-C, X and Y. Testing shall be as specified in 4.5.3.2. 3,4 Environmental conditions. When specified in the contract (see 6.2), the ECA shall be capable of satisfying the specific environ- mental conditions specified in MIL-A-
44、45967 for the subsystem. subjected to the environmental Conditions, the ECA shall not exhibit any detrimental damage or deterioration which would prevent acceptable per- formance. with 4.4. When Testing for environmental conditions shall be in accordance 3.5 Reliability. Nhen specified in the contra
45、ct (see 6,2), the ECA shall have a minimum acceptable Mean-Mission-Between-Failure (MMBF) of not less than 75 missions with a desired and specified MMBF of 112 missions. A mission is defined as those functions of the electronic components assembly necessary to simulate the expenditure of 4,000 round
46、s of 7.62 and 265 rounds of 40m ammunition during a two-hour flight. A failure will be defined as a nonoccurrence of the appropriate event when power is applied and the required control switches are actuated. shall be in accordance with 4.4. Testing 3,5.1 Reliability criteria, The above reliability
47、requirements are based on a minimum acceptable Mean-Time-Between-Failure (MTBF) of 150 hours. 3.6 Electromagnetic interference (EMI) . When specified in the con- tract (see 6.21, the ECA shall be capable of satisfying the specific EM1 requirements specified in MIL-A-45967 for the subsystem. subjecte
48、d to the EM1 requirements, the ECA shall not exhibit any detri- mental damage or deterioration which would prevent acceptable performance. Testing for Dl1 shall be in accordance with 4.4, When 3.7 Interchangeability. The six CCAs of the ECA shall be inter- changeable with CCAs of the same part numbe
49、r. specified in 4.5.3.3, Testing shall be as 3.8 Marking. Each ECA, CCA and parts for which markings are speci- fied shall be clearly marked in accordance with the applicable drawings and MIL-W-13855, assigned by the procuring activity (see 6.2). Each ECA and CCA shall be identified by a serial number 3.9 Workmanship. Workmanship shall be in accordance with MIL-W-13855. 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
