1、I . MaIGRCz6484Al - - ?dILR-24486(USAF) Superseding . . 2 June 1958 . . I MII;LTARY SPECIZCAT ION 1 - “* - . - .- . .- . - _I-_. RELIABILITY .REQmNTS FOR Dl3VZZ.m - - . .- - OF EIECTRONIC SUBSysTEbiIs OR EQ- -L. -. 1, SCOPE 1.1 This specification details the minimum req-mehs that.in.g officer.) K* .
2、 -. . -._ _ .-d.- ,- . . . .-_ .-.- .- 3. REQumrbENTs .-I- II.:.:-:.:. 3.1 Every reasonkble effort shall be expended during all sfage6 . -_. . .-.- practicable degrae of reliability. Specifically, the design shall be auch . - . - . . under the applicable stress coaditions, c “. - - . - -. . - - - 1
3、. I._ . - .- . . Ar Ilooven-Drylon CO. o 1 March 1962 1030 -,- . THIS DOWMENT CONTA!$ / ? PAGES, GL $!,5y . _ .- , . ., . . . - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-.-_-.-*-_ - , . - -_I-_ . -. MIL-R-2b44A bb m 77777Ob 0334254 4 m -. I. _.
4、 *. -. . . . I_. . . , . . . . i. . . *- .-U . -.- _. ._- . . .- 1_- . I . . _I-f.-._- . 1-11-11-. . . . . . . . .- _“ . .- . . . . ._ . . . . * . -._-.- - . i; . . . - _. “ . . . i: . . . p.: .,! .:.?:.: 2,. L . . , -.: Provided by IHSNot for ResaleNo reproduction or networking permitted without li
5、cense from IHS-,-,-Standard parts shall 5e used vhenever practicable. sbnddiaation, it should be definitely understood that it is no% intended that progress in the state-of-the-art be im,neded by blind or arbitrary employment of standards rrhere significant gains could be made othen7ice; Only those
6、parts that have characteristics that fulfill all circuit require- ments including anticipated stress levels shall be.used, Due regard shall be given to all parts linitetions ,- and the more probRle-cauces and tps of failure. In the matter of _._._ .- -. . .- . ._-_,. . . _._.- . . _-. . . i . _. . .
7、 .-.I _ . . 3.3.3 Maintenance,- Design of the equipment shail be such that fixad tims for preventive maintenance cen be established whereby specific repairs can be made that will provide an additional period of reliable servi-. life. The contractor shall specify a7propiate maintenance periods an.hic
8、h such conditions are expected to OCUF. . 3.3.5 Relitzbilltv v3 Detailed Rea-lirementg.- The contrcctor shall gi-te proper consideration to the ecsentielity of all of the various feati;r!?o, fumtiono, and configurations of the propse design. Each desip. shall ke thoroughPJ studied with the specific
9、purpose of r-ducing com71zxity and increasing reliability. Performmce of the equipmmt aver and nbwre the essential design chmacteriatics (frcqtiency range, poner mtput, accuracy, etc) mst be balanced against the reliability r-q uircmento to ?ravido an oflimm overall result. hrge conccssions in perfo
10、pmame t6 yield small improvenents i:i reliability arc not desirable. Such other factors as maintainability, procurabilit;l, cost, verriatility, stcnddj.- zation, tine scheduling, etc, must be considered, . 3 . _ .I. . . I - -.- _. - _ . . . . . . . - . /a . . . . 1 *.:-: Provided by IHSNot for Resal
11、eNo reproduction or networking permitted without license from IHS-,-,-MIL-R-2bY84A bb 7399906 Olt34258 I . - . . . . , . i * necessary . necessary _. Failure muaher Failure analysis mbr Date Part name Part number and symbol St:bas eombly Ma3 or a8 8 embly Serial number of equipmnt Hoixrs of operatio
12、n (both equipmrrb and fcrtal accumulated) Hode of operation, if applicable Manufadurer of failed part I Symptom of failure Cause of failure Corrective ac+,ion for test continuation Diagnosis tine for each skill level (include only Repair and retest time for each skill (include on* Categorisation of
13、failure Result of failure (cata:;zz-:.y .: . . . .- I._ . . F . . A . . I . 1:;:;: ,. - . . .-. . . t . . = -. . . . I . r. . . i . . -. LI .-.- . 11_1_. . ._- . ._. -._ - -.-._._ . _. . . ,. . L. . . ,. . ,., . i . - . . - . ,. I . -. b: - I._ _.- I . . -. . ; . . . - I _ “- , . .- . . : . . : . .
14、. :x:“. . _. . ._. -. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I -. . MIL-R-Zb44A bb 97979Ob 0334262 3 m t- _. I . -. . . _. - _-. 1 .- - MTL-R464( USAFI On-off cycling: In accordanco with-figure 1 4.3.2.3 Teat Cive . . . O -2 -percent ment ex
15、posed to similar emdronrrtental conditions: Cycling from -54*C to +%OC, in accordance with figure 1 _ 10 mimrtee of ench hour of 6 tine at any frequency in the range of 20 to 60-cps at an acceleration of . -_ . _ - . I.I . -_ .-I. Provided by IHSNot for ResaleNo reproduction or networking permitted
16、without license from IHS-,-,-I MIL-R-264B4A bb W 777770b 0334263 5 W Y Stabilization points operators log; equipment failure log; and a failure diagnosis and corrective cctlon report shall be kept. 4, and 5 as a minimum. The exact format may be =ranged to suit individual The forms shall contain the
17、data shorn on figures 2, 3, requirements , 8 ilQ 1 . - 1 4*4 lmnevjts Test,- Trro equipments, sabjected to the MTBF test, shall be subsequently continued under test using the same test aycle for the total operating time apecified for longevity. . ).-.I. . t:IT:lf:IIII,:x:z: ,._ . - . ;: .-.2-.-.*.-;
18、 . . . . e .- - -.- _-_._.- ,_ “._.“ . -.- . . . . .-. - ,.-,-* - . . . . _._._I. . ._.- . CI-.- +.-. I . ,- . -.- . -._ ,. ,-. . - . _._ . . . -.-. . . . - *_.-.- . - ,.- -.-.-. -,. , ) . . - . . . -. . . - . . . . . . ._. _. . .- . . ._ . _. .-. - . . .-.s I . . - _ . _ 4*5 -of th! EnEF tests and
19、subsequent to finalization of .the design, the contra.rtor shall conduct a thorough paper revienr of the deeign relativa to effects of - . . parts tolerances and variation6 due to sging, effects of enviromental and electrical stress, and evalwtion of all other factors that :.; t _. . . i.- ,-. .- -
20、_._ . , . .- Deviations to pre6cribed requirements or - . 4.6 t . . . . . . . -. . , ._I_- -.I- I j i ,. ,- ._- :.i; . . . . . . , . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. . - d. establishment of reliabllity proc8durese This document ia ma
21、ilable fkom the Superirrterdsnt of Documents,? Government Printing Wfice, Raahngton 2S0 D. Ce I. . . . . . _._I - - . - -. i . _-_. - - . i . ,. - I II 5.4 Vibretion Tes$.- 1% is not Intended that a 7bretlon CO te sting machine be used for performing the 10-minute int mitteat vibration required by t
22、he test vcle specified herein. A suitable platform nay b mounted on .vibration isolators and EI motor with an oscentrio drive or other. 43imple yvfbratlng device may be used to sMe this platform with the sample equipment mounted thereon, The test setup used is mbjeot to approval 0.t the procuring mt
23、iv.t. NUIICEt When Got.emunent and the fact that. . the Government may have fommrlated, *+nished, or in my way eupplled the said drawings, specifications, or other data is rat to be regimed by implication or otherwise as in any manner licensing the holder or any other person or corporation or convef
24、lng any rights or pd8SiOn to mufacture, use, or?sell any patented invention that may in any way be( related themtoo I. I . 8 _. . :. 4 ? RADII 17 . kI_.-II . i- I - ?_ -.-.- -._.- -.-. . .- -. -._._._. . .-.-_- _ . I.1.I . . . .-.- 1:x-: .=:? . I , ,. . . .- . . . . - . -. ,.- . . c . . . -.- _._.-_I- . . . . . . . I . t: I . 6 . , . . t L .-. . . . . . ? -_ - .-.-.-I . _- -.- . . . . ., . . . . . I & ._._I_. _.- -.- .-.-.- . ?.I. . ,- - _-.- . _ . -_._ -.- _- -1.- -. .I.-.- . - ,- . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
