1、MIL-R-38957C LO W 7997906 0305557 L W - f.i1-3895C (WAF) 18 April 1973 . . *.I. na . . . :.i:.: : :y . i . . i. . . . _ -. I._ . . - . . 30 April 1969 -*- I _ -,.- . .-. _- . -. . . . . . I . . _. . t.- _ l.-.- , .-.- . I. -_-I-.- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - _.
2、, . - - : :I“. - ._ -_ . .-. -. -_._ . . . . . . - . ._. - -I. -.- _ - . _._-_I-_ . ._-.- -_. . -_ -. _._._. _ . .- . - . . . 11_ , . )_ -_ -I-* _ - -. - I4ILITAXY SPZCIFICATI OE RACK, BOE3 EJECTOR, AIECRAFT XAU-4O/A *i. SCOPE 1.1 Scope. This specification covers the requirements for one type of equ
3、ipment designated as FLack, Bomb Ejector, Aircraft MAU-LO/A, hereafier referred to as the rack, for carriage and release (either freefall or forced ejection) of stores up to and including the 5000 pound blass. *2. APPLiCABLE DOCUPiENTS 2.1 invitation for bids, form a part of this specification to th
4、e extent The following documents, O the issue in effect on %he date of specified herein. SPEIFICATIONS Federal . 1 . . . PPP-B-601 PPP-B-636 PPP-C- 843 Military MIL-D-I O00 XIL-T-7743 Boxes, Wood, Cleated-Plywood Boxes, Shipping, Fiberboard Cushioring I4ate rial, CeUul3 se Preservation, Neihodc Of D
5、rawings, Engineering 2nd Associated Lists Yestine, Store Suspenslon Equipment, General Specificatlon Por Quality Control System Requlrements Calibration Systezl Requirements ESC 1095 “ . ,_._I C-. , . 1 . _. - - _.-. - _-_.-._1-. _. -.- . _._. . .- . . . . . . . . . . . . . . . I i - . . .- . 1 . .
6、1 . . . . . , THIS DOCUMENT Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-38957C LO 9997706 0305558 3 m . _ . - -. - - . MIL-R- 38 957C (USAF ) . STANDARDS Iclitary . . . .-. . -. - . . .- . . _ - . . . - . .- . -._ - . - . . . .- -.- - - - -
7、 . -.- .-.- - . . -.- . . - f. !. i -.* - . -. ._-. ” . . _ - . . . . . . . . . . . . . . . I Order cf Frecedence or the Selection o Test Hethods for Electronic and Electrical Component Parts (For Systems and Equipment) Environmental Test Hetihods or Aerospace and Ground Equipment Blocking, and Wate
8、rproofing; with Apgropriate Test Kethods . . _.,- . i . . *-.- . I._ . -. - . - . . -_. _._. _-.- -. .- -.- C _-_ .-. _ -.- . -.- . -.- . - . . i ,-._ . - - A E DRAILINGS Air Force Rack, Bomb Ejector, Aircraft ItAU-hO/A, Assembly of Electrical Assembly and Schematic, 14 Inch and 30 Inch Bomb Ejector
9、 Rack (Copies. of specifications, standards, drawings, and publications required by sumliers in connection with specific procurement functions should be obtained frt certification n aprova1 of processes and equip ment which are not s?ecifically designated hei-eiz ani! r:ii-i_ch are necessa.q- for th
10、e execution of this speciication, shall be selected. in accordance with FEEL-STD-143 3.2.2 ikight reduc-bion. minhum the equipnent * s operation or durability. reduction shall be su.3,je rr- cclntractor sha7U m without kpa2.rixg the tuiiction, A71 changes that are reqred to acconclish weight ct to a
11、ritter: s,p_r.ro-J.al by Yne yoculnicg azency prior to incorporation. n L . /- Y 8. .*LX . - -. /:. I . . -. . . -. . p . . l-zxrr: I . . . . . . . . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-, flIL-R-3895C LO = 9999906 0305559 5 “ . _-., . I .
12、 . % 1 :. ,. . . . . . . .-. . . . , . - . h. -. ,- ,- - . . . . . _“ “ . . . - -.-.- - -.-I ._. . ,._- ,. . Y.-.-. ,. - - _ . i- , t 1 . ,.-. . . . . . . . . . . . . . . . . . - -.-. .-.-.-l. _-_. t_.- . .-.-I.- _-. “. ._._-._-.-. - . -. “._ -.* . _.- . . . . . u . I . . ,. . , . . - . ._ -.- -.- -
13、 I . . . k:.-.-.x: F . _. . . . . . “ /$:.:.:.:z:z.-.r . . - *.- . - . . . . - . . . . . ._.-._ . L_ .- . ! p . . , . . + . e . _.- . . . . . . . .-.- . -I._- . _ .I I 1: z:z:j . t.-.-.-,- .-. ,.-.-i-.- e11-iz-38957 (USAF) 3.3 Design and construction. . . . . . . . . _.I._._I . “ . - -I.-.-. .-.- .
14、._- .-. -_-.-*.-_ . - .-. _ _- . * . ._.-_.- . . . “.I. . . ,. . C . . b. . . - .-. $ . . -. . e - , ,.: s . “ 3.3.1 The rack shall be constructed in conformance .to drawing 64J13000 and subsidiary drawings. :* 3.3.2 Interchangeability. id1 parb having the same number shall be directly and completel
15、y interchangeable with each other with respect to installation and performance. from aircraft to aircraft. listed .in i4IL-D-1000 shall apply aiid new drawings shall be prepared as required. The rack shall be completely interchangeable hen parts are not inerchangezble, the criteria 3.4 Performance.
16、stores by means of a cartridge-actuated mechanism which shall allow either a freefall drop or forced ejection of ali stores up to and including the 5000 pound class having 1h or 30 inch lug spacing and a diameter between 10.70 and 33 inches. The rack is designed for dive, hori_zontal, and other trie
17、 bombing. The rack shall be capable or suspending and releasing 3.4.1 velocity of store, reaction forces and the flight attitude of the store shall be controlled by orifices which are placed in the gas system and which meter the flow of gases to the ejection pistons. Forced Ejection. Mien forced eje
18、ction of the store is desired, the -23.4.2 Conventional weapor? arming control. The nose5 center, and tail solenoid operated arming controls shall operate ironi an 18 io 30 vdc power supply and shall each draw a maximum of 0.15 anCeres continuously when energized at 24 vdc. all standard zming wire l
19、oops. providing for an unarmed release or ejection, or amed release or ejection, of stores weighing from 100 pounds through .tne 5000 pund class. -. f: . . . -._ Each cor?trcl shall be c-able of receiving and holding . Zach control shall be selectively capable of 3.4.3 Life. The rack shall function
20、satisfactorily Tor 250 firings. 3.4.4 Reliability. The contrector shall initiate and maintain a reliability program in accordance with EIL-STD-78S. modification by %he procuring activity. This progran shall be subject to .3 .L.,!L. 1 achieved and demonstrated by the contractor: ReliabLiity levels. T
21、he following rellabilLty levels sliall be a. Inadvertent release. Wit11 ?roper adJiis-lment or“ the hook release mechanism, there shall be no inadvertent i-lease during the design service life of trie rack (250 firings under service condit5ons). 77- L b. Release perforname recgilrements. .x .-:;: :
22、:;:+.;:. ., * . . :.,. L (fiiiiiiiiiiiiiiiiiiici.:. , i.:. 1 . I : _. . .: . . . . . . . . . . . i _.-_ . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-3895C LO W 9779906 0305560 L W . -.-.-. . . . . . . . . . . . I:=:.:. . . * : ? . I - - .-
23、.- . . . -. . . -.-. .-_- -_._, -_ . .- . . . . I 7 Government furnished property. When specified in the contract, the Government will furnish the following to the contractor, upon his request, for use in testing the Rack, Bomb Ejector, Aircraft I.iAU-kO/A. Number Part :;umber of .Item Quantity It e
24、m Description . 1 P7877-1 Cartridge, Bomb As stcited in Ejection, HiIl 446-1 contract 2 10-3kOO Cartridge, Eomb As stated in Ejection, I23l 663-1 contract, !L . I /:.:y:. t“. . . I . -. I. . 1 - . .-.- -. -. 51 . ._ _. . . . 3 6731 400 Ca.rtridge, Bomb As stated. in contract n. cecti-c;n, CZIJ-I ,s
25、3.8 IJorhansh-ir,. dl1 ensure th!arts, such as i:zze;:lFtes, zs :dl as LO functional parts. - . .- . . . . . - . : . . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. ” . . I . .-. . _ . _- I . . . . . . . . . . . . . . I . i i. . . . -.-.- . . MIL
26、-R-38757C LO 777770b 03055bL 3 FiIL-R-38957C (SAF ) L . . . . ,. 4. QUALITY ASSURANCE - _ ._. .-._._.I-.- ._._-_ - . t- _._-_. . _-f.- .- - - . - . -.* . . -. . . . . ._ . ., . . - . . . . . . . . . . .-.- . - . . . I. .- -. ” . .:.:-: . *.- * “. . -.- _-._._-_- . . . . - . . -. b- .- *: . I. . 4. I
27、 or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. the supplier may utilize his om facilities or any commercial laboratory acceptable to the qualifying activity. perfom any of the inspections set forth in the specification where su
28、ch inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.2 Classification of tests. The inspection and testing of the rack shall be as follows: Responsibility for inspection. Unless otheriise specified in the contract Ekcept as otherwise specified, Th
29、e Government reserves the right to .- . _. _ .-. ” . . - p -_ t-: , . . -. . .i i . . -. . . . i . a. Qualification Tests . . , , . . . b. Acceptance Tests 4.3 Qualification testing. *Lk. 3.1 Testing. Qualification testing of preproduction rack (s) shall be performed by an independent laboratory acc
30、eptable to the activity responsible for the Qualified Products List (See paragraph 6.8). produced with manufacturing equipment and procedures normally used in production. Racks shall have been *4.3.2 Qualification test reports. Qualification daka shall be prepared and submitted for evaluation in acc
31、ordance with the requirements of the procuring activity. 44.3.3 Qualification .test requirements. rle sI;all be selected at random by the quality - froK each 2GO :,rocluci;iori racks. jected to the smplinz tests, the sm22-e racks shall have indiv5.clual tests. 4.4.2.2 Smplirg - tests. Sqt3ling teest
32、s sha- coiisist of shown in Table L. . 1.:. . ;.-.x:-:. 5 . ,. . - -, Prior to being sub- passed the the sanpling tests . 3 . ,. - . -,. i.-. . . -.-_-. .z . . . . I . :I:I: i . . . . . . . -.*.-. _.-I.- _. . . -.-_._- -.-._._ _-.,. ”_ .*. ”*.- -.- 1 -_-I. .- .-I- . -. 1 p . :-L:-7:-.- -.:, - :* -;
33、II ;.: (-p_i+; . . . . . l:i: . -. . . . , . . . . . .:.:I:I:; . . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- - I - MIL-R-38957C LO 9999906 0305562 5 .- -.- . . f Mn-R-38957C (WAF) t:.:?:.:.:; , . -. a.- -. . . - . . . . .:I: t . TmLE I . L ._.
34、 - . .- -. . . .- . - F . . , . . . . . . . . . . . . . . . . .- . _.-_ _._. - -. -. -.- -I-._ . . - . “ ._ . . . . . . _- - . . . . -_- . - , -.a . -.- E j.,: ._ i: . 1. * . _. L . L - . f.- . . I . - . .,-. . i . . . .-. . -. - . . L .- . . -I _-. F?:;:.:i: ._. -.I.- QUALIFI- INDI- REQLmb,miT TEST
35、 CATION VIDUAL SAKPLIMG TEST PAXAGilApH PARAGELAPH *TEST TEST TEST Examination c onforinance Static Load *Functional Sympathetic Reliability of Product to Drawings Tests Test Firing Test Life Test Environmental Tests High Temperature Test Humidity Test Salt Fog Test Icing Conditions Test Sand and Du
36、st Test Vibration Test Shock Test Electrical lests 3.3, 3.6, 3.8 3.3 . 3.8 - 3.3 3 94 3.4 3.4 3.5 3.5.a 3.5.b 3.5.c 3.S.d 3.S.e 3.5.f 3.5.g 3.h 4.7.1 4.7.2 4.703 4.7.4 4.7.5 k-7.6 4.7.7 4.7-7-1 .! 7.7 .2 4,797-3 4.7.7.4 4.7.7-5 4.7.7.6 4.7.7.7 b.7.6 X X X x X X X x v h II X h x X X X X x X X X X X X
37、 X h X TI- v 4.7.8.1 x 2. A %These tests mzy be performed concurrently wi.Gh the Fteliability Life Test in Qualification Testing Ll.k.3 Rejection and retest. 5hen the sample rack 2ils to meet the specified test, no rack or? hund or laker pro;. A.- . I . . . _-. . -. . . -. ., _-._ -.- .- -._- . . .-
38、._ , . r, I . . :. . . * . . . . . . . E:;: 1:- . _-. ._ . .-,- .-.-: _ _ -_.-_ . . . . - . _.- _ I_ . -. . F“ . (:I:. b . . I_ ti:-:-: . .-.-.-.-. . . _ . .-. . . “._._ . . . . . . . . .- . . . . . . . . . . - . . . . . . . . . . . . . )_._ -.- I. . . t.Z.X;:i -.-.- . -.-.-. . .-. .-.- . - . _- *.-
39、._. I . -.-_. . . 4.4.4 could indicate that defects may exist in items alreaa act-ted. If so, the- contractor shall Mly advise the procuring activity of all defects likely to be found and methods of correcting them. Defects in items already accepted. The investigation of a test failure . i . . .- .
40、-._- -.-_- ._. _._._.-. -,-.- . -_. . - - . . ._ . - .- . . ._I_ ._ . _. .- . - . L . , -,.y:-:z: -*-.- I- -.- k%:.-: ._._. .-. . ,. . ,. . . . I . . . , . r. . . . . . ;y:. conformance to the engineering drawings, subsidiary draTving.5 and -ecifications be cause for rejection. . . and standards ref
41、erenced therein. Failure to conform to these criteria shall i.-.- 4.7.3 Static load tests. NOTE: Tolerances for all loads applied. in tine static load tests shall be - + 3 ?er cent. *. . . :;:e: . . 4.7.3.1 Yield load tests. 4.7.3.1 .I Thirty-inch suspension c Provided by IHSNot for ResaleNo reprodu
42、ction or networking permitted without license from IHS-,-,-MIL-R-38957C (USAF) - . . . . . . - ,. . t . MIL-R-38957C LO 706 03055b4 7 .- t:.:-.-. . L . - . 1- . - I . . . -.I. . . -_-_- - . 2:”:z:I:n.-= . . . . . . _.-=.-.-_- t 4.7.3.1.1.2 Test procedure. the simultaneous imposition of loads for eac
43、h condition along or about, as applicable, the axes shown in Figure 1. first be imposed in increments of 10 per cent o deslgn load until 100 per cent of design load is reached, then in increments cf 5 per cent of design load until 115 per cent of design load is reached. per cent increment for three
44、minutes before proceeding to the next per cent increment after 60 per cent of the design load is attained. loading shall not exceed 5 per cent of the design loads per second. When a load of 115 per cent of design load has been reached and held for three minutes, the load shall be relieved to zero an
45、d the rack inspected. The simulated store shall be manually released and the position of the rack in the fMure shall be reversed. Test setup and procedures shall be repeated. permanent deformation shall be cause for rejection. shown in Table II. The yield load test of the rack shaU consist of For ea
46、ch condition the loads shall The loads shall be held at each The rate of Any Design loads shall be as _ I- . . :ll:.Y: . -. Fi:I: . :,: . . . . . . t: . -I- . -.* . _- _-.- -_* - . _ -_.- . f L- ._ .- ,-.-.-*.-.- . 1 . .-. .- . .-.-. . - . t.zz:z:-.- .- .- . 5 . I” - .-.-.- -. . F . .- . -.-.- - i TABU II DESIGN ums . . . .-.-. .-.- ._-_.-I -.-.- . _.- . - . - - . -. _.-._ . .- . _.- d-. . . +.-.-.- _ . .-.-.-I. . e.- -._. F . _ . . L - . . -. .-.- . ._
