1、CONE=, AUI NAVIGATIUIU, %iIJGhT !WE Ad This limited coordination military specification has been prepared by the .; be used in procurement 1. ScGr% designated as T37pe Ad. 1.1 This specification covers one type of handheld, twilight computer, 2. UIWWrn DCCrnSIflS 2.1 The following documents, of the
2、issue in effect on the date of invitation for bids, form a part of this specification to the extent specified herein: Federal GV-351 Vinyl Chbrida Polymer and Copolymer Rigid Sheets Military MIGsID-13Q -u3 Ibnfification Marking of U.S. Military Speeifieatione ma Steadasde, Order of Property Preoeden
3、oe for the Seleofion ( i4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-OL37B bb m 77777Ob OL26b51 7 (Copies of documents required by contractors in connection with specific procurement functions ahouid be obtained fzran %he proowing aatwlty
4、or 88 directed by the contracting officer.) 202 Other Fublica.tions.- The following document forms a part of WS specificat;ion. niess otherwise indicabd, the Sssw in effect on date of invitation for bids shall crppvt The American Air Umanac (Copies of The American Air Blnanac may be obtained qon app
5、lication to the ydi;ugrapNc Office, Deaprtment of the Navy, Suitland, BIIarylande) 3.1 Pre?roduction.- This specification makes provisions for preproduction testing. 3.2 Sdection of Specifications and St;rndards.- Specifications and standards for necessw commodities and services not specified herein
6、 shall be selected accord- to 3.2020 MESTD-ILc3 except as provided in 3.2.1 and - 3.2.1 Cornniercial artse- Commercial parts having suitable properties 1 be wu where, on lhe date of invitation for bids, there are no suitable standard parts. in any case, comercial utility parts having suitable proper
7、ties m- be used provided: a. They c8n be replaced by the standard parts (IS or AN) without alteration . bo The. correspondin$ standard part numbers are referenced in the parts list and, if practical, on the contractors drawings. 3.2.2 Standard Pmts.- With the exception in 3.2.1, MS and AN standard p
8、arts shall. be used where thy suit the purpose. They shall be identified op the rawings by their part nunkers. resin in accorciance with Specification L-V-3Sl. homogeneous, flat, and resistive to water ard warpage. of the Type A-1 Computer that are subject to.corrosion in salt air or other atmospher
9、ic conditions likely,to occur during service usage, they shall be protected at.rrnts of this specification. of cric) protective coating that will crack, chip,or scale with age or extremerr of atmospheric conditions shall be avoided. 2 3.3 MafieriJ.s.- The Type All computer shall be constructed from
10、vinyl The material shall be 3.3.1. Protective Trea-nt .= When materials am used in the construction The use Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-OOL39B 66 = 9999906 OL26b52 7 W 3.4 Design and Construction.- The Type A4 cmputer shall
11、conform substantially to figure 1. The computer shall be composed of a base pkb, a rotatable disc, and a sliding arm or runner. !Che rotatable disc and sliding 81i11 shall be so mounted on the base plate that the disc my be rotated about a perpendicular ds and the runner my be slid across the face o
12、f the rotatable disc. HA itadex wk. A line drawn through either 25 declination mark, parallel to the 0 declination mark and center of the disc, shau be tangent to tfie 6y htitude circle on the rotatable disc. The base plate shall contain a GHA index mark, a The base plate shall als0 contain 30b.1.2
13、24-Hour Scale.- The 24-hur scale shall be located around $he 364.103 Declination Scale.- The declination scale shall be so located 3.4.2 Rotatable Disc.- lhe rotatable disc shall be constructed from china white vinyl copolynier plastic. polar gnomonic projection map, latitude circles, meridians of l
14、ongitude, and a GHA scale. eyelet 3.4.2.1 Projection Map.- The projection map ,shall cover the region from 60. to mo north latitude. All prominent land masses in the north polar area above 60 north latitude shall be shown and shall.be tinted .a light yeUow color. Landmarks and cities shalL be marked
15、 and nwd. The rotatable disc shall contain a The rotatable disc shall be attached to the base plate by an 3.4.2.2 Utitude Ci+Les.= The rotatable disc ,shall contab concentric c5rcles representing parallels of latitude in l-degree increments between 60 and 88 north latitudes. Unes representbg mridibs
16、 of longitude in $degree increrrsnts between 60 and 8l; north latitude and in 15idegree increments between 85 and 88. north latitiide. 3.4.203 Longitude Lines.- The rotatable disc shaU contain radiating Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,
17、-MIL-C-0081398 66 7777706 0126653 O = 4 ., , I n r -I I I I 7 9 .So T 1 2.250 I i$ - 0062 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-OOL39B bh W 9999906 012665q 2 - -. . 3.4.3 Sliding-Arm.- Tfie slid5hg am or mer shall conform to figure
18、2 and shall be constructed from transparent vinyl plastic. 3.43.1 Crosspiece.- A crosspiece at one end of the slid* / / / n, I 39% 99s rld 8S“ S? ddd EIE e ddd Ros ? $? ddd Ei- . . 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-BL37B 66 7777
19、7b OL2bb5b b I I I 1 I 1 I I I I 1 1 I I I I I I I I I I I I I I I l l I I I I d Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.7 .Finish.- All edges of the corcp?u%r shall be bdfed. Surfaces of 3.0 Markings 3.8.10peration Piarkings.- AU markings
20、and figures shall be sharply defined and legible. Except as otherwise specified herein, all markings shall be black. All markhgs shall be covered with a transparent thin lamination of v-1 copolymr plastic in accordarice with Specification LV-351, or other suitable material, approximately O.oO3-inch
21、thick the base pkte and rotatable disc shall have a satin matw finish. of the slidiq arm shall have a highly polished finish. Surfaces 3.8.2 Scale I.;arkiryu.- All the scales shall be marked by the silk screen process, or equal. radial line every 15 starting at the GHA line, and numbered consecutive
22、ly in a counterclockwise direction starting with number 1 at 345. The numbers shall be 1/8-inch high and in a horizontal plane as are the numbers on the face of a clock. Iimbers shall not be printed at 90 and 360 because of space limitation. 3.8.2.1 24-Hour Scale.- The 2bhour scale shall consist of
23、a 5/32-inch 3.8.2.2 Declination Scale.- The declination values shall be rarked in 1-degree increments from 29 aouth to 2F north. numbered in 5-degree increments. 3.8.2.2.1 South declinations shall be located above the O* declination mark and shall be indiceied by a black letter IlSn adjacent to the
24、uppermost numeral 25. The marldngs shall be 3.8.20202 North declinations shall be located Lelow the 0. declination mark and sha be indicated by a black letter W adjacent to the lowermost numeral 25. . 3*8.2.3 ihe declfnation markings shall be placed at distances equal to the radii of circxes represe
25、nting parallels of latitude equal to 90 minus declination; e.g., the 5 declination marks are located a distance, above and elow the O declination mark, equal to the radius of the 89 20W, 160E, and ?OWE. 3.8.3.2 Longitude Unes.- The meridians of longitude shall be nunbered everj 10 east and Wst, star
26、ting with the Greenwich or O meridian, outside of the 60 latitude circle, and shall be numbered every 60 rast and rest between the 86 and 87 latitude circles. East longitudes sWl increase in a counterclockwise direction from O to UO, and west longitude shall increase in a clochise direction fron O t
27、o 180. 3.8.4 Sliding Arm.- The sliding arm shall be marked as specified on figure 2. AU markings shall be on the underside of the runner- 3.8.4.1 Crosspiece Scale.- The crosspiece scale shall have graduations 3.8.5 Operating Instructions.- The following instructions shall be for O-, l,oOO-, 3P),-, a
28、nd 50,000-foot altitudes and a SuuriseSunset line. printed on the rear side of the cornputer base plate. ao Plot on rotating disk position for which time of sunrise, sunset, beginning of morning twilight, or end of evening twilight is required. bo Ekom the American Air Almanac, extract the average d
29、eclination of the sun for the ci* concerned. Place the height ofthe aircraft opposite the average declination. 8. Rotate disk until plotted position is. under appropriate line on runner. a. Read GiA of required time opposite index. 0. Using the American Air Almanac, convert GHA to the required time.
30、 f. For use in south polar regions, used declination scale in red.“ 3.9 Weight.- “he weight of the Qpe A-1 computer, without caw, shal not exceed 1 pound. 9. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-oO8139B (USAF) be marked for identific
31、ation in accordance with Stad . MIL-C-OO137B bb 779770b O12bbb0 5, . 403.2.2 Sampling Plan BO- ne computer shall be selected at random from every 2s r fraution thereof manufactured on the production run and subjected to the folowing tests: TESTS Centering Accuracr Test Scale Accuracy Tests 4.3.26 Re
32、jection d Retest.- When one equipment selected from a production run f$ls to meet this specific-ation, no equipments still on hand or later produced SU be accepted until the ex.tent and cause of failure are determined. ., 4.3.2.3. 1ndivid21. Tests ig Continuei- iior operational reasons, - individual
33、 tests may be continued pending the investigation of a sanpling test failure, But finel acceptance of equipmnts on hand or produced later shall, not be made until it is determined that equipments met aU the requirements of this specification. test failure could indicate that defects may exist in equ
34、ipments already accepted. if so, the contrzctor shall fw- advise the procuring activity .of ail defects likely to be found and methods of correcting them. .L Test Conditions,- unless otherwise specifie.d, %he tests sha be -conducted under ambient atmospheric conditions. 4.3.3 Defects in Equipments A
35、lready Accepted.- The investigation of a . ,-. 4.5 Test Methods hS.1 Exanination of Product,- The computer shall be vise inspected 3- . - to veri* that the materials, design and construction, necessary iriechanid measurements, marking, and workmanship comp3y with the requirensnts of this specificati
36、on. h.5.2 Centering, Accuraw Tests 4.Se2.1 The rotatable disc shall be so placed that the O mark is aligned with %he GU index. Opposite 6, E?-, and 18-hour marks, read 270, 180, and 90 20.5“ , respectively. k.5.2.2 Repeat 4.05.2.1 by successive placing of YO, 180, and 270 marks opposite GU index and
37、 reading degrees opposite 6-, 12-, and 18-hour marks. Ninety-degree nultiples shall be read within k0,9. 405.3 Scale Accuray Tests.- The accuracy of the scales shall be tested by setting indicated answers shall be read within Il.0. and solving the following problems on the computer. The Provided by
38、IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-OOL37B 66 7777906 OL2bbbL T 1 a 3 4 5 6 7 8 9 10 11 Lat 60000“ 64000“ 710 00 IN 720 00 IN - 8O0001N 68001N 8200 IN 8000“ 6y0001 6700N 6000 Pi C onti t ion Sunset Sunrise Begining of Twiight Begining of Mlight
39、 Sunrise End of Twilight Sunset Sunset Beginjng of Twiiight Sunrise Bnd of Twilight Altitude O 10,000 30,000 0 and the fact that the. Covernment niay havc formulated, furnished, or in any way supplied the said drawings, specifications, or other data is not to be regarded by implication or otherwise
40、as in any ntanner licensing the holder or any other person or corporation, or conveyingany rights or permission to rmnufacture, use, or sell any patented invention that may in any way be related thereto. c. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
