1、MIL-8-b2LA bb W 7777706 OL2673q W MIL-B-8621A(Weps) . 15 August. 1961 SUPERSEDING MIL-13-8621 (Aer ) 20 July 1953 MLITARY SPECIFICATION BOARDS, CHART, MARK 6A, MARK 6B, AND MARK 6 4 This specification has been approved by the Bureau of Naval Weapons, Department of the Navy. 1. SCOPE 1.1 Scope - This
2、 specification covers design requirements and all performance requirements for the procurement of the Mark 6A, Mark 6B and Mm-k 6C chart boards. 1.2 Classification - The chart boards covered by this speci- fication shall be classified as follows: # Mrk 6A - Unlighted chart board, 3/4 inch in height.
3、 Mark 6B - Lighted chart board, 3/4 inch in height. Mark 6 - Lighted chart board, 1-1/4 inches in height, containing large envelope cards. 2. APPLICABLE DOCUMENTS 2.1 General - The folzowipg documents, of the issue in effect on the date of the invitation for bids, form a part of this Specification t
4、a the extent specified herein. # SPECIFICATIONS Federal NN-P-515 Plywood, Container Grade Q QQ-A -250 Aluminum Alloy Plate and Sheet; General Specification for Plating, Cadmium (Elect rodeposi ted) QQ*P-416 PPP-B - 5 66 Boxes, Folding, %perboard PPP-B- 401 Boxes, Wood, Cleated-Plywood 7. Provided by
5、 IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-B-b23A 66 H 9977906 0326935 T ML B-862lA(Weps) Military MIL-w -76 MIL-A-140 MIL- C - 5 5 41 MIL-E-5557 MIL-E-5558 MIL-L- 6363 MIL-s -6872 MIL-S-7742 1-8685 MIL-A -8625 MIL-8-70327 Military MIL- STD- 129 2 Wir
6、e and Cable, Hookup, Electrical, Insulated Adhesive, Water-Resistant, Waterproof Barrier-Material Chemical Films for Aluminum and Aluminum Alloys Enamel; Heat-Resisting, Glyceryl- Phthalate, Black EnSmel; Wrinkle-Finish, for Aircraft use Lamps, Incandescent, Aviation Service, General Requirements fo
7、r Soldering Process, General Spe ci f i cat i on for Screw Threads, Standard, Optimum Selected Series, General Specification for Primer Coating, Zinc Chromate, Low- Moisture-Sensitivity Anodic Coatings, for Aluminum and Aluminum Alloys Drawings, Engineering and Associated Lists M8rking for Shipment
8、and Storage Specifications and Standartis, Order of Precedence for the Selection of T+rnnp, Incandescent, T-1-3/4,Bulb, Midget Flange Base Metals, Definition of Dissimilar Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-z MIL-B-Bb21A 66 W 7777706 OL2
9、b736 L W MIL-13-8621 (Weps ) Naval Aircraft Factory 604555 Computer-Aircraft Navigational, krk 8-B 605190 Chart Plotting Board Mark 6A Aeronautical Instrument6 Laboratory E1410-0 Mark 6B and Mark 6c Lighted Chart Boards 2.2 Availability of documents - When requesting any of the applicable documents,
10、 refer to both title and number. Copies of this, specification and applicable documents my be obtained upon application to the Commanding Officer, Naval SuppJy Depot, Code EI, 5801 Tabor Avenue, Philadelphia, Pennsylvania 19120. 3. REQUIREMENTS 3 .I Preproduction - The chart boards furnished under t
11、his specification shall be products;*samples of which have been tested and have passed the preproduction tests specified herein. # 3 92 Selection of government documents - Specifications and standards for necessary commodities and services not specified herein shall be selected in accordance with MI
12、L-STD-143, except as provided in 3.2.1 and 3.2.2. 3.2.1 Commercial parts - Commercial parts having suitable properties shall be used, where on the date of invitations for bids, there are no suitable standard parts. screws, bolts, nuts, cotter pins, having suitable properties, may be used provided: I
13、n any case commercial.parts, such as (a) They can be replaced by the standard parts (MS or AN) without alteration. The corresponding standard part numbers are refer- enced in the parts list and, if practicable, on the (b) . contractor s drawings. 3.2.2 Standard parts - With the exception of 3.2.1, M
14、S and AN standard parts shall be used where they suit the purpose. identified on the drawings by their part numbers. They shall be 3 *3 hterials - Materials shall conform to applicable speci- Materials for which there are fications and shall be as specified herein. no applicable specifications, or w
15、hich are not specifically described herein, shall be of the best quality, of the lightest practicable weight, and suitable for the purpose intended, /- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- - MIL-B-b21A bb 99979Ob 012b937 3 m 393.1 Critica
16、l materials - Noncritical materials shall be used where practicable. Where the use of a critical material is essen- tialto meet specification requirements, the material used shall be the least critical of those which are adequate for the purpose. # 3.3.2 Nonmagnetic materials - Nonmagnetic materials
17、 shall be used for all parts of the chart board except where magnetic materials are essential. # 3.3.3 Metals - Metals shall be of the corrosion-resistant type, or shall be suitably protected as specified herein to resist corro- sion due to fuels, salt spray or atmospheric conditions to which the ch
18、art board may be subjected when in storage or during noml service life . 3.3 -3 -1. Dissimilar metals - Dissimilar metals as defined in hf33586 shall not be used in intimate contact with each other, unless suitably protected against electrolytic corrosion by means of protective coatings. 3.3.3.2 par
19、ts shall be covered with an anodic film conforming to Specification 1-8625. alloys which do not anodize satisfactorily shall be coated with a chemical film in accordance with Specification MIL-C-$541. Aluminum alloy .parts - Where practicable, aluminum alloy Small holes and case inserts need not be
20、anodized. Aluminum 3.3.3.3 Iron and steel parts - Iron and steel parts shall be cadmium plated in accordance with Specification QQ-P-416. 3.3.4 Protective treatment - When materials are used in the construction of the chart boards that are subject to atmospheric or environmental conditions likely to
21、 cause corrosion in normal service life, they shall be protected against corrosion in a manner that will in no way prevent compliance with the performance requirements of this specification. Finishes and protective coatings which will crack, chip or scale during normal service life or are affected b
22、y extremes of atmospheric or environ- mental conditions, shall not be used. # 3-3.5 Fungus-proof materials - Materials which are nutrients for fungi shall not be used where it is practicable to avoid them. used, they shall be treated with 8 fungicidal agent acceptable to the procuring activity. Wher
23、e # 3.3.6 Fumes and vapors - aterials used,.in the construction of the chart boards shall not produce corrosive, deleterious, or toxic fumes or vapors under the conditions specified herein. # 3 =4 the scale on one edge shall be marked with numerals as shown on AIL Drawing E1410-0 and the unmarked ed
24、ge shall have a lusterless finish. 3.4.4.5 Both edges of the ruler shall be graduated every i/8 3.4.4.6 Pencil sharpener - Each Mark 6B and Mark 6C chart board shall be equipped with a commercially available pencil sharpener perma- nently attached to the metal tray in such a manner that access to th
25、e sharpener shall be through the front edge of the chart board. 3.4.4.7 Spare lamps - Each Mark 6B and Mark 6 chart board shall be supplied with twospare lamps which shall be held by clips permanently attached to the. metal tray. rts - In addition to the file cards installed C chart board, there sha
26、ll be a spare set of =5- 3.4.4.8 in each Mark 6B and Wrk five file cards packaged with each Mark 6B and Mark 6 chart board. The rk 6C chart board sbll also have five additional large envelope cards included in each package. 3.4-5 Chart board fasteners - Each Mrk 6B and hrk 6C chart board shall be eq
27、uipped with four fasteners for attaching the chart board to its mount in the aircraft. The location and type of fastener shall be in accordance with AIL Drawing E1410-0. 3.4.6 be as follows: Weight - The maximum weight of each chart board shall # Mark 6A 2.8 pounds. Mark 6B 3.5 pounds. Mark 6 4.0 po
28、unds. 3.4.7 Screw threads - Screw threads 0.060 inch in diameter or larger, shall be in accordance with Specification MIL-S-7742, # 3 -5 Electrical requirements - 3.5.1 Lighting system - The lighting system for the brk 6B and Mark 6C chart boards shall be designed to operate on 28 +lVolts direct cur
29、rent and on the principle of edge lighting to illuminate the plotting area using one lamp centrally,located. be constructed so that the lamp may be easily removed and replaced with- out the use of tools. The light assembly shall 3.5.1.1 Illumination - The lighting system for the lighted chart boards
30、 shall provide sufficient illumination of the lighted surface to produce a minimum brightness of 100 micro-lamberts when the lamp is operated at 28 volts. The lamp shall conform to MS25237-327 and shall be red-coated in accordance with the Type II requirements of Specification 1-6361- - 8 Provided b
31、y IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.5.1.2 Intensity control - The lighting system for the lighted chart boards shall contain a combination on-off switch and wire wound rheostat to control the intensity of the light from zero to maximm brightness.
32、 3.5.1-3 Electric connector - The electric connector for the lighted chart boards shall be in accordance with AIL Drawing E1410-0. 3.5.1.4 Wiring - The wiring used in the opposite 10 on min scale, read 10 on mile scale Set 10,000 ft. pressure altitude opposite 0C; opposite 315 CAS, read 370 on true
33、A S. scale Set 40,000 ft pressure altitude opposite -6o“c; opposite 200 CAS, read 400 on true A.S. scale Density altitude computations Set O ft pressure altitude opposite +i$ OC; opposite density altitude scale index, read O ft Set 17,000 ft pressure altitude opposite -10C; opposite index, read 18,0
34、00 ft on density altitude scale Set 40,000 ft pressure altitude opposite -40C; opposite index, read 41,393 ft on density altitude scale Calibrated altitude computations Set 15C opposite O ft pressure altitude; opposite 10 on min scale, read 10 on mile scale Set 40C opposite O ft pressure altitude; o
35、pposite calibrated alt 4,600 ft, read 5,000 on correct altitude scale Set -40C opposite index for pressure altitude; opposite calibrated alt 40,000, read 42,750 on corrected altitude scale - hbximum - 10.05 371 85 402.00 - +5 18,100 41,600 - 10.05 5 9 025 42,964 Minimum 9.95 368.15 398.00 -5 17,900
36、41, i86 9.95 4,975 42,536 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-B-BbZLA bb 7777706 OL2b7Li 8 MIL-B-8621 (Weps ) 4 *7 Rejection and retest - Chart boards which have been reelected may be reworhd or have parts replaced to correct the defe
37、cts and may be resubmitted for acceptance. particulars concerning previous rejection and action taken to correct the defects shall be furnished the Government inspector. Before resubmitting, full 5. PWARATION FOR DELIVERY 5 Packaging - 5.1.1 Unit packaging - A unit package shall consist of one chart
38、 board and spare parts enclosed in a carton conforming to Specifi- cation PPP-B-566. The chart boards shall be centered in the carton and supported with die-cut fiberboard pads in such a manner that the edge of the disk or any projections cannot contact the sides of the carton. the carton is resting
39、 on any of its faces, the pads shall support the sides of the chart board in such a manner that the weight of the chart board will not be borne by the edge of the grid disk or any projection. When 5.1.2 Intermediate packaging Unless otherwise specified, 25 unit packages shall be packed in a cornigat
40、ed or solid fiberboard box. 5 -2 Packin5 - Unless otherwise specified, all items shall receive domestic packing. number of intermediate packages, shall be uniform in size and snugly packed. not exceed 200 pounds. Shipping containers shall contain the same The gross weight of the fully packed exterio
41、r container shall 5.2.1 . Domestic packing - Intermediate packages shall be over- packed in substantial commercial exterior containers constructed to insure acceptance by common or other carrier for safe transportation at the lowest rate to the point of delivery. storage, rehandling and reshipment w
42、ithout the necessity of repacking. Overseas packing - Unless otherwise specified by the procuring activity, intermediate packages shall be packed in Ailed wood or cleated plywood boxes conforming to Specification PPP-B-601. Plywood, if used, shall be in accordance with Specification NN-P-515, Type A
43、 or B, Condition I. All boxes shall be furnished with a waterproof ca8e liner with adhesive conforming to Specification MIL-A-140. Containeh shall be able to withstand 5.2.2 5 03 Marking and labeling - Each unit and intermediate pck- age and exterior shipping container shall be marked as specified i
44、n MIL-STD-129, including. the following nomenclature: U. S. PROPERTY CHART BOARD, MARK 6A (or 6B or 6c, as applicable) SPEC IFICATION - 15 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-5.3.1 Precautionary marking - The following markings shall appe
45、ar on two opposite sides of each unit psckage, intermediate package, and exterior shipping container: FRAGILE DELICATE INSTRUMEmTS HANDLE WITH CARE 6.1 Intended use - The chart boards covered by this speci- fication are intended for use by flight personnel in solving aerial navgation problems and as
46、 a convenient place for stowing affiliated equipment. 6.2 Ordering data - Procurement documents should specify the following: Title, Number and Date of this Specification b The quantity and hrk number of chart boards desired. (c) Types of packaging and packing desired (See Section 5). 6.3 Drawing re
47、quirements - The attention of contractors is invited to the fact that Government contracts for equipment, whether procured directly by the Government or through another contractor, require that all drawings submitted must be in accordance with the requirements of Specification MIL-D-70327. 6.4 Prepr
48、oduction test provisions - The manufacture of cbert boards on contract shall not commence until the samples submitted are pronounced satisfactory by the procuring activity. is in continuous production of the chart boards from contract to contract, the submission of further preproduction samples on t
49、he subsequent contracts may be waived at the discretion of the procuring activity. preproduction samples or the waiving of preproduction tests does not pre- clude the requirement of acceptance testing. When 8 contractor Approval of 6.4.1 It shall be understood that the chart boards supplied under contract or order shall be identical to the corresponding preproduc- tion sample in design, construction, quality, mate
