NAVY MIL-C-27298 B-1980 CLOCK AIRCRAFT MECHANICAL ABU《ABU机械飞机速度计》.pdf

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1、Fed er al DD-G-4 5 1 Glass, Flat and Corrugated, for Glazing, Mirrors, and other uses QQ-C-320 QQ-N-290 QQ-P-416 QQ-2-325 Chromium Plating (Electrodeposited) Nickel Plating (Electrodeposited) Plating , Cadmium (Electrodeposited) Zinc Coating, Electrodeposited, Requirements for Beneficial comments (r

2、ecommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commanding Officer, Naval Air Engineering Center, ESSD, Lakehurst, New Jersey 08733 by using the self-addressed Standard Document Improvement Proposal (DD Form 1426) ap

3、pearing at the end of this document or by letter. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ -. - - I_ _- -_ - MIL-C-272TB bb M-777770b 0135Ob3 2 W MIL-C- 27 298B (AS) SPECIFICATIONS (Continued) Military MIL-P- 11 6 MIL-M-317 1 MIL-L- 3 9 18 M

4、IL-E-5272 MIL-(2-554 1 MIL-R- 68 55 MIL-S-6872 MIL-S-7 74 2 MIL-A-8625 MIL-N-18307 MIL-P- 23408 MIL-L- 25467 MIL-D- 1000 STANDARDS Fed er a 1 FED-STD-595 Military MIL-STD-130 MIL-STD- 143 Preservation-packaging, Methods of Magnesium Alloy, Process for Corrosion Protection of Lubricating Oil, Instrum

5、ent, Jewel Bearing Environmental Testing, Aeronautical and Associated Equipment, General Specification for Chemical Films for Aluminum and Aluminum Alloys Rubber; Synthetic, Sheet, Molded, and Extruded, for Aircraft Applications Soldering Process, General Specification for Screw Threads, Standard, O

6、ptimum Selected Series, General Specification for Anodic Coatings , for Aluminum and Aluminum Alloys Nomenclature and Nameplates for Aeronautical Electronic and Associated Equipment Plating: Tin-Cadmium (Electrodeposited) Lighting, Integral, Aircraft Instrument, General Specification for Drawings, E

7、ngineering and Associated Lists Colors Identification Marking of U.S. Military Property Specifications and Standards, Order of Precedence or the Selection of 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-2729B 66 = 9977706 0135064 Li m MIL-

8、C- 2 7 2 98B (AS) STANDARDS (Continued) Military (Continued) MIL-STD-794 Parts and Equipment, Aeronautical, Preparation for Delivery MIL-STD-889 Dissimilar Metals MS3137 Connectors, Plug, Electric, Solder Type, Short, . Push-Pull Coupling MS 243 67 Lamp, Incandescent - Miniature Integral Lighting MS

9、24515 Lamp - Sub Miniature MS 28 105 Window, Dial - Aircraft Instrument Cover, Glass MS33558 Numerals and Letters, Aircraft Instrument Dial, Standard Form of (Copies of specifications, standards, drawings, and publications required by contractors in connection with specific procurement functions sho

10、uld be obtained from the procuring activity or as directed by the contracting officer.) 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), the contractor shall furnish sample units for first article inspection and approval (see 4.3.1 and 6.2). 3.2 . Selection of Government documents. Excep

11、t as provided in 3.2.1 and 3.2.2, specifications and standards for necessary commodities and services not specified herein shall be selected in accordance with MIL-STD- 143. 3.2.1 Commercial parts. Commercial parts having suitable properties shall be used, when on the date of invitations for bids, t

12、here are no suitable standard parts. In any case, commercial parts, such as screws, bolts, nuts, cotter pins, having suitable properties, may be used provided: a. They can be replaced by the standard parts (MS or AN) without alteration. b. The corresponding standard part numbers are referenced in th

13、e parts list and if practicable, on the contractors drawings. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- - MIL-C-2727B bb 77997Ob Ol35b5 b i MIL-C- 2 7 2 98B (AS) 3.2.2 Standard parts. With the exception of 3.2.1, MS and They shall AN standar

14、d parts shall be used where they suit the purpose. be identified on the drawings by their part numbers. 3.3 Materials, Materials shall conform to applicable specifications and shall be as specified herein, Materials for which there are no applicable sp,ecifications, or which are not specifically des

15、cribed herein, shall be of the best quality, of the lightest practicable weight, and suitable for the purpose intended. 3.3.1 Critical materials. Noncritical materials shall be used where practicable. to meet specification requirements, the material used shall be the least critical of those which ar

16、e adequate for the purpose. Where the use of a critical material is essential 3.3.2 Nonmagnetic materials. Nonmagnetic materials shall be used for all parts of the clock except where magnetic materials are essential. 3.3.3 Metals. Metals shall be of the corrosion resistant type, or shall be suitably

17、 protected as specified herein to resist corrosion due to fuels, salt spray, or atmospheric conditions to which the clock may be subjected when in storage or during normal service life. 3.3.3.1 Dissimilar metals. Dissimilar metals as defined in MIL-STD-889 shall not be used in intimate contact with

18、each other, unless protection against electrolytic corrosion is provided. 3.3.3.2 Magnesium alloy parts. Magnesium alloy parts shall be created in accordance with Specification MIL-M-3171. resistance is a factor, an anodic treatment approved by the procuring activity shall be used. When abrasion 3.3

19、.3.3 Aluminum alloy parts. Unless otherwise specified, aluminum alloy parts shall be covered with an anodic film conforming to Specification MIL-A-8625, Small holes, pipe threads, and case inserts need not be anodized. shall be coated with a chemical film in accordance with Specification MIL- C- 554

20、 1 Aluminum alloys which do not anodize satisfactorily 3.3.3.4 Iron and steel parts. Iron and steel parts which are in hermetically sealed cases shall be cadmium plated in accordance be chromium, nickel, or zinc plated in accordance with Specifications QQ-C-320, QQ-N-290, or QQ-2-325 respectively. P

21、arts in a confined space in the presence of organic material shall be tin-cadmium plated in accordance with Specification.MIL-P-23408. shall meet the requirements of 3.3.4, ,with Specification QQ-P-416. Parts which are not in sealed cases shall The class and type of plating 4 Provided by IHSNot for

22、ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-27 298B (AS) 3.3.4 Protective treatment. When materials are used in the construction of the clock that are subject to atmospheric or environmental conditions likely to cause corrosion in normal service life, they shall

23、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 by extremes of atmospheric or environmental conditio

24、ns, 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. Where used, they shall be treated with a fungicidal agent acceptable to the procuring activity. If the materials are used in a hermetically sealed enc

25、losure, fungicidal treatment willnot be necessary. 3.3.6 Fumes and vapors. Materials used in the construction of the clock shall not produce corrosion, deleterious, or toxic fumes or vapors under the conditions specified herein. 3.4 Design and construction. The clock shall be so constructed that no

26、parts will work loose in service and so that it will withstand the normal- shocks, vibrations, and such other conditions as are incident to service without failure, shipping, storage, and installation. 3.4.1 Maintenance. The design shall be such as to facilitate as much as possible disassembly, repa

27、ir or overhaul, service maintenance, and reassembly using those tools and items of maintenance equipment which are normally available as commercial standards. 3.4.2 Case. The case shall conform to Figure 1. The case and mounting flange shall be made of nonferrous metal, uniform in texture, having a

28、smooth surface, and shall be rain and dust tight. The case shall be finished with a lusterless black material, Color No. 37038 of FED-STD-595. The finishing material shall be of a durable type to withstand usage encountered in service. 3.4.3 Weight. The weight of the completely assembled clock shall

29、 not exceed one pound. 3.4.4 Screw threads, Screw threads 0.060 inch in diameter or larger shall be in accordance with Specification MIL-S-7742. 3.4.5 Clock controls: 3.4.5.1 Winding and setting knob. The winding and setting knob, located in the lower left hand corner of the clock case, shall wind t

30、he mainspring of the clock when turbed in a clockwise direction 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- I_ - - - MIL-C-2729B bb m 999770b 0335067 T m .170k.OO2-2 HOLES - KNOBS NOT SHOWN IN THIS VIEW FOR CLARITY MIL-C-27 2 98B (AS) 19/3 AX

31、,047 R - 2- 3/8- r NAMEPLATE =)?MAX 1 I I- 3/4 MAX y A 1/2MAX I h4- RECEPTACLE (LOCATION OPTIONAL) REGULATOR PLUG (LOCATION OPTIONAL) DIMENSIONS IN INCHES, UNLESS OTHERWISE SPECIFIED. TOLERANCES DECIMALS k .O05 - FRACTIONS f I /64. *. OPTIONAL 1 FIGURE 1. Clock Case and Knobs 6 Provided by IHSNot fo

32、r ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C- 2 7 298B (AS) and shall engage the setting gear for the hour and minute hands of the O clock when pulled out into the setting position. The knob shall be free to turn counterclockwise with a ratchet gear. The winding

33、 and setting knob shall not require a force of more than 3 pounds to pull it into the setting position. 3.4.5.2 Elapsed time knob. The elapsed time knob, located in the upper right hand corner of the clock case, shall start and stop the elapsed time function of the clock at will to take “time-out“ (

34、up to 60 minutes and repearing). Three pushes of the knob shall complete the elapsed time functions, causing the elapsed time and sweep second hands to start, stop or fly-back. The Ely-back position of the sweep second hand and the elapsed time hand shall be “60“ as indicated on the dial. The elapse

35、d time function shall not interfere with the hour and minute time hand s. 3.4.6 Balance wheel and hairspring unit. The balance wheel and hairspring unit shall be temperature compensated metal. The balance wheel shall be fitted with not less than 12 screws, at least 4 of which shall be regulating scr

36、ews. 3.4.6.1 Balance staff. The balance staff shall be readily removable and replaceable without disturbing the poise of the balance wheel. 3.4.6.2 Hairspring. The hairspring shall be of the Brequet type and shall be constructed from corrosion-resisting metal. 3.4.7 Level regulator. A lever regulato

37、r to adjust the clock time rate shall be accessible from the regulator opening on the case and shall be centered on the regulator scale, within 10 percent of either the “fast“ or “slow“ scale range. 3.4.8 Movement. The clock shall have an 8-day movement with not less than 15 jewels located at bearin

38、g points most essential to reduce friction of train, escapement, and totalizing mechanism parts. 3.4.9 Lubrication. The clock shall be sufficiently lubricated for at least 2 years operation. The lubricant shall conform to Specification MIL-L-3918 and shall be of such quality that satisfactory lubric

39、ation will be provided when the clock is run at temperatures. of +55O to -35OC. I 3.5 Electrical requirements 3.5.1 Integral lighting. The clock shall be integrally red lighted in accordance with Specification MIL-L-25467. design shall employ a wedge for light transmission and distribution. The wedg

40、e shall not rotate in the bezel after assembly. The lighting 7 # . * Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-r- 3/32 EQUILATERAL TRIANGLE 5/64 C

41、HARACTERS 12 EQUAL SPACES .O10 LINE WIDTH 60 EQUAL SPACES 1/16 DIA 8 DOTS COLOR OF NUMBERS GRADUATIONS TO BE IN ACCORDANCE WITH FED STD 595. COLOR WHITE NO, 37875 ,020 LINE -t45 I / I6 CHARACTERS .O10 LINE WIDTH COLOR IN ACCORDANCE WITH FED STD 595 COLOR BLACK NO. 37038 DIAL THICKNESS .O28 p-l-7/8 D

42、IA ENLARGED VIEW WIDTH 48 LINES 1/16 i -r 1/16 5/32 CHARACTERS .O31 LINE WIDTH DIMENSIONS IN INCHES. UNLESS OTHERWISE SPECIFIED, TOLERANCES: DECIMALS .O10 - FRACTIONS 2 1/64. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-27298B (AS) COLORS IN

43、 ACCORDANCE WITH FED-STD-595 7 r:250+ .O30 I 1.875 DIA - I SWEEP SECOND HAND ELAPSED TIME HAND COLOR WHITE - MINUTE HAND HOUR HAND COLOR BLACK NO. 37875 NO. 37038 DIAL F A F.O94 COLOR WHITE NO. 37875 .O94 R DIAL AND HAND ARRANGEMENT ENLARGED VIEW COLOR BLACK No. 37038 -3s COLOR BLACK NO. 37038 4 .I5

44、6 DIA b - - .626 .O30 * ,093 COLOR WHITE NO. 37875 COLOR BLACK NO. 37038 DIMENSIONS IN INCHES. UNLESS OTHERWISE SPECIFIED, TOLERANCES: DECIMALS 2 .O10 FIGURE 3, ABU-9/A Clock Hands 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot

45、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-B-27298B (AS) 3.9*4.2 Low temperature exposure. The rate of the clock for 6 hours shall not vary from the starting error by more than 15 seconds. 3.9.4.3 Humidity exposure, The rate of the clock for 6 hours shall not

46、 vary from the starting error by more than 20 seconds. 3.9.4.4 Shock exposure. The rate of the clock for 6 hours shall not vary from the starting error by more than 20 seconds. 3.9.4.5 Vibration endurance. The rate of the clock for 6 hours shall not vary rom the starting error by more than 20 second

47、s. 3.9.4.6 Operation in a magnetic field. When the clock is subjected to high and low field strengths as specified under 4.6.13 and operated for 6 hours after each subjection, the clock rates shall not differ by more than 15 seconds, 3e10 Run down time. After being fully wound the clock shall operat

48、e for 8 days (192 hours) minimum before stoppingr 3.11 Identification of product. 3.11.1 Nameplate. A nameplate conforming to Specification MLL-N-18307, shall be securely attached to the exterior of the case and shall be marked in accordance with the requirement of MIL-STD-130 except that the FSN sh

49、all be omitted, 3.11.2 Manufacturers part number. The manufacturers part number on the nameplate shall be identical with the manufacturers engineering production drawing number including applicable dash numbers if the drawing is tabulated and covers more than one part. 3.12 Interchangeability. All parts having the same manufacturer