1、O 25 June 1980 MI L - I - 23832 (AS I 19 March 1972 MILITARY SPECIFICATION INDICATOR, TACHOMETER, TRIPLE POINTER, HELICOPTER This specification is approved for use by the Naval Air Systems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Department of
2、Defense. 1.1 Scope. This specification covers design and all .-? performance requirements for helicopter triple pointer tachometer indicators. 1.2 Classification. The indicators shall be of the - following types: 100 percent RPM Indicated Engine 1 Engine 2 Engine 3 MS18099-1 Unlighted 4200 4200 4200
3、 MS18099-2 Lighted 4200 4200 4200 MS18099-3 Unlighted 3794 3794 3900 MS.1809 9-4 Unlighted 3900 2. APPLICABLE DOCIJMENTS 3900 2640 2.1 The following documents of the issue in effect on date of invitation for bfds or request for proposal, form a part of this specification to the extent specified here
4、in. SPECIFICATIONS Federal i BB-N-4 1 1 - QQ-C- 3 2 O QQ-N- 2 9 O Nitrogen Chromium Plating (Electrodeposited) Nickel Plating (Electrodeposfted) QQ-Z-3 25 Zinc Plating, Electrodeposited , Requirements for Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be
5、 of use in improving this document should be addressed to: , Commanding Officer, Naval Air Engineering Center, ESSD, Lakehurst, NJ 08733, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document, Provided by IHSNot for ResaleNo re
6、production or networking permitted without license from IHS-,-,-MIL-I-Z3832A bb 77997Ob 0332280 b MIL-I- 23832A( AS) SPECIFICATIONS (Continued) Mi 1 it ar y MIL-P- 11 6 MIL-M- 3 1 7 1 MIL-E-52 7 2 MIL-C-554 1 MIL-S-6872 MI L-S - 7 7 4 2 MIL-A- 86 25 MIL-G-93 98 MIL- C- 14 8 O 6 MIL-C-254 67 MIL-C-26
7、48 2 MIL-G- 2 6 6 1 1 MIL-G-81704 MIL-B-81793 STANDARDS Federal FED-STD-595 Preservation-Packaging, Methods of Magnesium Alloy, Processes for Corrosion Protection of Environmental Testing, Aeronautical and Associated Equipment, General Specification for Chemical Films for Aluminum and Aluminum Alloy
8、s Soldering Process, General Specification for Screw Threads, Standard Optimum Selected Series, General Specification for Anodic Coatings, for Aluminum and Aluminum Alloys Generator, Tachometer, Two-Pole, High Temperature, Aircraft, Type ME-6 Coating, Reflection Reducing, for Instrument Cover Glasse
9、s and Lighting Wedges Lighting, Integral, Aircraft Instrument, General Specif ication for Connectors, Electric, Circular, Miniature Quick. Dis connect Generator, Tachometer GEU-7-A, Miniature Glass, Aircraft Instrument, Lighting Wedge and Cover Bearing, Ball, Precision, for Instruments and Rotating
10、Components Colors 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- *NIL-I-23832A 66 W 7779706 OL322L W O STANDARDS (Continued) Military MIL-STD- 130 Identification Marking of U.S. Military Property MIL-STD- 143 Specifications and Standards, Order o
11、f Precedence for the Selection of MIL-STD-756 Reliability Prediction MIL-STD-781 Reliability Tests, Exponential Distribution s MIL-STD-794 Parts and Equipment Procedures for Packaging and Packing of MIL-STD-889 Dissimilar Metals MS18099 Indicator, Tachometer, Triple Pointer, Helicopter MS 24 367 Lam
12、p, Incandescent-Miniature Integral Lighting MS 2 45 15 Lamp Sub-Miniature Numerals and Letters, Aircraft Instrument Dial, Standard Form of Pointers, Dial, Standard Design of Aircraft Instrument (Copies of specifications, standards, drawings, and publications required by contractors in connection wit
13、h specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) P 3.1 First article. When specified (see 6.2), the contractor shall furnish sample unit(s) for first article inspection and approval (see 4.3.1 and 6.2). 3.2 Selection of Gover
14、nment documents. Specifications and standards for necessary commodities and services not specified herein shall be selected in accordance with MIL-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 in
15、vitation for bids, there are no suitable standard parts. In any case, commercial parts such as screws, bolts, nuts, cotter pins, having suitable properties, may be used provided: 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-23832A bb W 999
16、7Ob 0332282 T a. They can be replaced by the standard parts (MS or AN) without alteration. b. The corresponding part numbers are referenced in the parts list and if practicable, on the contractors drawings. 3.3 Materials. Materials shall conform to applicable specifications and shall be as specified
17、 herein. there are no applicable specifications, or which are not specifically described herein, shall be of the best quality, of the lightest practicable weight and suitable for the purpose intended, materials shall be encouraged to the maximum extent possible. Materials for which . The use of recl
18、aimed 3.3.1 Critical materials. Non-critical materials shall be used where practicable. to meet specification requirements, the material used shall be the least critical of those which are adequate for the purpose. shall be used for all parts of the tachometer indicator, except where otherwise speci
19、fied, Where the use of a critical material is essential 3.3.2 Non-magnetic materials. Non-magnetic materials 3.3.3 Metals. Metals shall be of the corrosive resistant type, or shall be suitably protected as specified herein to resist corrosion due to fuels, salt spray or atmospheric conditions, to wh
20、ich the switch 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 each other, unless suitably protected against electrolytic corrosion by means of protective coatings, meta
21、ls are in a sealed atmosphere as described in 3.4.3.2. Protective coatings will not be necessary if the 3.3.3.2 Magnesium alloy parts. Magnesium alloy parts shall be treated in accordance with MIL-M-3171. When abrasion resistance is a factor, an anodic treatment approved by the procuring activity sh
22、all be used, 3.3.3.3 Aluminum alloy parts, Where practicable, aluminum Small holes, pipe threads and case inserts need not be anodized. alloy parts shall be covered with an anodic film conforming to MIL-A- 8625. Aluminum alloys which do not anodize satisfactorily shall be coated with a chemical film
23、 in accordance with MIL-C-5541. 3.3.3.4 Iron and steel parts. Iron and steel parts shall be chromium, nickel or zinc plated in accordance with QQ-C-320, QQ-N-290 or QQ-2-325 respectively. requirements of paragraph 3.3.4, The class and type of plating shall meet the Provided by IHSNot for ResaleNo re
24、production or networking permitted without license from IHS-,-,-construction of the indicator are subjected to atmospheric or environmental conditions likely to cause corrosion in normal service life, they shall be protected against corrosion in a manner that will in no way prevent compliance with t
25、he 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 conditions shall not be used. for fungi shall not be used wht- _ _- =-_- _ _._ _._ Where used, t
26、hey shall be treated with a fungicidal agent acceptable to the procuring activity. If used in hermetically sealed enclosure, fungicidal treatment will not be necessary. . 3.3.6 Fumes and vapors. Materials used in the construction of the indicator shall not produce corrosive, deleterious, or toxic fu
27、mes or vapors under the conditions specified herein. designed for operation from the varying frequency i output of tachometer generators conforming to MIL-G-9398 or MIL-G-26611. The frequency of the generator output shall be equal to the speed at which the generator is rotating. The design shall be
28、such that with the . constructed that no parts will work loose in service and will withstand the normal shocks, vibrations and such other conditions as are incident to service, shipping, storage, and installation without failure. to facilitate as much as possible disassembly, repair or overhaul, ser
29、vice maintenance, and reassembly using those tools and items of maintenance equipment which are normally available as commercial standards. - 3.4.2 Stops. Each mechanism of the indicator shall be provided with a stop which upon reverse operation will stop the pointer motion between -2 and -5 Dercent
30、 indication. conform to MS18099. The case I ferrous metal, uniform in texture, having a smooth surface and shall be hermetically sealed. material, Color No. 37038 of FED-STD-595. The finishing material shall be of a durable type to withstand usage encountered in service. The case shall be finished w
31、ith a lusterless black I sealed and the desian-shall be such that the mechanism may be removed Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-between metallic and metallic, or metallic and vitreous mate - . .I hermetic seal is not intended to includ
32、e seals accomplished by gaskets. The removal of the mechanism and resealing of the case shall be possible without the use of any special tool, jig or fixture, unless such device is specifically approved by the procuring activity. 3.4.3.2 Filling medium. The filling medium shall be a The nitrogen usd
33、 shall be in mixture of 90 percent nitrogen and 10 percent helium or a filling medium approved by the procuring activity. accordance with BB-N-411, Type I, Class I, grade C. The filling medium shall contain not more than .O06 milligram of water vapor per liter (dew point -G5OC) at the filling pressu
34、re. The absolute pressure of the filling medium in the case shall be 1 - + 0.1 atmosphere. I 3.4.4 Weight. The indicator shall be so designed-that when completely assembled the weight shall not exceed 3.0 pounds. 3.5 Electrical requirements. I 3.5.1 Integral lighting. The Mc180999-2 tachometer indic
35、ator shall be provided with integral lighting in accordance with MIL-L-25467. 3.5.2 Lamps. The lamps shall be located within the indicator case. or in addition to the lamps specified in MIL-L-25467. Lamps conforming to 11824367 or MS24515-1 may be used in lieu of, 3.5.3 Electric connectors. The elec
36、tric connector used shall conform to MIL-C-26482 and MS18099. 3.5.4 Wiring. The external wiring shall be as shown in Figure 1. in auch a manner that individual wires may be easily traced, shall be secured mechanically to the terminals prior to soldering, where practicable. The three leads from the i
37、ndicator windings shall be designated as B, A, and C (conforming to phases 1, 2, and 3). to pins of the electric connector in such a manner that the indicator reading is positive when 3-phase power with phase sequence B-A-C is applied. rotation (when viewed from the shaft end), necessary to reverse
38、leads A and B at the generator plug. Internal wiring shall be color coded. neat and accomplished Wires The wiring shall be insulated from the instrument case. The leads shall be connected The wiring shown in Figure 1 is for counterclockwise generator Por clockwise rotation it is 3.5.5 Bearings. The
39、ball bearings used in the indicators shall be ABEC-5P, or better, and shall comply with the requirements of MIL-B-81793 3a5.5.1 Bearing lubricant. Unless selected from the lubricants listed in MIL-B-81793, the bearing lubricant shall be subject to approval by the procuring activity. be supplied to d
40、emonstrate the adequacy of the lubricant for which approval is requested. Sufficient engineering and test data shall If a light instrument oil or silicone oil is Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-INDICATOR MS18099-I OR- 2 (SEE NOTE I) E
41、NGINE I ENGINE 2 ROTOR BACBACBAC 4 1123456 ENGINE I GENERATOR ENGINE 2 Y- GE NE RATOR ROTOR I 7 GENERATOR 9 10 II 12 I LIGHT IN G TO 5V (FOR LIGHTED) I NDICATORS . MS18099-2 1 3 1; LNGINE I ,b, ENGINE 2 AC ROTOR INDICATOR MS18099-3 OR -4 (SEE NOTE 2) Note 1. in parallel. Two MS-18099-1 and/or MS1809
42、9-2 indicators may be connected DO NOT PARALLEL WITH THE -3 OR -4. Note 2. MS-18099-4 indicators may be connected in parallel. The MS18099-3 indicators may be connected in parallel. The DO NOT PARALLEL THE MS18099-3 AND -4; DO NOT PAWLEL WITH MS18099-1 OR -2. THE WIRING DIAGRAM SHOWS THE CONNECTIONS
43、 WHEN THE GENERATOR DRIVE SHAFTS TURN COUNTERCLOCKWISE (WHEN VIEWED FROM THE SHAFT END). GENERATOR SHELLS ARE THE “C“ CONNECTIONS AND SHOULD BE GROUNDED TO COMPLETE THE “C“ CIRCUITS. THE FIGURE 1. WBCNG 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,
44、-,-used, barrier coating in accordance with MIL-E-81793 shall be applied to the bearings. and relubricated just prior to installation in the indicator. Bearings which are not barrier coated shall be cleaned 3.6 Dial, and pointer. The dial shall be securely mounted in such a manner that it will not l
45、oosen or slip when the indicator is vibrated, not interfere with the proper location of any dial marking. If screws are used they shall be so located that they will 3.6.1 Visibility of dial, The pointers, numerals, at least 1/3 of the shortest graduations and all other specified markings on the dial
46、 shall be visible from any point within the frustum of a cone whose side makes an angle of 30 with a perpendicular to the dial and whose small diameter is the aperture of the case. 3.6.2 Dial marking. The dial shall be marked as shown in Unless otherwise specified, all visible portions of the dial b
47、lack Color No. 37038 of PED-STD-595 and all markings Figure 2. shall be lusterless on the dial shall be lusterless white Color No. 37875 of FED-STD-595. All markings shall be durable to withstand usage encountered in service. The form of the numerals and letters shall be in accordance with MS33558.
48、Numerals shall distinctly indicate the graduation to which it applies. If-practicable, each numeral shall be placed so that the center of area of the numeral is on the radial line joining the appropriate graduation and the center of the dial. Any confusion resulting in doubt as to the graduation to
49、which the numeral applies shall be cause for rejection. When several numerals are used in one group, the space between the numerals shall be not less than 1/64th inch. 3.6.3 Pointers. The pointera of the indicator shall be as light weight as practicable, sufficiently rigid to prevent oscillation under vibration and shall be firmly attached to the mechanism but shall also be readily adjustable. The pointers shall confor
