1、MIL-I-188OLIB bb W 7777906 0127758 7 W . MIL-1-18804B 22 JUNE 1964 SUPERSEDING 13 JANUARY 1959 MIL-I-l8804A(ASG) MILITARY SPECIFICATION *INDICATOR, VERTICAL SPEED, 0-6000 FPM, 24NCH Th 3.2.i Commercial $arts. Commercial parts having suitable properties shall be used, where on the date of invitations
2、 for bids, there are no suitable standard parts. In any case, commercial parts, such as screws, bolts, nuts, cotter pins, having suitable properties shall be used provided : (a) They can be replaced by the stand- ard parts (MS or AN) without alteration. (b) The corresponding standard part numbers ar
3、e referenced in the .parts list and if practicable, on the contractors drawings. ,“LC-“ T L /-“ “ -=- “-. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-* 3.2.2 Standard parts. With the exception of 3.2.1, MS and AN standard parts shall be used wher
4、e they suit the purpose. They shall be identified on the drawings by their part numbers. * 3.3 Materials. Materials shall conform to applicable specifications and shall be as spec- ified herein. Materials for which there are no applicable specifications, or which are not specificaly described herein
5、, shall be of the best quality, of the lightest practicable weight and suitable for the purpose intended. * 3.3.1 C7.itical materials. Noncritical ma- terials shall be used where practicable. Where the use of a critical material is essen- tial to meet specification requirements, the materiai used sh
6、all be the least critical of those which are adequate for the purpose. 3.3.2 Nonmagnetic materials. Nonmag- netic materials shall be used for all parts of the indicator except where magnetic materi- als are essential. * 3.3.3 Metals. Metals shall be of the cor- rosion resistant type, or shall be sui
7、tably protected as specified herein to resist corro- sion due to fuels, salt spray or atmospheric conditions to which the vertical speed indica- tor may be subjected when in storage or dur- ing normal service life. * 3.3.3.1 Dissimiktr metals. Dissimilar metals as defined in M533586 shall not be use
8、d in intimate contact with each other, un- less suitably protected against electrolytic corrosion by means of protective coatings. * 3.3.3.2 Magnesium alloy parts. Magnesi- um alloy parts shall be treated in accordance with Specification MIL-M-3171. When abra- sion resistance is a factor, an anodic
9、treat- ment approved by the procuring activity shall be used. * 3.3.3.3 Aluminum alloy pavts. Where practicable, aluminum alloy parts shall be covered with an anodic film conforming to Specification MIGA-8625. Small holes, pipe threads and case inserts need not be anodized. Aluminum alloys which do
10、not anodize sat- -. . / MILI-18804B isfactorily shall be coated with a chemical film in accordance with Specification MIL- C-5641. 8 3.3.3.4 Iron and steel parts. Iron and steel parts which are in hermetically sealed cases shall be cadmium plated in accordance with Specification QQ-P-416. Parts whic
11、h are not in sealed cases shall be chromium, nickel, or zinc plated in accordance with Specification QQ-C-320, QQ-N-290, or QQ- 2325 respectively. Parts in a confined space in the presence of organic material shall be tin-cadmium plated in accordance with spec- ification MIGP-23408. * 3.3.4 Protecti
12、ve treatment. When ma- terials are used in the construction of the indicator that are subject 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 the performanc
13、e requirements of this specifi- cation. 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. * 3.3.5 Funguaqroof mateqials. Materials which are nutrients for fungi shall
14、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. * 3.3.6 Fumes and vapors. Materials used in the construction of the indicator shall not produce corrosive, deleterious, or toxic fumes or vapors under th
15、e conditions specified herein. 3.4 Design and construction. The indi- cator shall conform to MS28075. The indi- cator shall be so designed to operate from atmospheric pressure changes to give a visual indication of rates of ascent or descent from O to 6000 feet per minute (fpm). The indi- cator shal
16、l be constructed to withstand the normal shocks, vibrations and such other conditions as are incident to service without failure, shipping, storage, and installation, 3 I-, -i Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-I-18804B * 3.4.1 Oper
17、ating mechunism. The operab ing mechanism shall be of the leak type and shall be sufficiently rugged to prevent small distortion of the case from affecting the accuracy of the indicator. Cy. 3.4.2 Zero-setting mechanism. A Zero- setting system controlled by a slotted setting shaft or screw shall be
18、located as shown on MS28075 and shall permit the instrument pointer to be set to indicate zero. The use of the zero-setting system shall not change the calibration of the indicator. * 3.4.3 Stops. Suitable stops shall be in- corporated within the mechanism to limit pointer movement. The pointer shal
19、l rotate to the 6000 foot graduation plus inch on both ascent and descent scales. * 3.4.4 Maintemnce. The design of the indi- cator shall be reasonably simple to facilitate as much as possible disassembly, repair or overhaul, service maintenance, and reassem- by using those tools and items of mainte
20、- nance equipment which are normally available as commercial standards. 3.4.5 Cme. The indicator case shall con- form to MS28076. The case and mounting flange shall be made of non-ferrous, low density metal, uniform in texture, having a smooth surface. The case shall be finished with a lusterless bl
21、ack material, Color No. 37038 of FED-STD-595. The finishing ma- terial shall be of a durable type to withstand usage encountered in service. * 3.4.6 Weight. The indicator shall be so designed that when completely assembled the weight shall not exceed 1.5 pounds. * 3.4.7 Screw threads. Screw threads
22、0.060 inch in diameter or larger shall be in accord- ance with Specification MILS-7742. * 3.5 Electrical requirements (integral lighted indicator) * 3.5.1 Interml wiring. Internal wiring and the application thereof shall be in ac- cordance with Specification MILE-5400. 3.5.2 Integral lighting. The l
23、ighted indi- cators shall be provided with integral lighting in accordance with Specification MILL- 25467. * 3.5.3 Lumps. The lamps for the lighted indicator shall be located within the indi- cator case. Lamps conforming to MS24367- 680, -715 or MS24515-1 may be used in lieu of, or in addition to, t
24、he lamps specified in Specification MILL25467. When using MS- 24367-715 lamps a minimum of (3) three lamps shall be used. * 3.5.4 Electric Connectors. The electric connectors used shall conform to Specifica- tion MIL-C-26482 and MS28076. * 3.5.5 Wiring. Pins A and C shall be used for lighting. 3.6 D
25、ial and pointer * 3.6.1 Dial. The dial shall be securely mounted in such a manner that it will not loosen or slip when the indicator is vibrated. If screws are used they shall be so located that they will not interfere with the proper location of any dial marking. * 3.6.2 Visibility of dial. The poi
26、nter, nu- merals, at least 1/3 of the shortest graduations and all other specified markings on the dial 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 indicator case. * 3.6.
27、3 Dial murking, The dial shall be marked as shown in Figure 1. Unless other- wise specified, all visible portions of the dial shall be lusterless black Color No. 37038 of FED-STD-595 and all markings on the dial shall be lusterless white Color No. 37875 of FED-STD-595. All markings shall be dur- abl
28、e to withstand usage encountered in serv- ice. The form of the numerals and letters shall be in accordance with MS33558. NU- merals shall distinctly indicate the gradua- tion to which each applies. If practiceable, each numeral shall be placed so that the cen- ter of area of the numeral (S) is on th
29、e radial line joining the appropriate graduation and the center of the dial. Any confusion result- ing in doubt as to the graduation to which the numeral applies shall be cause for rejec- tion, When several -numerals are used in one Provided by IHSNot for ResaleNo reproduction or networking permitte
30、d without license from IHS-,-,-group, the space between the numerals shall be not less than %*th inch. * 3.6.4 Pointer. The pointer of the-indicator shall be as light weight as practicable, suffi- ciently rigid to prevent flexing under vibra- tion and shall be firmly attached to the mechanism but al
31、so shall be readily adjust- able to zero position. The shaded portion of the pointer shall be finished lusterless white, Color No. 37875 of FED-STD-595. The un- shaded portion shall be finished lusterless black, Color No. 37038 of FED-STD-695. The pointer shall be suitable for integral lighting and
32、shall conform to MS33585-1, except that the length of the pointer shall be such that the tip will overlap from 1/3 to % of the length of the shortest graduation. * 3.7 Cover glass. The quality of the cover glass shall be in accordance with Specifica- tion DD-G-451, Type II, Quality AA. Any flaws per
33、mitted by Specification DD-G-451 shall not interfere with reading of the dial. The dimensions of the cover glass shall be in accordance with MS28105. * 3.7.1 Cover glass mountiag. The distance from the inner surface of the cover glass to the surface of the dial on which the marking is applied shall
34、not exceed 0.188 inch. * 3.8 Performance. The indicator shall per- form satisfactorily when subjected to the tests specified in Section 4 of this specifica- tion. * 3.9 Identification of product * 3.9.1 Nameplate. A nameplate shall be securely attached to the exterior of the case and shall be marked
35、 in accordance with the requirements of MIGSTD-130. * 3.9.2 Manufacturers part %umber. The manufacturers part number on the name- plate shall be identical with the manufac- turers engineering production drawing number including applicable dash numbers if drawing is tabulated and covers more than one
36、 part. * 3.10 InterchangeabiIity. All parts having the same manufacturers part number shall be directly and completely interchangeable ,- - MILI-18804B with each other with respect to installation and performance. Changes in manufacturers part number shall be governed by the draw- ing number require
37、ments of Specification * 3.11 Installation * 3.11.1 Imtallaiion instructions. The con- tractor shall furnish with each indicator one copy of installation instructions with illus- trations and diagrams if necessary. Prior to printing, two copies shall be furnished to the procuring activity for approv
38、al. The instruc- tions shall be printed on paper either 81/2 by 11 or II by 17 inches. * 3.11.2 Mounting hardware. The contrac- tor shall furnish mounting screws and self locking nuts conforming to Specification MILN-3336, in sufficient quantity to install the indicator. The screws shall be No. 6- 3
39、2NC-2, round head brass machine screws having a durable, lusterless black, oxidized or nickel finish. The length shall be sufficient to mount the instrument on panels up to 3/8 inch thick. * 3.11.3 Envelope. An envelope furnished by the contractor shall be packaged with each indicator and shall be m
40、arked as fol- lows : MILD-70327. IMPORTANT THIS ENVELOPE CONTAINS INSTALLATION INSTRUCTIONS, MOUNTING SCREWS AND NUTS. * 3.12 Workmanship. The indicator, in- cluding all parts and accessories, shall be constructed and finished in a thoroughly workmanlike manner conforming to Specifi- cation MILE-540
41、0. * 3.12.1 Soldering. Soldering shall be per- formed in accordance with Specification MIL-S-6872. 4. QUALITY ASSURANCE PROVISIONS * 4.1 Unless otherwise specified in the con- tract or purchase order, the supplier is responsible for the performance of all in- spection requirements as specified herei
42、n. Ex- 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMERALS SHALL DISTINCTLY 1NDIC;ATE THE! UmmON To WHICH EACH AFPLIES ZgRO GRf#UATION . - loo-FI! AND OO-FT GBADUATIONG - 4 NUMERALS o, i, 2, 4, 6 lOO-E*J! GRADUATIONS ARC CONNECTING 6000-m MARK
43、S LE-NG “UI?“, “DOWN“ I;EWG “1000 m MIN“ BACKGROUND OF DUIL M628075- (add proper dash number BEIGm OR LENGW f. oxo 1-11- ,047 WIDTH OF LINE f. 002 FINISH - . LUSBS BLACK m-STD-595 Color No. 37038 FIGURE 1. Dial an PointeV Marloings cept as otherwise specified, the supplier may utilize his own facili
44、ties or any commercial laboratory acceptable to the Government. The Government reserves the right to perform any of the inspections set forth in the speci- fication where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.2 Classacation of tes
45、ts, The inspection 6 and testing of the indicator shall be classified as follows. (a) Qualification tests: Qualification tests are those tests performed on sample indicators submitted for qualification as a satisfactory product, (b) Qualitg conformance tests: Quality conformance tests are those tesb
46、 ,/-“ “ 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-performed on indicators manu- factured and submitted for ac- ceptance under contract. * 4.3 Qualification tests. The qualification tests of the indicator shall consist of all of the tests of t
47、his specification specified under the paragraph headed Test methods. * 4.3.1 Qwrlification test sample instruc- tim. Qualification test samples shall consist of three indicators manufactured in accord- ance with this specification. The indicators submitted or qualification testing shall not have bee
48、n previously tested except for the Individual tests. The samples shall be for- warded to the testing laboratory designated in the Letter of Authorization. * 4.3.1.1 Qualification test sample identif- -cation. The test samples shall be plainly identified by securely attached, durable tags marked with
49、 the following information: Sample for Qualification Testing INDICATOR, VERTICAL . SPEED, Submitted by (Manufacturers name, date) for Qualification Testing in ac- cordance with Specification MIL-I- 18804B under authorization (refer- ence letter authorizing tests), MS28075 (Add proper dash number.) Manufacturers Part Number 4.4 Quality conformance tests. The quality conformance tests shall consist of the Individual tests and the Samp
