1、1 - MIL-G-7734C bb m 7777706 0326308 5 4 Dial Figure la lb 3, IC . le If .Id 1g c 5 Pointer Marks MIL-G-7734C 16 November 1981 SUPERSEDING MIL-G-7734B 13 August 1959 MILITARY SPECIFICATION r la la lb lb Id If If 1g GAGESi PRESSURE, ENGINE AND UTILITY AIRCRAFT 1, 2 3, 4 1, 2 3, 4 1, 2 1, 2 3, 4 1, 2
2、This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers 19 flange-mounted engine and utility aircraft pressure gages. 1.2 Classification. The gages shall be furnished in the part numbers listed in column 1 of
3、Table I, as specified (see 6.2). MCt No- MS28061-1 MS28061-2 MS28061-3 MS28061-4 MS2 8061-5 MS28061-6 MS2 806 1- 7 MS28063-1 MS28063-2 MS2 806 3- 3 MS28063-4 MS2 8064-3 MS28064-4 MS28064-5 MS 2 8064-6 MS28064-7 MS 2 8064- 8 MS 2 8064-9 MS28064-10 TABLE I. Gage details. Single Single Single Single Si
4、ngle Single Single Single Single Single Single Dual Dual Dual Dual Dual Dual Dual Dual 3 - Case.Typ General Specification for Anodic Coatings, for Aluminum and Aluminum Alloys Luminescent Material, Fluorescent Colors . :. . , Marking for Shipment and Storage Identification Marking of U.S. Military P
5、roperty Parts and Equipment, Procedures for Packaging and P.acking of Environmental Test Methods Dtscimilar Metals Commercial Packaging of Supplies and Equipment . 8 -.:J, 4. :,i: . = - - 15 ,+-a2 I -u 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
6、,-mIL-G-7734C bb 77777Ob 012b310 3 STANDARDS (Continued) Military (Continued) MS2806 1 MS28063 MS28064 MIL-G-7734C Gages, Pressure, Engine and Utility, 2 Inch, Flange-Mounted, Back Ports Gages, Pressure, Engine and Utility, 2 Inch, Flange or Port-Mounted, Bottom Port Gages, Pressure, Engine and Util
7、ity, 3 Inch, Flange Mounted, Back Ports MS2 8 105 Window, Dial-Aircraft Instrument Cover, Glass MS3 3558 Numerals and Letters, Aircraft, Instrument Dial, Standard Form of MS33585 Pointers, Dial, Standard Design of Aircraft Instrument (Copies of specifications, standards, drawings, and publications r
8、equired by contractors in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) REQUIREMENTS 3.1 Qualification:.The gage furnished under this specification shall be a product which has been tested and has passed the
9、qualification tests specified herein, and has been listed on or approved for listing on the applicable Qualified Products List. 3.2 Materials, Materials shall conform to applicable specifications and shall be as specified herein. When materials are used which are not specifically designated, they sh
10、all be entirely suitable for the purpose intended. 3.2.1 Recycled materials. Recycled materials may be used provided they meet the requirements of this specification and do not adversely affect the performance of the gages. 3.2.2 Metals. Metals shall be of corrosion-resistant types unless suitably p
11、rotected to resist corrosion during storage and normal service life. 3.2.3 Dissimilar metals. Dissimilar metals, as defined by MIL-STD-889 shall not be used in intimate contact with each other unless suitably protected against electrolytic corrosion by means of protective coatings. . 3.2.4 Nonmagnet
12、ic metals. Nonmagnetic metals shall be used for all parts of the gage, except where magnetic materials are essential. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-7734C 3.2.5 Fungus-proof material. Materials which are nutrients for fungi s
13、hall not be used where it is practicable to.ayoid them. External materials which are nutrients for fungi shall be treated with a fungicidal agent, as approved by the procuring activity. ,. 3.2.6 Luminescent materials. Luminescent material shall conform to MIL-L-25142, type I or III, as applicable. 3
14、.2.7 Protective treatment. When materials are used in the construction of the gages that are subject to corrosion in salt air or other atmospheric conditions likely to occur during service usage, they shall be protected against such corrosion in a manner that will in no way prevent compliance with t
15、he performance requirements of this specification. Protective coatings and finishes which will crack, chip, or scale during normal service life or due to extremes of atmospheric conditions shall not be used. 3.2.8 Materials and parts. Specifications and standards for all materials and parts, and Gov
16、ernment certification and approval of processes and equipment, which are not specifically designated herein and which are necessary for the execution of this, s,pecification, shall be selected in accordance with procedures established by the procuring activity except as provided herein. used whereve
17、r they are suitable for the purpose, and shall be identified on the drawings by their part numbers. Commercial utility parts such as screws, bolts, nuts, cotter pins, etc., may be used, provided they possess suitable properties and are replaceable by the standard parts (MS or AN) without alteration
18、and provided the carresponding standard part numbers are referenced in the parts list and, if practicable, on the contractors drawings. standard part in effect on date of invitation for bids, commercial parts may be used provided they conform to all requirements of this specification. Standard parts
19、 (MS or AN) shall be In the event there is no suitable corresponding 3.3 Design and construction. 3.3.1 Single or dual. Each gage shall be single or dual as specified in column 2 of Table I. 3.3.2 Design. The design of each gage shall be reasonably simple to permit overhaul or repair without requiri
20、ng numerous special tools and fixtures. The gages shall be so constructed as to withstand the normal strains, jars, vibrations, and such other conditions as are incident to shipping, storage, installation, and service, without failure. The mechanism including the dial of each dual gage shall be moun
21、ted on a metal plate which forms the back of the instrument case and which is secured to it by at least four screws. The mechanism shall be removable from the rear of the case as a unit. single gages. Such construction is optional for ,. 4 Provided by IHSNot for ResaleNo reproduction or networking p
22、ermitted without license from IHS-,-,-MIL-G-7734C Range (psi unless otherwise shown) O to 10 inches of mercury o to 20 O to 25 o to 35 o to 200 O to 300 o to 2,000 o to 5,000 3.3.3 Operating mechanism. The operating mechanism shall be subject to approval of the procuring activity. Setting 10.3 + 0.1
23、 22 T 1 27 2 1 37 + 1 210 2 5 310 + - 5 2,200 i 50 5,300 + 100 - - - 3.3.4 Mechanism adjustment. Each gage shall be provided with means to adjust or correct each indication in case this becomes necessqry during the service life of the instrument. The means of adjustment shall be reasonably simple bu
24、t need not be external to the case. On dual gages, means shall be provided within the mechanism for - accomplishing zero correction adjustments without removal of the pointers. 3.3.5 Isolation of fuel. Each gage which is identified as a fuel pressure gage shall be so designed that the fluid applied
25、to the pressure connection of the gage cannot touch any part of the gage other than the pressure connections, the pressure sensor(s), the inside of the. case of the gage, and any necessary connecting tubing, etc. 3.3.6 Independent sensors in dual fuel pressure gages. Each dual gage which is identifi
26、ed as a fuel pressure gage shall contain two differential pressure sensing devices operated by a total of four different pressures. 3.3.7 Pressure stops. 3.3.7.1 Overpressure stoD. An. overDressure stoD shall be I- provided for each pointer, shall be so designed as to restrain the mechanism rather t
27、han the pointer, and shall allow pointer travel beyond full scale. The setting of the overpressure stop shall be as indicated - in Table II, 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-G-7734C 66 979970b 0326333 9 E - MIL-G-7734C 3.3.7.2 Z
28、ero pressure stop. A pressure stop shall be provided 9. for each pointer, designed to restrain the mechanism rather than the pointer, to protect the gage from sudden loss of pressure. 3.3.8 Case. The case of each gage shall conform to the standard for the part number of the gage, The case of each ga
29、ge designated by “AT“ in column 3 of Table I shall be airtight. designated by “RT“ in column 3 of Table I shall be raintight except for a small vent hole in the bottom. The case of each gage 3.3.8.1 Body. The case shall be made either of nonferrous low-density metal or of synthetic material, shall b
30、e uniform in texture, and have a smooth surface. black material, color No. 37038 of FED-STD-595, of a durable type to withstand usage encountered in service. Synthetic material shall be of the thermosetting type, composed of a suitable filler and phenol condensation product binder. The case shall be
31、 finished with a lusterless, 3.3.8.2 Bosses. Flats shall be provided on the sides of the boss for a minimum distance of 1/4 inch to enable use of a wrench when tightening the mating fittings. 3.3.8.3 Inserts. Unless otherwise specified, all inserts for the tubing connections shall be straight thread
32、s conforming to MIL- * S- 7 74 2. 3.3.8.4 Identification of ports. The pressure and vent ports for each differential pressure sensor shall be located and marked The port(s) for the pressure sensor which operates each pointer of each dual gage shall be located and marked “To No. (1, 2, 3, or 4, as ap
33、plicable) Engine“ as shown on MS28064. respectively, as shown on MS28061 or MS28064, as applicable. lip11 and llvll, 3.3.8.5 Cover glass. The cover glass shall be clear, flat and free from flaws which interfere with normal reading of the gage, and shall conform to MS28105. 3.3.8.6 Bezel ring. The be
34、zel ring, if used, shall be made Provision shall be made for the replacement of the cover of aluminum alloy or a synthetic material, and shall have a durable black finish. glass by removal of the bezel ring. 3.3.8.7 Dial-to-cover-glass distance. The distance between the dial and the cover glass shal
35、l be as small as.practicable and shall - not exceed O. 125 inch. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-7 734.C: 3.3.8.8 Mounting nuts. When attached insert nuts are specified, each mounting lug as indicated on the applicable drawing
36、 shall be fitted with a No. 6-32 NC-2 self-locking-type insert nut so attached as to prevent loosening under an axial load of 25 pounds and to prevent turning more than a fraction qf a turn under a torque of 10 pound-inches, applied sep ar at e ly . 3.3.9 - Dial. The dial of each gagecshall conform
37、to Figure 1 for the style under Figure 1 specified in column 4 of Table I. form of all letters and numerals on the dial shall conform to MS33558. All markings shall be durable to withstand usage encountered in service and shall conform to Table III. Numerals shall distinctly indicate the graduation
38、to which each applies. So placed that the center of mass of the numeral is on the radial line joining the appropriate graduation and the center of the dial. The If practicable, each numeral shall be TABLE III. Dial markings. Numer als All single gages All 0.240 inch high and 0.031 inch wide, except
39、on Part Nos. MS28061-6, T6 and MS28063-1, T1 which are 0.188 inch high. All dual gages All 0.140 inch high and 0.020 inch wide. On Part Nos. MS28064-3, T3 and MS28064-4, T4 only “O“, “lO“, and 1120“ , and on Part Nos. MS28064-5, T5 and MS28064-6, T6 only “50“, “lOO“, and “150“, are marked in lumines
40、cent mat erial. v- Major graduations I Minor graduations 1 Lettering All 3/16 inch long and 0.031 tO.005 - inch wide. All gages All 1/8 inch long and 0,016 - +0.005 inch wide, All O. 125 inch high and 0.020 inch wide , except “X1000“, “psi“, and “in. Hg“, which are 0.063 inch high and 0.010 inch wid
41、e. “X1000“ shall be marked in durable dull black. . . . _- . . . . . . . . 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-7734C L450- TOLERANCES: ANGLES? to FIGURE 1. Dlals. 8 Provided by IHSNot for ResaleNo reproduction or networking permit
42、ted without license from IHS-,-,- MIL-G-7734C 66 M 9999906 022b32b 4 W MIL-G-7734C 3.3.9.1 Diameter of scale circle. The diameter across the outer ends of the graduations of the scale of each gage shall be at least equal to the minimum diameter of the aperture required by the standard for the case o
43、f the gage 1/16 inch, and shall be not greater than the diameter of the aperture. 3.3.9.2 Dial finish. The background of the dial of each gage shall be finished with lusterless, black material, color No. 37038 of FED-STD-595. All markings on the dial shall be finished in fluorescent- luminescent mat
44、erial or lusterless, white material, color No. 37875 of FED-STD-595, as specified by the procuring activity. (See 6.2). 3.3.9.3 Marking. The MS part number of the gage shall be marked on the face of the dial in durable dull black letters and numbers 1/16 inch high. dial. No other identification numb
45、er shall appear on the 3.4 Pointers. Each single gage shall include one pointer which shall conform to MS33585. which shall conform to MS33585 for the types under MS33585 bearing the identifying numbers specified in column 5 of Table I. The nearer pointer to the dial shall bear the smaller of the tw
46、o numbers. The nearer pointer to the cover glass shall bear the larger of the two numbers. Pointers shall be light and sufficiently rigid to prevent oscillation under vibration. Pointers shall be firmly attached to the mechanism. All parts of each pointer which are shown as shaded in MS33585 shall b
47、e finished ia f luorescent-luminescent material. . Each dual gage shall include two pointers 3.5 Interchangeability. All parts having the same manufacturers part number shall be directly and completely interchangeable with each other with respect to installation and performance. in manufacturers par
48、t numbers shall be governed by the drawing requirements of MIL-D-1000, or as otherwise specified by the procuring activity. Changes 3.6 Finish. 3.6.1 Aluminum-alloy parts. Aluminum-alloy parts shall be covered with an anodic film conforming to MIL-A-8625, except as follows. 3.6.2 Dials. Dials, small
49、 holes, and case inserts need not be anodized. 3.6.3 Aluminum alloys which do not anodize satisfactorily shall be coated with a chemical film in accordance with MIL-C-5541. 3.6.4 Where the primary purpose of the treatment is to afford a suitable paint base, chemical treatments in accordance with MIL-C-5541 may be used in lieu of anodizing. 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license f
