1、. M I L- D- 7 7 I 3 5 JULY 1951 MILITARY SPECIFICATION . DRIFT METER, TYPE .B-5 . This specification was approved by the Departinents of the Army, the Navy, and the Air Force for use of procurement services of the respective Departments. 1. SCOPE 1.1 quirements for procurement of the type B-s drift
2、meter, which is used in.the navigation of aircraft. This specification covers certain design repirements and all performance re- - 3. bids, shall form a part of this specification to the extent specified herein. APPLICABLE SPECIFICATIONS, OTHER PUBLICATIONS, AKD DRANINGS 2.1 2.1.1 Specifications.- F
3、ederal The following publications, of the issue in effect on date of invitation for QQ-A-354 QQ-A-591 QQ-P- Military m,-.502 8 MIL-E-5.556 1-F3775 MIL-P-6064 MIL-P-O MIL-P-6889 Aluminum-alloy (AL-24) (auminum-copper-magnesium Aluminum - Base - Alloy; Die Castings Plating; Cadmium (Electrodeposited)
4、(l.SO%)-manganese); bars, rods, shapes, and wire. Drawings and Data Lists; Preparation of (For Engines, Enamel; Camouflage, Quick Drying Filter; Eyepiece Packaging of Lightweight Aircraft Accessories Plates, Information and Identification Primer; Zinc-Chromate, for Aircraft Use Accessories and Other
5、 Auxiliary Equipment) Air Force-Navy Aeronautical AN-QQ-A-696 AN-E-3 Enamel; Aircraft, Gloss AN-s-126 Screw-Threads; Standard Aircraft Anodic-Films; Corrosion-Protective (for) Aluminum Alloys 2.1.2 Other Publications.- Air Force-Navy Aeronautical Bulletin No. 143 Specifications and Standards; Use of
6、 Bureau of Supplies and Accounts Navy Shipment Marking Handbook 2.1.3 Drawings.- Military Standards (Sheet) t .-,e. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Air Force-Navy Aeronautical Design Standard Drawing ANI110398 Metals - Definition of D
7、issimilar (Copies of this specification and copies of other publications referenced herein or required for Government procurement, and the Index of Militam- Aeronautical (AN or MIL) Standards, may be obtained upon application to the Commanding Officer, U. S. Navd Air Station, Johnsville, Pennsylvani
8、a.) 3. REQUIS 3.1 Materials.- 3.1.1 Metals.- Metals shall be of the corrosion-resisting type or suitably pro- tected to resist corrosion in salt spray or atmospheric conditions to which the.drift meter may be subjected when in storage or during normal service life. 3.1.1.1 Dissimilar Metals,- Unless
9、 suitably protected against electrolytic corro- Dissimilar sion, dissimilar metals shall not be used in intimate contact with each other, metals are defined in Drawing DI-0398. 3.1.2 Nonmagnetic Materials.- Nonmagnetic materials shall be used for all parts of the drift meter except where magnetic ma
10、terials are essential. 3.1.3 Fungus-Proof Materials.- Materiais which are not nutrients for fungi shall be used 50 the greatest extent practicableo must be used, such materials shall be treated with a fungicidal agent, as approved by the Procuring Serviceo 3 .l.4 parts, and Government certification
11、and approval of processes and equipment, which are not specifically designated herein and which are necessary :or the execution of this specifica- tion, shall be selected In accordance with ANA Bulletin No, lu, except as provided in the following paragraph. Where materials which are nutrients for fu
12、ngi Selection of Materials.- Specifications and standards for all materiais, 3.1.4.1 AN or JAN Standard Parts,- AN or JAN Standard parts shall be used wherever they are sUitablVhal1 be identified on the drawing by their part numbers. Commercial utility parts such as screws, bolts, nuts, cotter pins,
13、 etc., may be used, provided theypossess suitable properties and are replaceable by the AN or JAN Stand- ard parts without alteration, and provided the corresponding AN or JAN part numbers are referenced in the parts list and, if practicable; on the contractoris drawings. In the event there is no su
14、itable corresponding AN or JAN Standard part in effect on date of in- vitation for bds, commercial parts may be used provided they conform to all requirements of this specification. 3.2 Design.- The outline,dimensions of the drift meter shall conform to Standard Fhedrlft meter shall be designed to i
15、nclude an opttcal system, a pantograph, M528022. a computer, channel rails, a gasket assembly and a mechanism frame and base. 3.3 Construction.- The drift meter shall be sq constructed as to withstand the normal strains, jars, vibrations, and such other conditions as are Incident to shipping, storag
16、e, installation, and service without failure. 3.31 Optical =stem.- The optical system shall consist of an achromatic objec- tive, field le-nd eye lens. a distant object, reversed and inverted, on the reticle. space shall be not less than 35 degrees. defects when looking through the drift meter, and
17、shall be so adjusted that there shall be no marallax between the centers of the timing lines and the image of a distant object when The objective and field lens combined shall image The optical system shall be free from visible The field of view in the object Provided by IHSNot for ResaleNo reproduc
18、tion or networking permitted without license from IHS-,-,- 3.3;l.i The focal lengths of the optics, dimensions.of the reticle, and accuracy of mirror positioning shall be maintained within limits that permit ground speed measurement withinsan accuracy of 22 percent. 3.3.1.2 Reticle.- A reticle, conf
19、orming to figure 1, that will rotate in unison with the drift index, shall be provided on the field lens in the periscope assembly of the drift meter., 3.3.1.3 E$e Lens.- The eye lens shall be so focused that a virtual image of a dis- tant object shall be formed at a distance of between 1.1 and 2.6
20、meters (3.61and 8.53 fee$. 3.3.2 Pantograph.- The pantograph action shall be smooth and free. When the Po and the fact that the Govern- ment may have formulated, furnished, or in any way supplied the said drawings, specifications, or other data is not to be regarded by implication or otherwise as in
21、 any manner licensing the holder or any other person or corporation, or conveying any rights or permission to manufacture, use, or sell any patented invention that may in any way be related thereto Custodian : I- Navy - Bureau of Aeronautics Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
