AIR FORCE MIL-PRF-27197 E-2012 INDICATOR AIRSPEED MACH NUMBER AND MAXIMUM ALLOWABLE SPEED.pdf

1、AMSC N/A FSC 6610 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. MIL-PRF-27197E 11 June 2012 SUPERSEDING MIL-PRF-27197D 24 November 1997 PERFORMANCE SPECIFICATION INDICATOR, AIRSPEED, MACH NUMBER AND MAXIMUM ALLOWABLE SPEED INCH-POUND Comments, suggestions, or ques

2、tions on this document should be addressed to Oklahoma City Air Logistics Center/ENSDAA, 3001 Staff Drive, Suite 1AB81A, Tinker AFB, OK 73145 or emailed to af71tinker.af.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online

3、 database at https:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-27197E 2 This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification cove

4、rs nonlighted and integrally lighted combination indicated airspeed (IAS) and mach number indicators. 1.2 Classification. Indicators will be of the following classifications as specified (see 6.2). AVU-8B/A Improved Dial, and Cover Glass Coated with Multilayer Anti-reflection Coating of High Efficie

5、ncy AVU-8C/A Cover Glass Coated with Multi-layer Anti-reflection Coating of High Efficiency and with 3/8 Inch Static and 1/4 Inch Pitot Tubing Connectors ME-4 Nonlighted, Dial Fluorescent, Luminescent Material Conforming to AF drawing 8988994. 2. APPLICABLE DOCUMENTS 2.1 General. The documents liste

6、d in this section are specified in sections 3, 4, or 5 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of these lists, do

7、cument users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards and handbooks f

8、orm a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. FEDERAL STANDARDS FED-STD-595/36595 - Gray, Flat or Lusterless FED-STD-595/37038 - Miscellaneous, Flat or Lusterless FED-STD-595/3787

9、5 - Miscellaneous, Flat or Lusterless DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-C-14806 - Coating, Reflection Reducing, for Instrument Cover Glasses and Lighting Wedges (for guidance only) MS28105 - Cover Glass, Aircraft Instrument Dial MS33558 - Numeral and Letters, Aircraft Instrument Dial, Standar

10、d Form of Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-27197E 3 (Copies of these documents are available online at https:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Ph

11、iladelphia, PA 19111-5094.) 2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of the document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the

12、solicitation or contract. 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. AMERICAN SOCIETY FOR QUALITY (ASQ) ASQC-Z1.4 - Sa

13、mpling Procedures and Tables for Inspection by Attributes (DoD adopted) (ASQ documents may be obtained online at http:/www.asq.org or from American Society for Quality, P.O. Box 3005, Milwaukee, WI 53201-3005 or 600 North Plankinton Avenue, Milwaukee, WI 53203, USA.) ASTM INTERNATIONAL ASTM B117 - S

14、alt Spray (Fog) Apparatus, Operating (DoD adopted) (ASTM documents may be obtained online at http:/www.astm.org/ or from American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) NATIONAL AERONAUTICS AND SPACE ADMINISTRATION (NASA) NASA-TN-D-882 - Tables o

15、f Airspeed, Altitude, and Mach Number Based on Latest International Values for Atmospheric Properties and Physical Constants (NASA documents may be obtained online at http:/ntrs.nasa.gov/ or from NASA Headquarters, Suite 5K39, Washington, DC 20546-0001.) RADIO TECHNICAL COMMISSION FOR AERONAUTICS (R

16、TCA) RTCA/DO-160 - Environmental Conditions and Test Procedures for Airborne Equipment (RTCA documents may be obtained online at http:/www.rtca.org/ or from RTCA, Inc, 1828 L Street, NW, Suite 805, Washington, DC 20036.) Provided by IHSNot for ResaleNo reproduction or networking permitted without li

17、cense from IHS-,-,-MIL-PRF-27197E 4 SAE INTERNATIONAL SAE-AS5202 - Port or Fitting End, Internal Straight Thread (SAE documents may be obtained online at http:/www.sae.org/ or from SAE World Headquarters, 400 Commonwealth Drive, Warrendale, PA 15096-0001 USA.) 2.4 Order of Precedence. Unless otherwi

18、se noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3

19、. REQUIREMENTS 3.1 Qualification. (Item) furnished under this specification shall be products that are authorized by the qualifying activity for listing on the applicable qualified products list before contract award (see 4.2 and 6.3). 3.2 Recycled, recovered, or environmentally preferable materials

20、. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. 3.3 Materials. All materials shall be suita

21、bly treated to resist corrosion due to electrolytic decomposition, fungus, salt fog, and any other condition that may be encountered during operational use and storage. Nonmagnetic materials shall be used for all parts of the indicator where possible. The use of toxic chemicals, hazardous substances

22、, or ODCs shall be avoided whenever feasible. 3.4 Interface. (See 6.4.4). 3.4.1 Dimensions. The indicator and case shall conform to Figures 1, and 3 through 5. 3.4.2 System interface. The indicator shall incorporate the following features: a. A pitot-static pressure-operated IAS mechanism that drive

23、s a pointer to IAS on a fixed dial as shown on figures 2 and 3, as applicable. b. A static pressure-operated altitude mechanism that drives a moving scale to indicate the mach number through the window on the moving mask as shown in Figure 2, 4, and 5. c. The mach number shall be indicated by the IA

24、S pointer on the moving scale at any combination of airspeed and altitude within the range of the indicator. 3.4.3 Maximum allowable equivalent airspeed (MAEAS pointer. The MAEAS pointer shall conform to Figure 5. The pointer shall be positioned as a function of equivalent airspeed (EAS) Provided by

25、 IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-27197E 5 and shall indicate, in terms of IAS, the EAS which has been set into the instrument by means of the adjustment on the rear of the indicator. The pointer shall be adjustable from 600 to 800 knots E

26、AS in 10 knots increments. AN MAEAS adjustment conforming to Figure 1 shall be provided on the rear of the indicator. The scale of adjustment shall conform to Figure 1. The mechanism shall allow the values of EAS between the numerals to be set by linear interpolation between the numbers of the scale

27、. 3.4.4 IAS index set knob and index pointer. An IAS pointer shall be provided as shown on Figures 2 and 5. The setting of IAS pointer shall be controlled by the IAS index set knob shown in Figure 2. The IAS index pointer shall be adjustable from 100 to 70 knots (minimum) IAS within 1 knot. The IAS

28、index pointer shall conform to Figure 5. 3.4.5 Case. The case shall conform to Figure 1. The case shall be entirely covered with a durable, lusterless black finish conforming to color number 37038 of FED-STD-595. 3.4.6 Bezel. The bezel shall have a lusterless black finish conforming to color number

29、37038 of FED-STD-595. The bezel shall be securely attached to the case. 3.4.7 Pointers. The IAS and MAEAS pointers shall conform to Figure 5. 3.4.8 Cover glass. The cover lass shall conform to MS28105 and shall be replaceable. If the cover glass is used as part of the lighting system, its size and s

30、hape may deviate from the dimensions specified on MS28105 to the extent required for proper lighting design. 3.4.9 Reflection-reducing coating. All reflecting surfaces shall be reflection-reduced according to MIL-C-14806. 3.4.10 Integral lighting (AVU-8B/A and AVU-8C/A only). The indicator shall inc

31、orporate parallel lighting circuitry as shown Figure 1. Other lighting requirements shall be specified in acquisition document (see 6.2), and shall operate on 5Vac or 5Vdc. 3.4.11 Dial. The indicator dial shall conform to Figures 2 and 3. The style and proportions of the numerals and letters shall c

32、onform to MS33558. Each numeral shall distinctly the graduation to which it applies. The graduation shall be located on the dial as shown on Figures 2, 3, and 4. 3.4.12 White markings (AVU-8B/A and AVU-8C/A only). The markings in Table I shall be finished in lusterless white color number 37875, or s

33、emi-gloss gray, color number 36595, of FED-STD-595 (see 6.4.1). The dimensions of the markings shall conform to Table I. 3.4.13 Fluorescent luminescent material (ME-4 only). The markings in Table I shall be finished in Fluorescent luminescent material (see 6.4.2). The dimensions of the markings shal

34、l conform to Table I. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-27197E 6 TABLE I Marking dimensions. Marking Height or length (0.016) Width of line or graduation (0.005) Numerals on IAS dial 0.250 Numerals on mach scale 0.5 through 1.6

35、0.156 1.8 through 2.2 0.125 Graduations corresponding to 100 knot increments As shown On Figure 3 Graduations corresponding to 50 knots increments below 400 knots (except 150) 0.219 0.030 above 400 knots 0.156 0.030 Graduations corresponding to 150knots increments 0.125 0.030 Graduations correspondi

36、ng to 10 knot increments 0.156 0.020 Graduations corresponding to 0.10 mach increments 0.125 0.030 Graduations corresponding to 0.05 mach increments 0.094 0.020 Lettering MACH NO. 0.094 0.020 Lettering KNOTS X 100 0.094 0.020 Zero graduation 0.125 0.020 Lettering SET INDEX 0.078 0.020 Shaded portion

37、 of IAS pointer As shown on Figure 5 Settable index pointer As shown on Figure 5 Note: All dimensions are in inches. 3.4.14 Black markings. USAF, classification, and MACH NO, & IAS shall be permanently and legibly marked as specified in Figure 5. These markings, all backgrounds, and all other markin

38、gs shall be finished in lusterless black, color number 37038 of FED-STD-595. 3.4.15 Dial visibility. The pointer, numerals, at least 0.063 inch of the shortest graduations, and other specified markings on the dial shall be visible from any point within the frustum of a cone, the side of which makes

39、an angle of 30o from perpendicular to the dial, where the small diameter is the aperture of the indicator case. 3.4.16 Pressure fittings. Pitot-static pressure and static pressure fittings shall be as shown on Figure 1. 3.5 Performance. 3.5.1 Airspeed and mach number equations. Airspeed equations, m

40、ach number equations, and the relationship between pressure and altitude shall be in accordance with NASA Technical Note D822. 3.5.2 MAEAS pointer adjustment. The MAEAS shall be adjustable by an adjustment on the Provided by IHSNot for ResaleNo reproduction or networking permitted without license fr

41、om IHS-,-,-MIL-PRF-27197E 7 back of the indicator (see Figure 1). The MAEAS pointer adjustment shall be protected by a cover. The cover shall be removable without the use of special tools. 3.5.3 Concentricity of pointers. The MAEAS pointer and the IAS pointer shall be concentric within 0.010 inch to

42、tal indicator reading (TTR). The MAEAS pointer shall be nearest the dial. 3.5.4 Indicator range. The indicator shall operate over an IAS range of 80 to 850 knots and at mach number ranges of 0.50 to 2.2 at altitudes of -1,000 to 80,000 feet. 3.5.5 System safety. The indicator shall present no danger

43、 of minor injury to operating and service personnel or minor damage to the weapon system. 3.5.6 IAS range of indication. The IAS pointer movement shall be limited by stops. The pointer shall rotate no more than 355o clockwise from 0o when the indicator is subjected to overpressure. 3.5.7 Magnetic ef

44、fect. The indicator shall not cause a free compass to deflect more than 1o when revolved about a short bar magnetic compass with a field intensity of 0.17 to 0.19 oersted. 3.5.8 Seal. 3.5.8.1 Case leakage. Case leakage shall be no more than 0.01 inch Hg per minute when mounted in an instrument panel

45、 or mock-up panel. 3.5.8.2 Low temperature case leakage. The case leakage shall be no more than 0.025 inch Hg per minute at -31oF. 3.5.8.3 Static pressure. The static pressure of the case shall change no more than 0.15 inch of Hg. 3.5.9 Weight. The weight of the indicator shall be 2.5 pounds or less

46、. 3.5.10 Damping. The time for the indicator to change indication from full scale to 90 knots shall be greater than 0.8 seconds and less than 2.0 seconds. 3.5.11 Seasoning. The AVU-8B/A and ME-4 shall withstand 250 hours of pressure cycling at a rate of 4 cycles per hour. The AVU-8C/A shall withstan

47、d 1,000 hours of pressure cycling at a rate of 4 cycles per hour. 3.5.12 Scale error. The IAS, mach number, and MAEAS scale errors shall be within the tolerances in Tables II, III, and IV. 3.5.13 Friction error. 3.5.13.1 IAS friction error. The IAS friction error shall be less than 3 knots for airsp

48、eeds less than 200 knots and less than 5 knots for airspeeds greater than 20 knots. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-27197E 8 3.5.13.2 MAEAS friction error. The MAEAS friction error shall be less than 10 knots. 3.5.13.3 Mach nu

49、mber scale friction error. The mach number scale friction error shall be less than 5 knots. 3.5.14 Position error. 3.5.14.1 IAS position error. The IAS position error shall be less than 3 knots for airspeeds less than 200 knots and shall be less than 5 knots for airspeeds greater than 200 knots. 3.5.14.2 MAEAS position error. The MAEAS position error shall be less than 10 k