1、 Comments, suggestions, or questions on this document should be addressed to: Oklahoma City Air Logistics Center/ENSDAA, 3001 Staff Drive, Suite 1AC-82A, Tinker AFB, OK 73145-3036 or emailed to af71tinker.af.mil. Since contact information can change you may want to verify the currency of this addres
2、s using the ASSIST database at http:/assist.daps.dla.mil. AMSC N/A FSC 6605 INCH-POUND MIL-PRF-38214D 23 June 2008 SUPERSEDING MIL-PRF-38214C 02 August 2001 PERFORMANCE SPECIFICATION COMPASS, MAGNETIC, MOUNTED Provided by IHSNot for ResaleNo reproduction or networking permitted without license from
3、IHS-,-,-MIL-PRF-38214D 2 This specification is approved for use by the Department of the Air Force and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the requirements for four types of integrally-lighted, flange-mounte
4、d, pilots standby magnetic compasses (see 6.4.7). 1.2 Classification. Compasses shall be of the following types, as specified (see 6.2): Type Reference Number Description Type I Dual Lamp, low voltage AQU-3/A White light. AQU-5/A Red light. AQU-14/A White light, (4.5VDC). Type II Dual Lamp, normal v
5、oltage MS17983-4/Y Yellow Markings / Red Light. MS17983-4 White Markings / Red Light. Type III NVIS Green High Intensity Lighting. AQU-3/AN5 NVIS Green light (low voltage). AQU-3/AN24 NVIS Green light (normal voltage). Type IV Special Applications 160J18047 A-10 Aircraft, NVIS Green, High Vibration.
6、 AQU-3A/SJP AH-64D Longbow Apache, High Vibration 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this specification. These lists do not include documents cited in other sections of this specification or recommended for additional inf
7、ormation or as examples. While every effort has been made to ensure the completeness of these lists, document users are cautioned that they must meet the requirements specified in the documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed. 2.2 Government documen
8、ts. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks 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. Provided by IHSNot for Re
9、saleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-38214D 3 DEPARTMENT OF DEFENSE SPECIFICATION AN3116 - Plug Assembly, Instrument Electrical MIL-L-25467 - Lighting, Integral, Red, Aircraft Instrument, General Specification For MIL-L-85762 - Lighting, Aircraft, Interior
10、, Night Vision Imaging System (NVIS) Compatible DEPARTMENT OF DEFENSE STANDARDS FED-STD-595/37038 - Black, Lusterless FED-STD-595/37875 - White, Lusterless (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or from the Standardization Documents Order Desk, 700
11、Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 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 NATIONA
12、L STANDARDS INSTITUTE/AMERICAN SOCIETY FOR QUALITY (ANSI/ASQ) ANSI/ASQ Z1.4 - Sampling Procedures and Tables for Inspection by Attributes (DoD-adopted) (ANSI documents may be obtained at www.ansi.org or from American National Standards Institute, 25 West 43rd Street, New York, NY 10036.) AMERICAN SO
13、CIETY FOR TESTING AND MATERIALS (ASTM) ASTM B117 - Standard Practice for Operating Salt Spray (Fog) Apparatus (DoD-adopted) (ASTM documents may be obtained at www.astm.org or addressed to the American Society for Testing and Material, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) NORTHRO
14、P GRUMMAN CORPORATION SA220R0307 - Final Report, A-10A Shock, Vibration and Acoustics Qualification Procedures for Aircraft Equipment Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-38214D 4 ES220S0013 - Product Function Specification, Integr
15、ally Illuminated Information Panels, NVIS Compatible. (Northrop Grumman Corporation documents may be obtained at http:/ or addressed to Northrop Grumman Corporation Military Aircraft Systems Division, 600 Grumman Way West, Bethpage, N.Y. 11714.) MACAIR 91B0445 - General Requirements for T-45A Crew S
16、tation Instrumentation Integral Illumination LL0060-200 - AH-64D Vibration Requirements (MACAIR documents may be obtained at http:/ or addressed to Boeing Technical Library at 325 McDonnell Blvd #110, Hazelwood MO 63042.) RADIO TECHNICAL COMMISSION FOR AERONAUTICS (RTCA) RTCA/DO-160 - Environmental
17、Conditions and Test Procedures for Airborne Equipment (RTCA documents may be obtained at www.rtca.org or addressed to RTCA Inc., 1828 L Street, NW, Suite 805, Washington, DC 20036.) 2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein
18、(except for related specification sheets), 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. REQUIREMENTS 3.1 Qualification. The compasses furnished under this specification shal
19、l be products that are manufactured by a manufacturer authorized by the qualifying activity for listing on the applicable Qualified Products List (QPL) before contract award (see 4.2 and 6.3). Qualification for one type of compass shall neither preclude nor include qualification for the other types
20、of compasses. 3.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that the materials meet or exceed the operational and maintenance requirements, and promote economically
21、 advantageous life cycle cost. 3.3 Materials. All materials shall be suitably treated to resist corrosion due to electrolytic decomposition, fungus, salt fog, and any other atmospheric condition that may be encountered Provided by IHSNot for ResaleNo reproduction or networking permitted without lice
22、nse from IHS-,-,-MIL-PRF-38214D 5 during operational use or storage. Non-magnetic materials shall be used to the maximum extent possible. The use of toxic chemicals, hazardous substances, or ozone depleting chemicals shall be avoided, whenever feasible. 3.3.1 Plastic. No part of the compass case or
23、internal assembly shall be made of plastic. 3.4 Interface. 3.4.1 Dimensions. The compass shall dimensionally conform to the envelope drawing in figure 2. 3.4.2 Mounting flange. The mounting flange shall be an integral part of the compass. 3.4.3 Field of vision. The face of the compass shall be visib
24、le from any point within the frustum of a cone, the side of which makes an angle of 30 from a perpendicular to the dial, where the small diameter is the aperture of the compass case and is centered on the lubber line. 3.4.4 Electrical connector. The compass shall use an electrical connector that fit
25、s the plug assembly in AN3116-2 and conforms to the external configuration shown in figure 3. 3.4.5 Color. 3.4.5.1 Visible surfaces. Unless otherwise specified (see 6.2), all visible surfaces of the compass shall be lusterless black, color number 37038 of FED-STD-595. 3.4.5.2 Lettering. Unless other
26、wise specified (see 6.2), all lettering on the compass shall be lusterless white, color number 37875 of FED-STD-595. MS17983-4/Y compass lettering shall utilize United Mineral & Chemical Corp UV Florescence Pigment (GBF-OR) coloring in lieu of the lusterless white. 3.4.6 Reflecting surfaces. Unless
27、contacting the filling liquid, all reflecting glass surfaces shall be treated with a Broad Band Anti-Reflective Visible Light coating (BBAR-VIS). 3.4.6.1 Coated area. The optical elements shall be coated over their entire effective aperture except for a 0.030 inch maximum uncoated edge holding area.
28、 3.4.6.2 Specular reflectance. When applied to the substrate materials having indices of refraction within the range of 1.47 1.55, the specular reflectance from each coated surface shall not exceed 0.6 %Abs. for angles of incidence from 0 to 15 degrees utilizing a 440 to 660 nanometer light source.
29、3.4.6.3 Light loss. Within the wavelength range of 425 to 700 nanometers, light loss (absorbance plus diffuse reflectance) in the coating shall not exceed a maximum average loss of 0.5% and a maximum absolute loss of 2.0%. Provided by IHSNot for ResaleNo reproduction or networking permitted without
30、license from IHS-,-,-MIL-PRF-38214D 6 3.4.6.4 Coating quality. The coating shall be uniform in quality and condition, clean, smooth, and free from foreign materials, and physical imperfections (flaking, peeling, blistering, blemishes, discolorations, stains, smears, and streaks) nor show evidences o
31、f a cloudy or hazy appearance. 3.4.6.5 Abrasion resistance. There shall be no visible damage to the coated surface when rubbed with a Standard # 2 pencil eraser with a force of 2 pounds. 3.4.7 Visibility. The filling liquid shall not obscure the card from the user (see 6.4.2). 3.4.8 Electrical power
32、. 3.4.8.1 Type I & AQU-3A/SJP Compasses shall be powered by 5VDC unless otherwise specified. 3.4.8.2 Type II Compasses shall be exclusively powered by 24VDC. 3.4.8.3 Type III Compasses shall be powered by either 5VDC or 24VDC as specified in 3.5.5.5. 3.5 Performance. 3.5.1 Reliability. The compass s
33、hall have a mean time between failures (MTBF) of at least 3,000 flight hours with a discrimination ratio of 2 and a confidence factor of 0.9. 3.5.2 Operational life. The compass shall have an operational life of at least 5 years. 3.5.3 Operation. When properly installed in the aircraft, the compass
34、shall continuously indicate the heading of the aircraft with reference to the magnetic field of the earth. 3.5.4 Weight. The compass shall weigh no more than 14 ounces. 3.5.5 Lighting. The compass shall incorporate an integral lighting system. The lighting system shall permit replacement of incandes
35、cent bulbs or the lighting assembly. 3.5.5.1. Lamp location. Lamps shall be accessible from the front (dial side) of the instrument case. 3.5.5.2. Lamp life. The lighting system lamps shall be designed for a life of 1,000 operating hours. 3.5.5.3 AQU-3/A & AQU-3A/SJP (white light). The compass shall
36、 incorporate an integral white lighting system using incandescent lamps or light emitting diodes (LED) as a light source. 3.5.5.3.1 Color. The color of the white portions of the indicator with a 4.5 0.050VDC power applied to the lighting terminals shall have a chromaticity coordinates of x = 0.4400.
37、020 and y = 0.4050.020. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-38214D 7 3.5.5.3.2 Brightness. When a 4.5 0.050VDC power applied to the lighting terminals, the light intensity and distribution shall be as follows: a. White areas. 1.00
38、 0.50 foot-lamberts. The average of all reading taken in the white areas shall be 1.000.30 foot-lamberts. b. Black areas. 0.050.03 foot-lamberts when reflected light (wedge and ring lighting) is used and 0.040.02 foot-lamberts for refracted light (back lighting). c. Pointer and lubber lines. 1.20 0.
39、50 foot-lamberts. The average brightness of all the pointer readings shall be 0.10 to 0.50 foot-lamberts higher than the average brightness of the dial white areas. 3.5.5.3.3 Stray light. The lighting system shall be so housed as to prevent the leakage of stray light and to shield the lamp filaments
40、 from direct view. 3.5.5.3.4 Light leakage. The lighting system shall in no way restrict the visibility of any graduations, numerals, pointers, or other specified markings. 3.5.5.3.5 Contrast. Contrast between the white and black portions of the indicator scale shall be 12 or greater. Contrast, C, i
41、s defined as: C= B2-B1/B1 Where: B2 is the brightness of the white, and B1 is the brightness of the black portion of the instrument scale. 3.5.5.4 AQU-5/A, MS17983-4 AND MS17983-4/Y (red light). These compasses shall incorporate an integral red lighting system as specified in MIL-L-25467. 3.5.5.5 Ty
42、pe III NVIS Green High Intensity Lighting. The compass shall incorporate an integral, NVIS-compatible, green lighting system as specified in MIL-L-85762. AQU-3/AN5 (low voltage) shall operate at a nominal voltage of 5VDC. AQU-3/AN24 (normal voltage) shall operate at a nominal voltage of 24VDC. 3.5.5
43、.6. 160J18047 (NVIS Green). This is a special application compass design tailored specifically for the A-10 aircraft. The compass shall incorporate an integral, NVIS-compatible, green lighting system as specified in Grumman Aerospace drawing ES220S0013. This compass shall operate at a nominal voltag
44、e of 24VDC. 3.5.5.7 AQU-14/A (white light, low voltage). The compass shall incorporate an integral lighting system and operating voltage as specified in MACAIR 91B0445. 3.5.6 Compensator (see 6.8). 3.5.6.1 Adjustability. The compensators shall be manually adjustable to remove the compass deviations
45、on north-south and east-west headings. Both compensators shall be provided with a Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-38214D 8 zero index mark to show where the compensators exert zero effect during operation. The compensators sha
46、ll be adjustable from the front using a flat tip screwdriver. 3.5.6.2 Adjustment. The coupling effect between the North-South and East-West Compensators shall be no more than 2 . The change in compensation for equal angular displacements of the adjusting screws shall be the same for both North-South
47、 and East-West Compensators. Either adjustment screw may be turned continuously in one direction without meeting a stop, allowing both compensator systems to pass through the entire adjustment range continuously. 3.5.6.3 Compensation range. The compensators shall adjust the deflection of the compass
48、 by at least 32 in each direction. 3.5.6.4 Compensator cover. A cover integral to the compass shall be used to cover the compensator systems adjusting devices. 3.5.7 Mounting lugs. When mounted, the mounting lugs of the compass shall withstand 175 pounds of force to the holes of the mounting lugs for 1 minute. 3.5.8 Connector strength. The electrical connector shall withstand a torque of 25 inch-pounds. 3.5.9 Filling liquid (see 6.4). 3.5.9.1 Filler cap. The compass shall incorporate a filler cap. 3.5.9.2 Leakage. The compass shall not leak. 3.5.9.3 Seals. All gaskets and sea
