1、AMSC N/A FSC 6610 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. MIL-PRF-83419E 11 March 2011 SUPERSEDING MIL-PRF-83419D 19 March 2008 PERFORMANCE SPECIFICATION ALTIMETER, SERVO CONTROLLED, AUTOMATIC PRESSURE STANDBY INCH-POUND Comments, suggestions, or questions o
2、n 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 databa
3、se at https:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-83419E 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 inte
4、grally-lighted altimeters that have an electromechanically servo driven pointer and a digital display of corrected altitude. The altimeters operate in the normal mode to display altitude transmitted by altitude computers or central air data computers. The altimeters incorporate an integral pressure
5、sensor with electronic outputs to aid operation in the normal mode and to provide altitude inputs for the electronic display of pressure altitude when operated in the standby mode. The altimeters also incorporate an electrical output of barometric pressure setting which is required by some aircraft.
6、 A method is provided on the bezel of the altimeter for the selection of barometric setting to be displayed in either inches of mercury (in. hg) or millibars (mb). The altimeters are designed to operate from the following power sources: 115V, 400Hz (primary), 28V DC (secondary), and 18V DC (battery
7、mode) from an optional rear mounted battery module. Altimeters meeting the requirements of this specification are interchangeable with AAU-19/A, AAU-19A/A, and AAU-19B/A, AAU-34/A, and AAU-37/A Altimeters. 1.2 Classification. Altimeters covered by this specification will be of the following types, a
8、s specified (see 6.2). AAU-34B/A Altimeter - Integrally lighted, “aviation red“ and “blue filtered“ white lighting. AAU-34C/A Altimeter - (Type AAU-34B/A Altimeter with integral lighting modified to provide night vision system (Type I, Class A, NVIS Green A) compatible lighting and “blue filtered“ w
9、hite lighting). 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed 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
10、every effort has been made to ensure the completeness of these lists, document 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
11、, 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. FEDERAL STANDARDS FED-STD-H28/2 - Screw-Thread Standards for
12、Federal Services Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-83419E 3 Section 2, Unified Inch Screw Threads- UN and UNR Thread Forms FED-STD-595/37038 - Black Lusterless FED-STD-595/37925 - White, Lusterless DEPARTMENT OF DEFENSE SPECIFIC
13、ATIONS MIL-DTL-5541 - Chemical Conversion Coatings on Aluminum and Aluminum Alloys MIL-A-8625 - Anodic Coatings for Aluminum and Aluminum Alloys MIL-C-14806 - Coating, Reflection Reducing, for Instrument Cover Glasses and Lighting Wedges MIL-L-25467 - Lighting, Integral, Red, Aircraft Instrument, Ge
14、neral Specification for MIL-L-27160 - Lighting, Instrument, Integral, White, General Specification for MIL-PRF-38534 - Hybrid Microcircuits, General Specification for MIL-PRF-38535 - Integrated Circuits (Microcircuits) Manufacturing, General Specification for MIL-DTL-83488 - Coating, Aluminum, High
15、Purity MIL-DTL-83723 - Connectors, Electrical, (Circular, Environment Resisting), Receptacles and Plugs, General Specification for MIL-L-85762 - Lighting, Aircraft, Interior, Night Vision Imaging System (NVIS) Compatible DEPARTMENT OF DEFENSE STANDARDS MIL-STD-130 - Identification Marking of U.S. Mi
16、litary Property MIL-STD-461 - Requirements for the Control of Electromagnetic Interference Characteristics of Subsystems and Equipment MIL-STD-464 - Electromagnetic Environmental Effects Requirements for Systems MIL-STD-704 - Aircraft Electric Power Characteristics MIL-STD-810 - Environmental Engine
17、ering Considerations and Laboratory Tests MIL-STD-859 - Standard Calibration Table for Aeronautical Pressure Measuring Equipment MIL-STD-865 - Selective Brush Plating, Electro-Deposition MIL-STD-882 - System Safety MIL-STD-889 - Dissimilar Metals MIL-STD-1916 - DoD Preferred Methods for Acceptance o
18、f Product MS24266 - Connectors, Plug, Electrical, Straight, Miniature, Classes E, F, G and R Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-83419E 4 MS28105 - Cover Glass, Aircraft Instrument Dial MS33556 - Housing, Indicator MS33558 - Numer
19、als and Letters, Aircraft Instrument Dial, Standard Form of DEPARTMENT OF DEFENSE HANDBOOKS MIL-HDBK-454 - General Guidelines for Electronic Equipment MIL-HDBK-470 - Designing and Developing Maintainable Products and Systems, Volume I MIL-HDBK-781 - Reliability Test Methods, Plans, and Environments
20、for Engineering Development, Qualification, and Production MIL-HDBK-831 - Preparation of Test Reports MIL-HDBK-5400 - Electronic Equipment, Aerospace, General Specification for (Copies of these documents are available online at https:/assist.daps.dla.mil/quicksearch/ or from the Standardization Docu
21、ment Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, 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, t
22、he issues of these documents are those cited in the solicitation or contract. DEFENSE ELECTRONICS SUPPLY CENTER 86098-16-D-05 - DESC Drawing, Connectors, Electrical Unshrouded Headers (Defense Electronics Supply Ctr., OH) (Copies of this document are available from Defense Logistics Agency, 8000 Jef
23、ferson Davis Hwy, Richmond VA, 23297) 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 OF MECHANICAL ENGINE
24、ERS (ASME) ASME-Y14.100 - Engineering Drawing and Related Documentation Practices (ASME documents may be obtained online at http:/www.asme.org/ or from ASME International, Three Park Avenue, New York, New York 10016-5990, USA.) Provided by IHSNot for ResaleNo reproduction or networking permitted wit
25、hout license from IHS-,-,-MIL-PRF-83419E 5 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM-B339 - Pig Tin ASTM-B545 - Tin, Electrodeposited Coatings of (ASTM documents may be obtained online at http:/www.astm.org or from American Society for Testing and Materials, 100 Barr Harbor Drive, West
26、Conshohocken, PA 19428-2959.) SOCIETY OF AUTOMOTIVE ENGINEERS (SAE) 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.
27、Unless otherwise 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 be
28、en obtained. 3. REQUIREMENTS 3.1 Qualification. This specification defines the design, performance, and test requirements for an AAU-34B/A Altimeter with automatic pressure standby. This specification also provides for a similar design Altimeter AAU-34C/A which incorporates (NVIS Green A) night visi
29、on compatible integral lighting and “blue filtered“ white lighting. This specification makes provision for qualification testing of the altimeter with its optional battery module. Altimeters furnished under this specification shall be products that are authorized by the qualifying activity for listi
30、ng on the applicable qualified products list before contract award (see 4.4 and 6.4). Battery modules shall meet the applicable requirements of this specification. 3.2 Nonstandard parts. Standard MS and AN parts shall be used where they suit the purpose. When no standard part is available, a nonstan
31、dard part may be used with prior approval of the procuring activity. When dual sources for parts or components are not available, prior approval of the procuring activity is required for use of sole source items. 3.3 Microelectronic Devices. Microelectronic devices shall meet the requirements of MIL
32、-PRF-38535 (monolithic) and MIL-PRF-38534 (hybrid) and be listed on the associated Qualified Manufacturers Listing (QML). 3.4 Materials. 3.4.1 Nonmagnetic materials. Nonmagnetic materials shall be used for all parts of the altimeter, except where magnetic materials are essential. The extent to which
33、 magnetic materials are required shall be reported to the procuring activity. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-83419E 6 3.4.2 Toxic and corrosive fumes. Materials, as installed in the altimeter and under the service conditions
34、specified herein, shall not liberate deleterious or corrosive fumes. This shall include any fungicidal agents that are used. 3.4.3 Protective treatment. When materials which are used in the construction of the altimeter are subject to deterioration when exposed to climatic and environmental conditio
35、ns likely to occur during service usage, they shall be protected against such deterioration in a manner that will in no way prevent compliance with the performance requirements of the specification. The use of any protective coating that will crack, chip, or scale with age or extremes of climatic or
36、 environmental conditions shall be avoided. 3.4.4 Fungus-proof materials. Materials that are nutrients for fungi shall not be used where it is practical to avoid them. Where used and not hermetically sealed, they shall be treated with a fungicidal agent acceptable to the procuring activity. However,
37、 if they are used in a hermetically sealed enclosure, fungicidal treatment will not be necessary. 3.4.5 Metals. Metals shall be of the corrosion-resistant type, unless suitably protected to resist corrosion during normal service life. 3.4.5.1 Dissimilar metals. Dissimilar metals are defined in MIL-S
38、TD-889. Unless suitably protected against electrolytic corrosion by means of protective coating or hermetic sealing, intimate contact of dissimilar metals shall be avoided. 3.4.6 Nonferrous metals. Nonferrous materials shall be used for all parts of the altimeter, except where ferrous materials are
39、essential. 3.4.6.1 Protection of nonferrous materials. Nonferrous materials contained within hermetically sealed enclosures shall be considered suitably protected from corrosion. Requirements specified for fungicidal and corrosion protective treatment and anodizing of aluminum alloy parts will not b
40、e applicable for parts within hermetically sealed enclosures. 3.4.7 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the operational an
41、d maintenance requirements, and promotes economically advantageous life cycle costs. 3.4.8 Cementing Materials. Cases, components, or parts shall not be entirely dependent upon cements, epoxies or related materials to maintain integrity for the service life of the altimeter. 3.5 Design and Construct
42、ion. 3.5.1 Case. The case shall consist of a body with a flange and a bezel, referencing MS33556 for guidance, except as shown in FIGURE 1. The back of the case shall provide for the mounting of a replaceable battery module and its electrical interface connection to the module. The electrical recept
43、acle for the battery module on the back of the case shall be Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-83419E 7 provided with a cover that can be readily removed for installation of a battery module as required for some applications. Op
44、eration and performance of the altimeter with 115V, 400Hz and/or 28V DC electrical powers shall not be affected by operation of altimeters without a battery module installed or the failure of an installed battery module on battery-equipped altimeters. Battery-related BIT test and arming displays of
45、the altimeter shall be inhibited when a module is not mounted on the altimeter. The altimeter outline dimensions and the external connections of the altimeter shall conform to FIGURE 1. 3.5.1.1 Body (altimeter). Unless otherwise approved by the procuring activity, the case body and mounting flange s
46、hall be made of lightweight, non-magnetic metal, uniform in texture and have a smooth surface with a durable black finish. The mounting flange of the body shall have a durable lusterless finish, Color No. 37038 of FED-STD-595. The rear surfaces of the two upper mounting flanges and the region identi
47、fied on FIGURE 1 shall be free of paint and shall be tin plated in accordance with either ASTM-B545 or ASTM-B339, referencing MIL-STD-865 for guidance, to allow electrical grounding to the aircraft instrument panel and to comply with MIL-STD-464 requirements. The surface area on the back of the case
48、 as shown in FIGURE 1 shall also be plated to provide for electrical bonding of the altimeter to a battery module. 3.5.1.2 Bezel. The bezel of the case shall be made of nonferrous low-density metal and shall have a durable lusterless black finish, Color No. 37038 of FED-STD-595. The bezel shall be h
49、eld in place by means of screws properly secured by lock washers or similar devices of a design approved by the procuring agency. 3.5.2 Cover glass, lighting wedge and displays. The cover glass shall conform to MS28105 and shall not interfere with the readability of the instrument. The glass shall be properly sealed and direct metal contact with the glass that could result in damage during service use shall not
