1、5 December 1984 SUPERSEDING P MIL-A-81605C(AS) / 24 October 1974 ,/“ MILITARY SPECIFICATION ALTIMETER SET, ELECTRONIC AN/APN194( V) This specification is approved for use by the Naval Air Systems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Departm
2、ent of Defense. l. SCOPE 1.1 Scope. This specification establishes the design performance and acceptance requirements for the AN/APN-l94(v) Electronic Altimeter Set , herein referred to as the equipment. The equipment covered by this specification shall provide an accurate indication of absolute alt
3、itude of an aircraft at an altitude range of O to 5,000 feet over land and water. Altitude warnings are provided when the aircraft is at or below certain fixed or variable altitudes. I * 1.2 Classification. The equipment covered by this specification consists of the following I-tems: I tem Type Desi
4、gnation Receiver-Transmitter Recei ver-Transmi tter Indicator, Height Indi cator , Height Indi cator , Height Indicator, Height Indicator, Height Indicator, Height * Blanker, Interference Antenna Antenna Antenna Antenna 3, RT-1015A/APN-194( V) RT-1042A/APN-194( V) : ID-1760B/APN-194 V ID-1768B/APN-1
5、94 u V ID-1811A/APN-194( V) ID-1879A/APN-194( V) ID-1880A/APN-194( V) ID-2206/APN-194( V) MX-9132A/APN-194( V) AS-2595/APN-194( V) AS-2728/APN-194 V AS-2741/APN-b94 11 V AS-2742/APN-194( V) 1.3 Associated equipment. This equipment should operate with the associated equipment listed in 6.9. Beneficia
6、l comments (recommendations, additions, deletions) and any per- tinent data which may be of use in improving this document, should be addressed to: Commanding Officer, Naval Air Engineering Specifications and St.andards Department (ESSD) Code 93, Lakehurst, NJ 08733, by using the self addressed Stan
7、dardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. FSC 5826 K THIS DOCUMENT CONTAINS .“sa- PAGES Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2, APPLICABLE DOCUMENTS 2,l Government document
8、s. 2.1.1 Specifications and standards. Unless otherwise specified (see 6.2), the following specifications and standards of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (DoDISS) specified in the solicitation, form a part of this specification to th
9、e extent specified herein. SPECIFICATIONS FEDERAL QQ-S-571 Solder; Tin Alloy; Lead-Tin Alloy; and Lead Al lay MILITARY- Mil-G-174 MIL-W-5088 MIL -E -5400 MIL-T-5422 MIL-P-7788 MIL-“7793 MIL-F-14256: MIL-C-14806 MIL-E-17555 MIL-T-18303 MIL-N-18307 MIL-A-23887 M IL -R -2401 1 G?ass I Optical Wiring; A
10、ircraft, InstaTtation of Electronic Equipment, Aircraft, General Specification for Testing, Environmental, Aircraft Electronic Equipment Panels, Information, IntegraTly Illuminated Meter , Time Tot al izi ng FTux, Solderin.g, Liqu.id (Rosin Base) Coating, Reflection Reducing, for Cover GTasses and L
11、ighting Wedges Electronic and Electrical Equipment and Associated Repair Parts, Preparation for Del i very of Test Procedures; Preproduction and Acceptance for Aircraft Electronic Equipment, Format for Nomencl ature and Namepl ates for Aeronautical Electronic and Associated Equipment Altimeter Set,
12、Electronic AN/APN-141( V) Radar Altimeter Warning Set AN/APQ-107 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-r MIL-C-25050 Colors, Aeronautical Lights and Lighting Equipment, General Requirements for MIL-L-25467 Lighting, Integral , Instrument,
13、 General Specifi- cation for MIL-L-27160 Lighting, Instrument , Integral, White, General Specification for MIL-M-38510/104 Microcircuits y Linear y Line Drivers and Recei vers , Mono1 it hi c Si 1 i cone MIL-C-39012 Connectors, Coaxial, Radio Frequency, General Specification for NAVAL AIR SYSTEMS CO
14、MMAND MIL-STD-2084 STANDARDS FE DE RAL FED-STD-595 MILITARY MIL-STD-454 MIL-STD-461 MIL-STD-462 MIL-STD-463 MIL-STD-704 MIL-STD-781 MIL-STD-785 MIL-STD-794 Maintainability of Avionics Equipment and Systems, General Requirements for Col or Standard General Requirements for Electronic Equipment Electr
15、omagnetic Interference Characteristics, Requirements for Equipment Electromagnetic Interference Characteristics, Measurement of Definitions and Systems of Units, Electromagnetic Interference Technology Electric Power, Aircraft, Characteristics and Uti 1 ization of Re1 i abi 1 i ty Design Qual if i c
16、at i on and Producti on Acceptance Tests: Exponential Distribution Re1 iabi 1 ity Progran for System and Equipment Development and Production Parts and Equipment , Procedures for Packaging and Packing of 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-
17、,-,-MIL-A-81605D( AS) MIL-STD-810 Environmental Test Methods MIL-STD-965 Parts Control Program MIL-STO-2074 Failure Classification for Reliability Testing MIL-STO-2076 Unit Under Test Compatability with Automatic Test Equipment, General Requirement for MIL-STD-2077 Test Program Set, General Requirem
18、ent for MIL-STO-2084 Maintainabi 1 ity of Avionics Equipment and Systems. General Requirements for MS33.3.3 MS3 7322 MS25237 MS25271 MS27478 MS33558 Connector, Receptacle, Electric Box Mounting, Min i ature Meter, Time Totalizing, 115 Volt, 400-Cycle, Rev, B Lamp, Incandescent, Single Contact, Midge
19、t F1 anged Base Relay, 10 amp, 4 PDT, Type I , Hermetically Sealed, Solder Hook Connector, Receptacle, Electric, Solder Type, Solder Mounting, Hermetic Seal, Pins, Bayonet Coup1 ing Series I IA Numerals and Letters, Aircraft Instrument Dial , Standard Form of 2.1.2 Other Government documents, drawin
20、gs, and publications. The following other Government documents form a part of this specification to the extent specified herein. PUBLICATIONS NAVAL AIR SYSTEMS COMMAND EI-566 ET- 566 Avionics Installation Instructions for Altimeter Set, Electronic AN/APN-l94(V) Avionics Bench, Preflight and Flight T
21、est Instructions for Altimeter Set, Electronic AN/APN-194(V) (Copies of specifications and standards required by manufacturers in connection with specific acquisition functions should be obtained upon application from the Commanding Officer, Publications and Forms Center, Code 305, 5801 Tabor Avenue
22、, Philadelphia, Pennsylvania 19120.) 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-81b05D 58 m 777770b 0171337 b m . 3. REQUIREMENTS * 3.1 First article. When specified, a sample(s) shall be subjected to first article inspection (see 4.2 an
23、d 6.3). 3.2 Parts and materials. In the selection of parts and materials, fulfillment of major desiqn objectives shall be the prime consideration. In so doing, the following shall govern: a. Microelectronic technology shall be considered and microelec- tronic items shall conform to requirements spec
24、ified herein. b. Other parts and materials requirements shall conform to MIL-E- 5400. c. Nonrepairable subassembl ies shall be used in accordance with MIL-STD-2084 and as specified in MIL-E-5400. d. When previously produced models of this equipment did not use nonrepairable subassemblies, the design
25、 shall not be changed to employ nonrepairable assemblies without the approval of the procuring activity. * 3.2.1 Nonstandard parts and materials approval. Approval for the use of nonstandard parts and materials (including electron tubes, transis- tors and diodes) other than microelectronic devices s
26、hall be obtained as specified in MIL-E-5400. Microelectronic devices shall be approved as specified in MILSTD965, Procedure I. * 3.2.2 Microelectronic modular assemblies. When used, Microelec- tronic Modular Assemblies shall meet the requirements of MIL-STD-965. Conformal coat i ngs , encapsul ants
27、, embedments or potti ng materi al s used with modular assemblies containing integrated circuits and discrete parts shall be easily removable without damage to the assembly. 3.2.3 Modules. The electronic portions of the equipment shall be functionally modularized in accordance with MIL-STD-2084. 3.3
28、 Design and construction. The equipment shall conform with all the applicable requirements of MIL-E-5400 for design, construction and workmanship, except as otherwise specified herein. * 3.3.1 Total Wei ht. The total weight of the AN/APN-l94(V) Elec- tronic Altimdcluding cables, shall be not greater
29、 than 6.8 pounds. This weight is predicated upon an Electronic Altimeter Set con- sisting of one Receiver-Transmitter, one Height Indicator, and two Antennas. For those Systems requ7ring an Interference Blanker, the total system weight shall be not greater than 8.55 pounds. The ID-2206/APN-l94(V)- h
30、eight indicator will, if used, increase the above weights by 0.8 pounds per indicator. See EI-566 for typical unit weights. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-81605D( AS) 3.3.2 Reliability. The contractor shall conduct a reliabil
31、ity program using MIL-STD-785 as a guide. On a reorder from a supplier who has previously produced the equipment, the program previously used may be continued unless otherwise specified in the contract (see 6.2.1). 3.3.2.1 Operational stability, The equipment shall operate with prescribed performanc
32、e, continuously or intermittently for a period of at least 5000 hours without the necessity for readjustment of any controls which are inaccessible to the operator during normal use. * 3.3.2.2 Operating Life. The equipment shall have a total operating 1ifG of 10,000 hours with minimal servicing and
33、replacement of parts. (see 6.2.2) . shall have 1500 hours of mean (operating) time between failures when tested and accepted as specified in 4.4.2. Allocation of MTBF for each item of the system shall be in accordance with 3.5.1.13, 3.5.2.18, 3.5.3.10 and 3.5.4.7. * 3.3.2.3 Reliability in mean time
34、between failure (MTBF), The system * 3.3.2.4 Time totalizing meter. The following units shall contain a 10,000-hour time totalizing meter in accordance with MIL-“7793. Unit RT-1015A/APN-194( V) RT-1042A/APN-194( V) Type of Meter M7793 M7793 3.3.3 Cabling and connections 3.3.3.1 Cab1 es and connector
35、s. The equipment shall provide for the use of cables and connectors in accordance with MIL-E-5400. 3.3.3,2 Interconnection cabling. The equipment shall be capable of prescribed operation using external wiring in accordance with MIL-W- 5088. The external wiring shall be unshielded, except that a mini
36、mum number of the individual wires may be shielded when demonstrated as neces- sary to meet interference control requirements and provided the assembly of the cable to its plugs may be easily accomplished. External cables and that portion of the connectors attached to the cables shall not be supplie
37、d as part of the equipment. 3.3.4 Interchangeabi 1 i ty. The equipment shall meet the interchangea- bility requirements of MIL-t-S400 to the SRA/QRA level as defined by MIL-STD-2084, * 3.3.4.1 Interchangeability with AN/APN-l41(V). This equipment shall be interchangeable with the AN/APN-l41(V) (MIL-
38、A-23887) with respect to the following: (See 6.9). a. Receiver-Transmi tters RT-1015A/APN-194( V) and RT-l042A/APN- 194( V) shall be physically and electrically interchangeable with the RT- . 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-81
39、605D( AS) 601B/APN-l41(V) with the exception of electrical outputs to the Interfer- ence Blanker MX-9132A/APN-194( V) or RF Switching Unit SA-791A/APN-141( V) as applicable. b. Height Indicator ID-1760B/APN-l94(V) shall be electrically and mechanically interchangeable with Height Indicator ID-881B/A
40、PN-l41(V). c. Height Indicator ID-1768B/APN-l94(V) shall be electrically and mechanically interchangeable with Height Indicator ID-1304/APN-l41(V) except that a variable al ti tude aural warning function is added. d. Height Indicator ID-1811A/APN-l94(V) shall be electrically and mechanical ly interc
41、hangeable with Heigh Indicator ID-1015A/APN-141( V). e. Height Indicator ID-1879A/APN-l94(V) shall be electrically and mechanically interchangeable with Height Indicator ID-1687/APN-l41(V). f. Interference Blanker MX-9132A/APN-194( V) shall physically mount in the same position as RF Switching Unit,
42、 SA-791A/APN-l4l(V), g. Antennas AS-2595/APN-194( V) and AS-2728/APN-194( V) shall be electrical ly interchangeable with Antennas AS-1233/APN-141( V) and AT- 1015/APN-l41(V), except that isolation shall be 85 dB minimum at spacings of 24 inches or greater. h. Antenna AS-2741/APN-l94(V) shall- be ele
43、ctrically and mechani- cally interchangeable with Antenna AT-1015/APN-141( V) , except that iso- lation shall be 85 dB minimum at center to center spacings of 24 inches or greater. i. Antenna AS-2742/APN-l94(V) shall be electrically and mechani- cally interchangeable with Antenna AT-1233/APN-141( V
44、, except that iso- 1 ation shall be 85 dB minimum at center to center spacings of 24 inches or greater. j . External wiring and connectors for the AN/APN-141( V) shall be utilized without change to the extent required by the AN/APN-194( V) to achieve proper system operation and interface with other
45、equipments. An installation kit is required for those Aircraft which presently have the AN/APN-l41(V) Altimeter set installed. (See EI-566.) 3.3.5 Interference ControT. The generation of radio interference by the equipment and the vulnerability of the equipment to radio interfer- ence shall meet the
46、 requirements of MIL-STD-461, MIL-STD-462, and MIL- STD-463 and as delineated herein. The upper frequency limit of test RS03 of MIL-STD-461 shall be extended from IO to 20 GHz. The generation of interference during the operation of mechanical switch contacts in the Height Indicators is exempt from t
47、his requirement. 3.3.5.1 Conducted susceptibility and emissions, antenna terminal. The receiver Derformance reuuirements shall be met with the RF sianals listed in Tabie I injected at the antenna input terminal individually .J .- 7 Provided by IHSNot for ResaleNo reproduction or networking permitted
48、 without license from IHS-,-,-and collectively. Signals at the fundamental or necessary sidebands of the receiver are exempted. At each corresponding frequency, the trans- mitter peak power RF output shall be not greater than the levels shown in Table I. The power levels at the fundamental frequency
49、 and necessary sidebands shall be measured but are exempt from this requirement during the time period of intentional RF transmission. The levels shown in Table J supplement the requirements of MIL-STD-461. For frequency ranges and levels not shown, the requirements of MIL-STD-461 shall apply. TABLE I. Conducted susceptibility and emissions limits. Freq. (MHz) Recei ver 200 - 400 + 3 dBm (peak) 1000 - 1200 +21 dBm (peak) 2100 - 2200 +20 dBm (pea
