1、MIL-I-21203A bb W 7777706 0130285 b W / IAUGUST I962 SU PER SED IN G MiL-X-21203(AER) 16 DECEMBER 1957 MILITARY SPECIFICATION INDICA TOR, ATTITUDE, SPHERICAL, DIRECT READING, FAST ERECTING, ELECTRIC GYRO This specification has been approved by the Bureau of Naval Weapons, Department of the Navy. 1.
2、SCOPE 1.1 Scope - This specification covers certain design and all performance require- menta for procurement of spherical, direct reading, fast erecting, electric gyro attitude indicators in 5 by 5-1/4 inch cases. * 1.2 Classification - The Attitude indicators shall be of the following types: Type
3、I - indicators without integral lighting and without synchro Output. (MS28086 - 1) Type 11 - indicators without integral lighting and with synchro output. (MS28086- 2) Type U - indicators with integral lighting and without synchro Type IV - indicators with integral figwing and with synchro Output. (
4、MS28086- 3) Output. (MS28086 -4) 2. APPLICABLE DOCUMENTS 2.1 General - The foilowing documents, of the issue in effect on the date of the invitation for bids, formpart of this specification to the extent specified herein, SPECIFiCATiONS Federal DD-G-451 Glass, Flat and Corrugated, for Glazing, Mirro
5、rs and QQ-C-320 Chrominum Plating (Electrodeposited) QQ-N-290 Nickel Plating (Electrodeposited) QQ-P-416 Plating, Cadmium (Electrodeposited) Military MIL-P-116 Preservation, Methods of other uses MIL-C-5015 Connectors Electric, “AN“ Type IFSC 6610 1 Provided by IHSNot for ResaleNo reproduction or ne
6、tworking permitted without license from IHS-,-,-I MIL-I-23203A 66 m 7377706 0330286 B MIL-I-%1203A(WEP) MIL-E-5272 MIL-E- 5400 MIL-C-5541 MIL- N- 601 1 MIL-L-6085 MIL-1-6181 MIL-S-6872 MIL-S-7742 Mn, - M- 77 93 MIL-P-7936 MIL-A-8625 MIL-R-22973 MIL-L-25467 MIL-G-25591 MIL-D-70327 STA h?)ARDS Federal
7、 FED-STD-595 Military MIL-STD-130 MIL-STD- 143 MIL-STD- 704 MS28086 MS3 3 558 MS33586 Environmental Testing, Aeronautical and Associated Equipment, General Specification for Electronic Equipment, Aircraft, General Specification for Chemical Films for Aluminum and Aluminum Alloys Nitrogen, Liquid and
8、 Gas Lubricating Oil, Aircraft Instrument, Low Volatility Interference Control Requirements, Aircraft Equipment Soldering Process, General Specification for Screw Threads, Standard, Optimum Selected Series, General Specification for Meter, Time Totalizing Parts and Equipment, Aeronautical, Preparati
9、on for Delivery . Anodic Coatings, for Aluminum and Aluminum Alloys Reliability index Determination for Avionic Equipment Models, General Specification for Lighting, Integral, -Instrument, General Specification for Gyroscope, Rate, Switching Type MC-1 Drawings, Engineering and Associated Lists Color
10、s Identification Marking of U. S. Military Property Specifications and Standards, Order of Precedence for the selection of Electric Power, Aircraft, Characteristics and Utilization of Indicator. Attitude, Spherical, Direct Reading, Fast Erecting, Electric Gyro Numerals and Letters, Aircraft Instrume
11、nt Dial, Standard Form of Metals, Definition of Dissimilar 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2.2 - MIL-1-21203A bb M 777970b 0330287 T W MIL-1-21203A (WEP) Availability of Documents - (1) When requesting any of the applicable document
12、s, refer to both titie and number. Copies of this specification and applicable documents may be obtained upon application to the Commanding Officer, Naval Supply Depot, Code CDS, 5801 “abor Avenue, Philadelphia 20, Pennsylvania. 3. REQUIREMENTS * 3.1 Qualification - The attitude indicator furnished
13、under this specification shali be a product which has been tested, and has passed the qualification tests specified herein and has been listed on, or approved for. listing on, the applicable qualified products list. 3.2 Selection of Government Documents - Specifications and Standards for necessary c
14、ommodities and services not specified herein shall be selected in accordance with MIL-STD-143 except as provided .in 3.2.1 and 3.2.2. 3.2 1 Commercial Parts - Commercial parts having suitable properties may be used where, on the date of invitation for bids, there are not suitable standard parts in a
15、ny case, com- mercial utility parts, like screws, bolts, nuts, cotter pins, having suitable properties, may be used provided: (a) The can be replaced by the standard parts (MS or AN) without alteration. ) The corresponding standard part numbers are referenced in the parts list and if practicable, on
16、 the contractors drawings. 3.2.2 Standard Parts - With the exception of 3.2.1, MS and AN standard parts shall be used where they suit the purpose. They shall be identified on the drawings by their part numbers, 3.3 specified herein. Materials for which there are no applicable specifications, or whic
17、h are not specifically described herein, shall be of the best quality, of thelightest practicable weight and suitable for the purpose intended, Materials - Materials shall conform to applicable specifications and shaU be as 3.3.1 Critical Materials - Noncritical materials shall be used where practic
18、able. Where the use of a critical material is essential to meet specification requirements, the material used shall be the least critical of those which are adequate for the purpose. protected as specifiedein to resist corrosion due to fuels, salt spray or atmospheric conditions to which the instrum
19、ent may be subject when in storage or during normal service life. 3.3. 2 Metals - Metals shall be of the corrosion resistant type, or shall be suitably 3.3.2.1 Dissimilar Metals - Dissimilar metals as defined in MS33586 shall not be used in intimate contact with each other, unless suitably protected
20、 against electrolytic corrosion by means of protective coatings or hermetic sealing. 3.3.3 Non-magnetic Materials - Non-magnetic materials shall be used for all parts of the instrument except where magnetic materials are essential, 3.3.4 huigus-Proof Materials - Materials which are nutrients for fim
21、gi shail not be used where it is practicable to avoid them, Where used and not hermetically sealed, they shail be treated with a fungicidal agent acceptable to the procuring activity. if used in a hermetically sealed case, fungicidal treatment will not be necessary. 3 .- it Provided by IHSNot for Re
22、saleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-23203A bb W 77777Ob 0330288 3 W MIL-I-21203A (WEP) 3.3.5 Corrosive Fumes - Materials used in the interior construction of the instrument shall not produce corrosive or deleterious fumes. 3.4 Design and Construction - The
23、indicator shall be designed to indicate the attitude of an airplane throughout all maneuvers and to permit loops and rolls. to be made with controlled tumbling of the gyro, The instrument shaii be 80 constructed that no parts will work loose in service and wiii withstand the normal strains of jars,
24、vibrations and such other conditions as are incident to shipping, storage, installation and service without failure, possible disassembly, repair or overhaul, service maintenance, and reassembly by those tools and items of maintenance equipment which are normally available as commercial standards wi
25、thout reg9ring special tools and fixtures. The case shall be ale for front mounting on an instrument panel. The body and mounting flange B; C MIL-I-21203A (WEP) Connections for Type II and Type IV Roll axis transmitting synchro stator TABLE I D; E; F G: B I; J P A; B; C Pitch axis transmitting synch
26、ro stator Synchro exitation, roll (26 volts ac, 400 cps. ) Synchro exitation, pitch (26 volts ac, 400 cps. ) K; M P: T Connections for Types I, li,. and IV 115/200 volt, 400 cps power source (neutral - N) 5 volt integral lighting source with pin G grounded to the case. Applies to Types III aid IV, T
27、his pin is to be used for supplying power to the .- -. _ erection torque motors. During normal operation (cutoftby turn sensitive switch) this pin shall be Connected (externally) to pin B. For cutoif by rate gyro, the rate gyro may be used to open the con- nections to this pin thereby cutting the er
28、ection. These two pins are to be connected across the turn sensitive erection cutout switch and should be shorted externally by a jumper during erection cutout by rate gyro. The foliowing sets of pins are to be used for pr- cessing the gyro during laboratory tests. During normal operation these pins
29、 should be shorted as follows: Roll channel (D shorted to F, and H shorted to J) Pitch channel (K shortedto M, and P shorted to T) TABLE II 6 . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-23203A 66 = 7777706 0330273 3 MIL-I-21203A NEP) * 3.
30、5.7 Time Totalizing Meter - The case shall incorporate a time totallzing meter Power Warning Flag - A warning device shail be incorporated which will conforming to the applicable requirements of Specification MIL-M-779.3. immediately indicate when phase rotation is incorrect, ac power failure occurs
31、, or during initial and demand erection conditions. 3.6 Dial - 3.5.8 - * 3.6.1 Cover Glass - The quality of the cover glass shall be in accordance with Specifi- cation DD-G-451, Type II, Wty AA. Any flaws permitted by Specification DD-G-451 shall not interfere with reading of the dial. The glass sha
32、ll not be fluorescent when exposed to ultraviole Wes BA 8.7 of Color No. 37778 of FED -sTD-595. The style and proportions of theletters and numerals shall conform to MS33558. The marking material shall be of a quality sufficient to ensure dura6aty of the markings in service use. Dimensions - Dimensi
33、ons and tolerances not specified shall be as close as is consistent with the best shop practices. Where dimensions and tolerances may affect the inter- changeability, operation or performance of the instrument, they shall be held or limited accord- Case Markings - All markings on the indicator case$
34、mll be made with material * 3.8.8 fwlY. *3.8.9 Gears - Gear assemblies shall be properly aligned and meshed and shall be operable without interference, tight spots, loose spots or other irregularities, Where required for accurate adjustments, gear assemblies shall be free from backlash. Provided by
35、IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I b MIL-I-21203A 66 - 9999906 0130273 5 = .- .- MIL-I-21203AWEPJ POWER WARNING FLAG: BACKGROUND - BLACK COLOR NO. 37038 COLOR NO. 37778 BANK ANGLE SCALE LETTERING - WHITE I .o00 ,330 .O62 MINIAlWRE AIRPLANE SHALL B
36、E WHIT3 WITH A BLACK BORDER ,025 MI N I ATU R E A I R P L A N E 7 k.062 WIDE AS SHOWN BANK INDEX SHALL BE WHITE WITB A BLACK BORDER 40s WIDE BANK INDEX DmNSIONS R? INCHES. UNLESS OTBERWISE SPECIFIED, TOLERANCES: DECIMALS f .005, ANGLXS 5 1/2“. b FIGURE 1. BANK ANGLE SCALE, MINIATE AIRPLANE AND BANK
37、INDEX 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-21203A 66 7777706 OL3027Y 7 = k- 1.803 2 .o f 3.606 IIIHENSIONS IN INCHES. WLECS GTiiERWISE SPECIFIED, TOLERANCES 2 ,010. FIOW 2. S- With proper correction for the earths rotation, the com
38、puted drift rate in the bank axis shail not exceed 15 degrees per hour, and in the pitch axis the computed drift rate shall not exceed 30 degre.es per hour. The test shall be repeated with the indicator pointed to the south, east, and-nom. TIle same tolerance shall apply, if the drift in one heading
39、 exceeds the limit by not more than one degree in 5 minutes, the indicator may be retested in that heading and accepted if the first repeat test is in limits, Loop and Roll Test - The indicator shall be mounted in a level position on a test fixhire permitting rotation about the riorizontal and later
40、al axis and allowed to reach equilibrium, . The indicator shall be looped through one complete revolution (inside loop) at a rate of 10 f 1 degrees per second, nie indicator shall indicate zero roll and pitch within 3 degres immediately after this maneuver. The indicator shall then be rolled through
41、 one complete revolution at a rate of 10 to 20 degrees per second, The indicator shail indicate zero roll and pitch within one degree immediately after this maneuver. Dielectric Strength Test - A potential of 220 volts (root mean square) alternating current at commercial frequency shall be applied b
42、etween isolated pins, and between pins and the case for a period of 10 seconds. There shall be no breakdown of inmilation or any otherpermanent damage to the instrument as a result of this test. - 4.6.13 * 4.6.14 17 . .- Provided by IHSNot for ResaleNo reproduction or networking permitted without li
43、cense from IHS-,-,-MIL-I-21203A 66 m 797770b 0330302 2 m Ma-I-21203A (WEP) 4.6.15 Pitch Scale Sensitivity Test - The indicator shall be mou- 111 a level position on a tiit ahle and dowed to rea3 equilibrium. The placement of the horizon bp of the sphere for angIes of ciimb shall be downward and for
44、angles o dive shaii be upward, The table shall be tilted BO thatthe pitch scale reads 5, 10, 15, 20, SO, 40, 50, 60, 70, 80 degrees in climb and then in dive. The angles which the table has been tilted shall agree with the respective readings of the pitch scale within plus or minus 1/2 degree for pi
45、tch scale indication up to and including 20 degrees, and within plus or minus one degree for greater pitch indications. test ahail be properly connected and ailowed to reach operating speed. A remote indicating system of the Bervo type, with synchro control transform2 input, electronic amplification
46、, and motor driven output, ehall be properly connected to the indicator under test. The remote indicating system shall be set to read zero when rec-ving Signais from a properly zeroed synchrotmsmitter. With the indicator under test in a level position the remote indicator 8ha-U hacator O 1v2 degree
47、in pitch and roll, A tolerance of plus or minus one degree of error shall apply to all positions of the indicator under test up to plus or minus 80 degrees in pitch and plus or minus 180 degrees in roll. iumination Test - The indicator except that colors shaii be as noted in figure 3. Magnetic-Effec
48、t Test - The indicator shall be held in various positions With its nearest part 5-l/2hhes from the center of a short bar-compass whose compensator magnets have been removed, and shall be set up in a Worm magnetic field whose horizontal intensity is between O. 17 and O. 19 oersted. The various positi
49、ons shaU be so chosen as to include that position which causes the maximum deflection of the compass. The maximum defection -Distyed water and the fact that the Government may have formulated, furnished or in any way supplied the said drawings, specifi- cations, or other data is not to be regarded by implication or otherwise as in any manner licensing the holder or any other person or corporation, or conveying an
