1、MIL-I-21b5 bb W 777770b 0130530 4 W MIL-1-21685 (AER) IO NOVEMBER 1958 MILITARY 8pEcPICATIO INDICATOR, CWASS REPEAIER, RONW DIAL, TYPE MW-2 This specification has been approved by te Bureau of Aeronautics, Department of the 8avy. 1. SCOPE 1.1 e. - This specification covers certain design requirement
2、s and all performance require- ments for procurement of one type of 26 volt, single phase, 400 cycle, mtating dial compass re- peater indicator designated Type MW-2. 2.1 The following specifications, standards, and publication of the issue in effect on date of invitation for bids, form a part of thi
3、s specification: Federal. QQ-C-320 QQ-30 QQ-PA16 MIL-P-U MIL-C-5015 MIL-D-5028 MIL-E-5272 MIL-C-5541 MIL-1-6181 MIL-6872 MIL-L- MIL-P- MIL-S-n42 MIL -P-V 36 MIL-A-8625 MIL4 -17858 Federal - FED. sm. No. 1 FED. BTD. No. 595 Chromium Plating (Electrodeposited) Nickel Plating (Electrodeposited) Plating
4、, Camium (Electrodeposited) Preservation, Method of Connectors, Electric, “AW me Drawings and Data Lists: Environmental Testing, Aeronautical and Associated Equipment, Chemical Films for Aluminum and Aluminum Alloys Interference Limits and Tests; General Specification for Stabilized, 4“/ER, Type MA-
5、1 Standard for Laboratory Atmospheric Conditions for Testing Calors Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-I-ELb5 bb W 77777Ob OL3053L b =-I- 21685 /(AER) Military MIL-STD-130 M828094 lis33558 Ms33586 Air Force-avy Aeronautical m5727 Id
6、entification Bierking of U. S. Wiitary Property Indicator, Compass Repeater, Rotating Mal, Type MU-2 %umerals and Letters, Aircraft Instmt Mai, standard Metals, Definition of Dissimilar Form of Glass - Mrcrsft Instrumept Cover Air Force-Navy Aeronautical Uetin No. 143 Specifications and Standards, U
7、se of (When requesting any of the applicable documents refer to both title and number. Copies of this specification and applicable documents may be obtained upon application to the Conmanding Officer, %val Aviation Supply Depot, 700 Robbins Avenue, Piiilsdelphia 1l, Pennsylvania, Attention: Cade CDS
8、) 3.1 w ification. - The indicator furnished under this specification shall be a product which has been tested and has passed the qualification tests specified herein. 3.2 Selection of Government docilmente. - Bpecifications and standards for necessary conmiodities and services not specified herein
9、shall be selected in accordance with ARA EuIletin Ho. 143 except as provided in 3.2.1 and 3.2.2. 3.2.1 Commercial parts. - Comercial parts having suitable properties may be used where, on the date of invitation for bide, there are ao suitable stan- parts. parts, like screws, bolts, nuts, cotter pins
10、, havlng suitable properties may be used provided: In ny case, commercial utility (a) (b) They can be replaced by the standard parts (HS or An) wi+Aout alteration. The corresponding standard part numbers are referenced in the parts list a the dtchee opened, and a fine setting made on the rotor posit
11、ion to obtain the minimum voltage, approximately 10 millivolts. To set electrical zero accurately, a sensitive PSCULUU tube voltmeter must 4.6.6 Magnetic effect. - The indicator shall be revolved about a short bar magnet compss with the nearest part of the indicator 5-112 inches from the bar magnet,
12、 and ki a vertical plane which is a perpendicular bisector of the Rorth-South axis of the bar magnet. the indicator shall be held in positions O, 45, 90, 135, 180, 225, 270, aud 315 degrees from the initial poeition. in its normel operating position. The horizontal magnetic field intensity shall be
13、0.17 to 0.19 oersted. The deflection of the campass at any of the specified positions shall not exceed one degree. ehall be performed first with no voltage applied to the indicator and then shall be repeated with the indicator operating. Starting directly under.the compass, At each of these position
14、s the indicator shall be rotated on its horizontal axis until it is This test 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- - MIL-I-2Lb5 bb m 7799906 0130539 O m MIL-1-21685 (UR) I I . I Figure 3. Synchro Null Test Wiring 10 Provided by IHSNot f
15、or ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-ZLb85 bb 777770b 0330540 7 *- - MIL-1-21685 (UR) 4.6.7 Vibration error. - The indicator shall be mounted on the vibration stand in its normal operating position. lar motion in a plane inclined 45 degrees to the horiz
16、ontal plane with a circle diameter of between 0.009 and 0.Oll of an inch. The frequency of applied variation shall be varied slowly from 5 to 50 cycles per second. oscillation or variation in excess of one degree. The indicator shall be operated and shall be subject to vibration with a circu- Ho con
17、dition of applied variation shall cause vibration errors involving pointer 4.6.8 Damping. - Two indicators shall be connected to the standard data transmitter, with their pointers displaced (within the limits of 45 to 90 degrees) in opposite directions fram the locked standard data transmitter setti
18、ng, and instantly energized from the alternating current buss at 26 volts, 403 cycles per second. not exceed 4 seconds. The time 1Wt for pointer oscillation to mp out, if present, shall 4.6.9 Lou temperature operation. (This test may be combined with the Low temperature exposure test at the discreti
19、on of the testing agency). - The indicator shall be properly connected except that no power shall be applied. (-65. F) for a period of 4 hours. dicator connected to the standard data transmitter, power shall be applied to the indicator. end of the 4-hour period and with the temperature maintained at
20、 -54 C (-65“ F) the transmitter shall be rotated slowly through 360 degrees. without sticking or lagging by more than 3 degrees. The Indicator shall then be subjected to an ambient temperature of -54 C miring the last i5 minutes of the 4-hour period, and with the in- At the The indicator pointer sha
21、ll operate around the 360 degree dial 4.6.10 High temperature operation. test at the discretion of the testing agency). - The indicator shall be properly connected except that no power shall be applied. (160 F) for a period of 4 hours. applied to the indicator. (160“ F) the indicator shall be subjec
22、ted to and meet the requirements specified in the Individual tests. The indicator shall then be allowed to cool to room temperature and shall be subjected to and meet the requirements of the Scale error and Friction error tests. (This test may be combined With the High temperature exposure The indic
23、ator shall then be subjected to an ambient temperature of 71“ C During the last i5 minutes of the 4-hour period, power shall be At the end of the 4-hour period and with the temperature maintained at 71“ C 4.6.11 connected together, the voltage between pins “B“ and “DI shall decrease before increasin
24、g as the head- ing is increased. Phase rotation. - With the indicator dial set on the North heading, and pins “A“ and “E“ 4.6.12 Radio noise interference. - The electrical system of the indicator shall be tested for conducted and radiated radio noise interference in accordance with Specification 1-1
25、-6181. 4.6.13 Altitude. - The indicator properly connected with no power applied shall be tested in accordance with Procedure II of Specification MIL-E-5272 except that the chamber shall be reduced to 0.810 inch of mercury (,o00 feet) for a period of one hour. During the last i5 minutes of the one h
26、our period, power shaU be applied to the indicator. temperature and pressure maintained as specified, the indicator shall be subjected to and meet the requirements specified in the Low temperature operation test. At the end of the one hour period and with the 4.6.14 Low temperature exposure. - The i
27、ndicator shall be tested Fn accordance with Procedure II of Specification MIL-E-5272. The Individual tests shall be repeated at room temperahe. 4.6.15 High temperature expoaure. - The indicator shall be tested in accordance with Procedure I of Specification MIL-E-5272. The Individual tests shall be
28、repeated at mom temperature. 4.6.16 Vibration failure. -The indicator shall be tested in acco-nce with Procedure V of The indicator shall be subjected to and meet the requirements specified in Bpecification HIL-E-5272. the Individual tests. 4.6.17 Humidity. - The indicator shall be tested in accorda
29、nce with Procedure I of Specification MIL-E-5272. The indicator shall be subjected to and meet the requirenents specified in the Individual tests. Il Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-21685(AER) 4.6.18 Fungus resistance. - The ind
30、icator shall be tested in accolnance with Procedure I of Specification MIL-E-5272, except that the test period shall be i4 bys. fying agency, tests of the component parts of the indicator may be accepted in lieu of, or in addition to, tests of the assembled instrument. Salt spray. - The indicator sh
31、all be tested in accordance wlth Procedure I of Specifica- At the option of the quali- 4.6.19 tion MIL-E-5272. individual tests. The indicator shall be subjected to and meet the requirements specified in the 4.6.20 Mount- lugs. - The indicator case shall be mounted face downward on the removable hea
32、d of a suitable testing machine with the face of the case in a horizontal plane so that the mounting lugs receive no added support. attached to a pull strap in the stationary head of the machine. for one minute to each lug in a direction tmrd the front of the case. applied load without fracture and
33、there shall be no damage to any part of the indicator. A suitable pin shall be inserted through the hole in the mounting lug,and A load of 175 pounds shall be applied The lugs shall withstand the 4.6.U Life. - The indicator shail be subjected to a life test of 1000 hours. These 1000 hours shall incl
34、ude approximately 100 hours accumulated on the indicator during other tests. shall be bench mounted and operated normally during this test. The instrument 5. PREPARATION FOR IELNERY 5.1.1 Level A. - The indicator ehail be paclu3ged in accordance with Specification m-7936. The method of preservation
35、shall be in accordance with Specification MIL-P-U, Method IId using metal reusable containere. 5.1.2 Level C. - When this level is required, packaging shall be ln accordance with standard commercial practice. 5.2 Packing. 5.2.1 Levels A and B. - The indicator shall be packed in accordance with Speci
36、fication m-P-7936. The level or levels required shall be as specified in the invitation forbid or contract. 5.2.2 Level C. - The indicator shall be packed to insure that the shipment arrives Fn a satis- factory condition at destination. regulations in effect at the time of shipment. The shipment sha
37、ll confonn to the applicable carriers rules and 5.3 Marking. - The interior and exterior containers shall be marked as specified in Specification 1-7936, 6. HOTES. 6.1 systems. Intended use. - The compass repeater indicator covered by this specification is intended for use in conjunction with the MA
38、-1 compass system and other directional gyro roll stabilized compass 6.2 Order- data. - Requisitions, contracts ana orders shall specify the MS part number of the indicator desired, the quantity, and whether overseas packing is to be fiunished. 6.3 Qualification. - With respect to,products requiring
39、 qualification, awards uill be made only for such products as have, prior to the bid opening date, been tested axxi approved for inclusion in the applicable Qualified Products List whether or not such products have actually been 80 listed by that date. 12 Provided by IHSNot for ResaleNo reproduction
40、 or networking permitted without license from IHS-,-,-/ MIL-1-21685 66 W 7777706 01305LI2 O m MZL-1-21685 (AER) 6.3.1 The attention of suppliers is called to this requirement, and manufacturers are urged to arrange to and the fact that the Qovernment my have for- dated, furnished, or in any way supp
41、lied the said drawings, specifications, or other data is not to be regarded by implication or otherwise as in any manner licensing the holder or any other.person or corpora- tion, or conveying any rights or permission to manu- facture, use or sell any patented invention that may in any way be related thereto. E29199 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
