1、 MIL-A-23670A (3) 66 7777706 OL3207b 7 -.- T MILLA-23670A (AS) Amendment - 3 12 abber 1972: Superseding Amendment - 2 22 February 1971 MILITARY SPEC1 FI CATION ATTITUDE HEADING REFERENCE SYSTEM AN/ASN-50 (*) This amendment forms a part of Military Specification MIL-A-23670A(WP), dated 1 November 19
2、65, and has been approved by the Naval Air Systems Command, Department of the Navy. By this amendment basic MIL-A-23670A(WP) is changed to MIL-A-23670A(AS) and throughout the specification, Bureau of Naval Weapons shall be changed to Naval Air Systems Command. Page 2 3.3.2.3, line 1: 3.3.2.4: Delete
3、 and substitute Delete “325“ and substitute “400“. “3.3.2.4 Time Totalizing Meter - The equipment shall.contain time totalizing meters in accordance with Specification MIL-M-7793. shall be included in the following units: Meters Unit - Amplifier-Power Supply Displacement Gyroscope Compass Adapter Ty
4、pe of Meter MS17322 MS17322 MS17322“ Page 3 3.3.6, line 3 after MIL-1-6181: Add “except that Short Duration Interference limit under paragraph 3.2.2 shall be 45 db for one second transient.“ Page 10 3.5.1.1.5, lines 8 and 9: Delete and substitute “When loaded with 8CTs, the line-to-line output volta
5、ge shall be 10.6 5.6V and the phase shift shall not exceed loo.“ - Licensed by Information Handling ServicesMIL-A-23670A (3) 66 9999906 0232077 9 I- MIL-A-2367OA (AS) Amendment - 3 Page 14 3.5.1.2.4, lines 9 and 10: Delete and substitute “When loaded with 8CTs, the line-to-line output voltage shall
6、be 10.6 -l-Jl.6V and the phase shift shall not exceed loo.“ Page 17 11.010 FIGURE 4, dimension 10.950: Delete and substitute “11.010“ 10.850 Page 20 3.5.2.8: Delete and substitute “3.5.2.8 Performance at Environmental Extremes - When tested at en- vironmental extremes, the amplifier-power supply sha
7、ll either meet the . tolerance specified for standard conditions or shall repeat within 20% the results of its individual tests made at standard conditions prior to the start of environmental tests, except that the servo amplifier maximum out- puts shall be not less than 80% of specified outputs at
8、standard conditions.“ Page 29 Add the following new paragraphs: * 3.5.6 Lubtication - * cated with grease conforming to MIL-G-81322 or MINIPURE grease with particle size not exceeding 50 microns. 3.5.6.1 Rotor Bearing Lubrication - The rotor bearings shall be lubri- * bearings shall be AS-2844 in ac
9、cordance with the requirements of MIL-L-6085. . 3.5.6.2 Bearing Lubrication - The lubricating oil used in gimbal * essed in accordance with MIL-STD-1334. 3.5.6.3 Barrier Film Bearing Coating - All bearings shall be proc- The coating material shall be in accordance with MIL-B-81744. All bearings, inc
10、luding chamfered races or corners, and including interfacing parts where applicable, shall be barrier coated. * 3.5.6.4 better. ing design permits. nated with lubricant AS-2844 and shall be ABEC-7 or better. Ball Bearings - Ball bearings shall be ABEC-5 grade or Teflon separators shall be used on gi
11、mbal bearings where the bear- Spin rotor bearings shall have porous separators impreg- Page 2 of 5 pages Licensed by Information Handling Services MIL-A-23670A (3) bb W 77777Ob 0332078 O - -1 m-A-23670A( AS) Amendment - 3 *3.5.6.5 Bail Bearing be-Loading - Means shall be provided for pre-loading and
12、 alignment without causing eccentric loading .unless otherwise authorized. Page 33 4.4.3, 4.4.3.1: Delete and substitute “4.4.3 conducted using MEL-STD-781. Phase and the All Equipment test shall be conducted. shall be imaccaxanqe with MIL-STD-781 and AR-34.I1 “4.4.3.1 contract or order, a minimum o
13、f three (3) equipments shall be tested as outlined in MIL-STD-781, under the section llQualification Phase of Production Reliability Tests.“ Table 5 of MIL-SrD-781. used. O Add the following new paragraph: Reliability Assurance Tests - Reliability Assurance Tests shall be Tests as required by both t
14、he Qudification Classification of failure Quaiification, Phase - Prior to the acceptance-of equipments under the The maximum number of equipments to be used shall be those listed in The Accept-Reject Criteria for Test plan III shall be *h.4.3.1.1 Reliabiity Assurance Production Acceptance Testing sh
15、all be conducted through Reliability Assurance Production Acceptance Phase - a productin burn-in. Qualification Test shall be operated for 150 operating hours burn-in, and the test data (operating hours and failures) shall be totaled and compared to the Accept/Reject Criteria of Test Pian II of MIL-
16、STD-781. necessary to accomodate the data.) any one time the experience from the beginning of the contract is included. At the conclusion of each month the test results shall be sent to the procur- ing activity and to the Naval Air Systems Command, Attention: Delivery of equipment shall not be held
17、up to await a decision under the test plan. equipment shall be reduced to 100 operating hours. current total of test hours and test failures plotted on Test Pian IV curves (extended) show a Reject Situation, the Procuring Activity shall be notified. The procuring Activity reserves the right to stop
18、the acceptance of equipment at any time that a Reject Situation exists pending a review of the contractorls efforts to improve the equipment, the equipment parts, the equipment workman- ship, etc., so that the entire compilation will show other than a rejection decision. For the Production Acceptanc
19、e Phase, Test Level E.shalbe used, except that the tenperature extremes shall be +55C and -44C, and vibration shall be O.SG. Details of the burn-in tests shall be included in the test procedures. Each equipment- produced but-not submitted to the (Extend the lines as These totals shall accumulate so
20、that at Avionics Division. In event an Accept Decision is reached, the test duration of each At any time that the Page 31 4,4,3,3: Delete in its entirety. 4.4.3.6: Delete 1NIL-R2309411 and substitute 11MIL-sTD-781.11 Page 3 of 5 pages Licensed by Information Handling Services- MIL-A-23670A (3) 66 =
21、9777906 02132079 2 W I Add MIL-A-23670A(AS) AMENDMENT-3 4.4.3.7 Test Details - The test details such as the length of the test cycle, the length of the heat portion of the cycle, the performance characteristics to be measured, special failure criteria, preventive maintenance to be allowed during the
22、 test, etc., shall be part of the test procedures of 4.6 to be submitted to and approved by the procuring activity prior to the be- ginning of the acceptance test phase of the reliability assurance tests. Page 36 4.6, line 1, after “preproduction tests“: Add :r initial production tests“. Page 38 6.9
23、 under Appl. Par. “Delete and &bs t i tute 3.4.1 3.5.1 3.4.2 3.5.2 3.4.3 3.5.3 3.4.4 3.5.4 3.4.5 3.5.5 Page 39 6.11: Delete “MIL-R-23094 Reliability Assurance for Production Acceptance of Avionic Equipment, General Specification for.“ and substitute “MILSTD-781 Reliability Tests, Exponential Distrib
24、ution.“ Add the following under military specifications: MIL-L -608 5 Lubricating Oil, Instrument, Aircraft, Low Volatility MIL-G-81322 MIL-B-81744 Grease, Aircraft, General Purpose Wide Temperature Range Barrier Coating Solution and Solvent Add the following under military standards MIL-STD-1334 Pr
25、ocess for Barrier Coating of Anti-Friction Bearings Page 4 of 5 pages 1 I Licensed by Information Handling ServicesMIL-A-23670A (3) 66 m 7777906 OL320O 7 m MIL-A-2 3670A( AS) Amendment - 3 Page 40 6.11 Delete MS17323 Meter, Time, Totalizing, Miniature 400 Cycle, Dial At the end of para. 6.11, add th
26、e following: I Naval Air Systems Command AR-34 Failure Classification for Reliability Testing, General Specification for Lubricant, instrument Ball Bearinge High Flash Point AS-2844 Page 41 FIGURE 6, dimension - .177 : .176 Delete and substitute Specification Analysis Sheet Delete “Bureau of Naval Weapons and substitute “Naval Air Systems Command“ (2 places) .Delete “(WN-5)“ and subs titute “.(AIR-53374B) : Project No. 66Q5-N233 Page 5 of 5 pages Licensed by Information Handling Services
