1、 MIL-S-46371(MU) . AMENDMENT 3 -. 24 - March -_ 1972 - - SUPERSEDING AMENDmNT 2 30 December 1968 MILITARY SPECIFICATION SIGHT, INFINITY: 8635466 This amendment forms a part of Military Specification MIL-S-46371(MU), dated 12 April 1963. * Paragraph 2.1, under Drawings : Delete: TEL 8635466 - Index o
2、f Inspection Equipment List for Sight, fnf inity: 8635466“ and “LSQAP 8635466 - Supplementary Quality Assurance Provision List for Sight, Infinity: 8635466“. Add: “F8565556 Pressure Tester Two Station“ Paragraph 3.5: Delete and substitute: “3.5 Alignment.- With the mounting surface in a vertical pla
3、ne and the locating key horizontal within 1.0 minute, the center of the reticle pattern shall be projected 26 f 1.0 minute below a horizontal plane. It Add new paragraph 3.6 as follows: “3.6 Environmental“ * Paragraph 3.6.4: Delete and substitute: “3.6.4 Sealing.- The Infinity Sight shall show no ev
4、idence of The leakage in excess of 0.2 pounds per square inch (psi) when subjected to an internal pressure of 5. * 0.10 psi for a minimum of 2 hours. interior atmosphere of the accepted sight shall contain nitrogen having a dew point at lease as low as dnus 25F at atmospheric pressure. The sight sha
5、ll then be sealed with an internal pressure of between 0.25 and 0.50 psig of dry nitrogen. Paragraphs 4.3 and 4.3.1: Delete and substitute as follows: “4.3 First article (initial production) approval.- The require- ment for first article approval and the responsibility (Government or contractor) for
6、 first article testing shall be as specified in the FSC 1240 . I 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-46373 (3) 32 779770b 0333553 MIL-S -4637 1 (MU) AMENDMENT 3 contract. The sample for first article approval tests shall consist o
7、f 3 infinity sights manufactured in the same manner using the same materials, equipment, processes, and procedures as used in regular production. All parts and materials, including packaging and packing shall be obtained from the same source of supply as used in regular production. 4.3.1 Government
8、testin%.- When the Government is responsible for conducting first article approval tests, the contractor, prior to sub- mitting the sample to the Government, shall inspect the sample to insure that it conforms to all the requirements of the contract ana2 submit a record of this inspection with the s
9、ample, including certificates of conformance for materials.“ Add new paragraph 4.3.2 as follows: “4.3.2 Contractor testing.- When the contractor is responsible for conducting first article approval tests, the sample shall be inspected by the contractor for all the requirements of the contract. and a
10、 record of this inspection, including certificates of conformance for materials, shall be submitted to the Government for approval. The Government reserves the right to witness the contractor.s inspection.“ The sample * Paragraph 4*5.1: Delete “Supplementary Quality Assurance Provisions List (LCQAP)
11、 8635466“ and Substitute lthe technical data package (TDP) .I1 * Paragraph 4.6.2.3; Delete and substitute: “4.6.2.3 Device used to test accuracy requirement.- The device shall position the sight on a keyed locating surface with the mounting surface in a vertical-plane and the key horizontal within 1
12、0 minute. The surface used for measuring the projected reticle image shall be graduated in 1.0 f 0.2 mil increments, horizontally and vertically, in a manner suitable for measuring the subtended angle of the projected reticle pattern and the boresight adjustment requirements. shall be positioned 26
13、 f 1.0 minute from a horizontal plane.“ The surface Paragraph 4.6.2.6: Delete and substitute: “4.6.2.6 Sealing.- Special testing equipment to test sealing of Infinity Sight shall conform to the internal pressure test ijequirements of Drawing F8565556, pressure tester - two station.“ * Paragraph 4.7.
14、8: Delete and substitute: “4.7.8 Seal.in&- Internal pressurizing of the infinity sight shall Pres- be performed with special testing equipment conforming to 4.6.2.6. surize the infinity sight with dry nitrogen gas, having a dew point at least as low as minus 25 degrees Fahrenheit, to 5 pounds per sq
15、uare inch (psi) in accordance with the procedure for internal testing on Drawing F8565556. for the time duration specified in 3.6.4. of this time period, the elevation and deflection knobs shall be rotated to their clockwise and counterclockwise extremes, a minimum of 3 times. Retain the applied pre
16、ssure in the infinity sight - During the first 50 minutes Page 2 of 3 pages .- I- . -_ _. * ? Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- ML-S-4b371 (3) 12 = 9779906 0311552 T I MIL-S -4637 1 (MU) AMENDMENT 3 At the end of the 2 hour time period
17、 there shall be no evidence of leak- age as indicated on the pressure gage of the testing equipment, to determine compliance with 3.6.4. sealing test, the infinity sight shall then be flushed with the dry nitrogen gas specified herein. sight shall be periodically sampled through a dew point meter un
18、til the atmosphere shows a dew point at least as low as minus 25 degrees Fahrenheit. When this atmosphere is attained within the infinity sight, the infinity sight shall then be sealed in accordance with 3.6.4, The internal atmosphere of the infinity sight shall conform to the requirements of 3.6.4.
19、 Upon satisactory completion of the The interior atmosphere of the infinity * The outside margins have been marked to indicate where additions to the previous amendment have been made. This has been done as a convenience only and the Government assumes no liability whatsoever for any inac- curacies
20、 in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content as written irrespective of the marginal notation and relationship to the last previous issue. Custodian: Amy - Mu Preparing activity : Army - Mu Project No. 1240-A277 * U. S. GOVERNMENT PRINTING OFFICE 1972 -71616UU3 Page 3 of 3 pages i: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
