1、MIL-C-25548C (2) 1 INCH-POUND I MIL-C-25548C (USAF) AMENDMENT 2 7 SEPTEMBER 1994 SUPERSEDING AMENDMENT 1 26 MAR 84 MILITARY SPECIFICATION CONTROL, PUBLIC ADDRESS SET C-1614/AIC-13 This amendment forms a part of Military Specification MIL-C-25548C (USAF) dated 18 June 1970 and is approved for use by
2、the Depaxtment of the Air Force and is available for use by all Departments and Agencies of the Department of Defense. PAGE 1 * 1.1: Add after the first sentence: “This specification may be used or Control, Public Address Set C-3944(P)/AIC-13. When C-1614/AIC-13 is stated in this document, C-3944(P)
3、/AIC-13 may be substituted and applied accordingly. The only difference between these controls is that the latter uses 6 volts for its panel lighting. This difference will be addressed in paragraphs 3.2.5.1 and 4.5.2.“ 2.1 Delete: “MIL-E-5272“ and its title. Add : “MIL-STD-810, Environmental Test Me
4、thods.“ * Add : The headings “HANDBOOK“ and “MILITARY“ and list “MIL- HDBK-781“ - “Reliability Test Methods, Plans, and Environments for Engineering Development, Qual if icat ion , and Product ion. PAGE 3 * Add: 3.2.5.1: Control, Public Address Set C-3944(P)/AIC-13 uses a lamp voltage of 6 volts ins
5、tead of that specified for C-1614/AIC-13. The appropriate nomenclature shall be used on the circuit label.“ PAGE 6 and PAGE 7 * 4.3.2 Table IV, DELETE: .“Salt Spray, Temperature Shock, Sand and Dust, and Fungus.“ SUBSTITUTE: “Salt Fog and Explosive Atmosphere.“ AMSC N/A 1 of 3 FSC 5831 DISTRIBUTION
6、STATEMENT A: Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-25548C (USAF) AMENDMENT 2 * 4.3.2 Table IV: ADD UNDER THE FOLLOWING HEADINGS: Inspection or Test Paragraph Preproduction Indivi
7、dual s amp1 ing “Environmental Stress 4.5.6 Screening al 1 all PAGE 8 * 4.5.2: Add to the end of the paragraph: “Public Address Set Control C-3944(P)/AIC-13 uses a lamp voltage of 6 volts. Make certain that the test circuit does not put 27 volts into the lamp circuit.“ 4.5.4: Delete and substitute:
8、“4.5.4 Environmental Tests. The applicable environmental tests shall be performed in accordance with MIL-STD-810. Tests not listed do not waive the requirements in designing the component for airborne use or storage under extreme conditions. The following tests shall be conducted on the components o
9、f an intercommunication set: a. Temperature-Altitude Method 504 Procedure I b. Humidity Method 507 Procedure I c. Salt Fog Method 509 Procedure I d. Explosive Atmosphere Method 511 Procedure I e. Vibration Method 514 Procedure I, Curve M, f. Shock Method 516 Procedures I and II It Parts 1, 2, and 3
10、PAGE 9 * 4.5.5.1: Delete and substitute: “4.5.5.1 Reliability Test. The preproduction samples of the equipment shall be tested by the contractor or reliability in accordance with MIL-STD-781 and MIL-HDBK-781 using test plan V-D and the parameters 00 = 6000 and 01 = 2000. accordance with test plan V-
11、D of MIL-HDBK-781. The performance parameters to be monitored during the reliability testing shall be as specified in the individual tests of Table IV of this document. -These parameters shall be included in the detailed reliability test procedure prepared by the supplier.“ The accept-reject criteri
12、a shall be in all“ * Delete 4.5.5.2, 4.5.5.3, 4.5.5.4, 4.5.5.5, and 4.5.5.6 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I MIL-C-255q8C (2) m 9999906 1970013 30T m MIL-C-25548C (USAF) AMENDMENT 2 * ADD: “4.5.6 Environmental Stress Screening (ESS
13、). Each control shall be non-energized and subjected to 25 temperature cycles from -54OC to. +7loC chamber temperature at a temperature rate change of 15OC per minute minimum. Temperature dwell at temperature extremes shall be that time required for the item to stabilize in temperature. Stabilizatio
14、n occurs when the temperature of the part of the control having the longest thermal lag has met or exceeded the maximum or minimum temperature for 5 minutes.“ NOTE: The margins of this amendment are marked with an asterisk or vertical lines to indicate where changes (additions, modifications, correc
15、tions, deletions) from the previous amendment were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the last previous amendment. I Custodian : Air Force - 99 Preparing Activity: Air Force - 84 Pro ect Number : 5831-F094 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
