1、MIL-T-23447A (1) 58 M 7797706 0152221 2 M I I P4I.Lt-T -2344gA(AS) Amenment-1 20 October i969 . Miiitwj Specification Transndttirg Set, Radio AN/PRT-5 (*) Plis amendment forms a part of Wlitaxy specification bKGR-23449A(AS), 28 Jsly 1969, and has been approved by the Naval Air Systems Comd, Departme
2、nt of the Navy. Page 2, Paragraph 2.1, under Naval Air Systems Comd: Add - Failure Classification for Reliability Testing , General Requirements for“ Page 10, Paragraph 4.4.1.3: Delete and Substitute: under the conditions specified herein for a period of ten hours witnout failure. ing of the equipme
3、nt. be made by using such controls and adjustments that are accessible to the operator during the nom use of the equipment. deleted if the reliability test includes a test on each equipment which consumes at least ten hours of operation 4.4.1.3 Manufacturing Run in Test- Each equipment shall be oper
4、ated A failure shall be defined as anything which causes malfunction- Only those adjustments will be permitted which can This test shall be Temperature Humidity Vibration Ambient room Ambient room Any selected frequency within the range of 20 to 30 cps (excluding resonant poigts) and a minimum ampli
5、tude of - + 3 gs The equipment shall be vibrated (without vibration isolators) for a period of ten minutes prior to the beginning of the ten hour period of operation. Where feasible, the equipment shall be operated during this vibration per- icd for the purpose of detecting flaws and imperfect workm
6、anship, tion within the specified limits of satisfactory performance is not necessar- iiy required during the vibration period. snould be vertical to the nom1 mounting plane for five minutes and lateral to the plane for five minutes. eqment in two directions the vertical direction shall be used. the
7、 ten hour period of operation following the ten minute vibration period, the equipment shall be mechanically cycled periodically throqh its various phases of operation. Opera- ?“ne direction of vibration Where it is not feasible to vibrate the During Should a failure occur, it should be TtjM FUMENT
8、CNTWS a _?AB. FSC 5820 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1. MIL-T-23447A (1) 58 7779706 O352222 4 I, MILT -23449A(AS) Amendment -1 20 October i969 repaired and the test started over, except that the ten minute vibration period need not
9、be repeated when it is certain the failure was not a re- sult of the vibration. shall be taken to eliminate this defect from fiture equipment. A record shall be kept of all failures. be composed of two five hour periods to conform with standard working hours. Should repetitive failures occur, correc
10、tive action The ten hour period specified above my Page 11, Paragraph 4.4.1.3.1: Delete Page 11, Paragraph 4.4.1.3.2: Delete Page 12, Paragraphs 4.4.2 thru 4.4.2.4: Delete and Substitute: 4.4.2 Reliability Assurance Tests- Reliability Assurance Tests shall be conducted using 1&m781. Tests as reauire
11、d bs both the Qualification Phase and-the Product ion Acceptance (SampliG) Phase shall be conducted. Classification of failure shall be in accordance with MIGSTD-781 and AR-34. 4.4.2.1 Qualification Phase- Prior to the acceptance of equipments under the contract or order, a minimum of three (3) equi
12、pments shall be tested as outlined in MI,-Sm781, under the section entitled “Qualification Phase of Production Reliability Tests.“ to be used shall be those listed in Table 5 of m-s&781. Qualification Phase, Test Level II shall be used. Criteria for Test Plan E shall be used, except that the lower t
13、est tem- perature shall be -30C. The equipment, throughout production, shall be tested as outlined in MIbSTD-781 (as modified herein) under the section entitled “Production Acceptance (Sampling) Phase of Production Reliability Tests.“ Y shall be used except that the lower temperature limit shall be
14、-3OOC. The maximum number of equipments For the The Accept-Reject 4.4.2.2 Reliability Production Acceptance (Sampling) Phase Tests- Test level 4.4.2.2.1 All Equipment Test- Each equipment produced except those s*&.*Zted for the Reliability Qualification Test, shall be tested for 50 helms. If the bur
15、n-in period is to be used the details thereof must be included in the approved test pro- cedures. Any equipment experiencing failure dwing the 50 hour test shall be repaired and returned to test for another 50 hour period of operation so that the last 50 hours of operation a-e failure free. To deter
16、mine whether the MIBF is being nEt st ay the during the contract the total operating test hours and the f&hres thereon (not counting burn-in failures or burn-in operating time) shall 9e totaled a?d the results compared with the curves of Test Plan II 3f XILSTD-781. At na the shall the plot of total
17、test tine and failures cross the accept Prior to the 50 hour- test or, each equipment, a burn-in period be used at the option of the contractor. The 50 hours of operation siiall be failure free. (Extend the lines as necessary to accomodate the data.) 2 Provided by IHSNot for ResaleNo reproduction or
18、 networking permitted without license from IHS-,-,-MIL-T-23447A (3) 5B 777770b 0352223 b MZGT -23449A(AS) Amendment-1 20 October i969 line (extended) of Test Plan II. at any one time the experience from the beginning of the contract is included. At the conclusion of each month the test results shall
19、 be sent to the procuring activity and to the Naval Air Systems Cormand, Attention: Avionics Mvision. test hours and test failures plotted on Test Plan II curves show a re- ject situation, the procuring activity shall be notified. The procuring activity reserves the right to stop the acceptance of e
20、quipment at any tgm that a reject situation exists pending a review of the contractors eiforts to .improve the equipment, the equipment puts, the equipment workmnship, etc., so that the entire compilation will show other than a reject decision. These totals shall accumulate so that At any time that
21、the current totals of 4.4.2.3 Length of Heat Portion of Cycle- After stabilization at the high temperature limit required by test level E (t55C) the equip- mnt snall be operated 3.0 hours during each cycle (as per 5.2.3.2 of sm781). 4.4.2.4 Perfomce Characteristics to be Measured- The following equi
22、pment characteristics me to be measured during the stabilized heat portion of the cycle: (1) Modulation (per 3.4.4) (2) Frequency Stability (per 3.4.2) (3) Power Output (per 3.4.5) 4.4.2.5 Test Details- The test details such as the length of the test cycle, the length of the heat portion of the cycl
23、e, the perfomce characteristics to be measured, special failure criteria, preventive mintenance to be allowed during the test, etc., shall be part of the test procedures to be submitted and approved by the procuring activity prior to the beginning of the Qualification Test Phase of the Reliability Assurance Tests. Preparing Activity: NAVY - AS 3 Project Nunher 5820-N-453 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
