.(~; .,> MILST&31ti-::”:; Downloaded from https://www.everyspec.com ,; 3,2 Test level determination,- lhe G level t+ be applied to the test itf?n ~ is contingent an two factors: ‘iledirection of forward accelerationlevel (A) of the vehicle, and the orientation of the test item within the vehicle. 15 June Where: A = me highest Pxsible known or unknohn forward acceleration of a vehicle in which equipnemt is to be mounted. (A) shall never be less than one G level. Instructions for selection of test levels for Frocedure I from table 513.l-I, end for Procedure II from table 513.1-11 are as follows: Forward Orientation accel.
of of test item vehicle in vehicle Test lavel Known hok Substitute known accelerationA in forward acceleration column of appropriate e vehicle category, and use given multiplying factors to attain test level for indicated directions. Known IJnkmwn Substitute known acceleration A IJ fortia?-d acceleration COIIUR.Iof appropriate catepr,y~ and use largest given multiplying factor to attain test level for all directions. unknown Gown Select most probable level from those given in forward acceleration column of appropriate category, and use given multiplying factors to attain test level for required direction.
Unknown UnknOwm Select most probable level from those given in forward acceleration column of appropriate ~.. category, and use largest given multiplying factor to attain test level for all directions. 3.3 Procadure I. Structural test. - The test it& shall be irmtallad on the acceleration apparatus in accordance with section 3, Ganaral Requir&nents, para- graph 3.2.2, by its normal mounting means. G level shall be determined in accordance with 3.2, and shall be applied while the test it= is nonoperating. 3.3.1 Performanceof test. - G level determined for the test shall be app~ed along at least three mutually perpendicular axes in two opposite directions along each axla.
The test time duration In each direction shall be at least 1 ud.nute followlng centrifuge stabi~iaation. Cm centrifuges, a test time of 1 minute I* usually aufficiant to detemine StruCtWd SOU@IeES (~Oper operation); howaver, the test time w be inbr&s6d. Test times for other apparatus will probablybe shorter, depending upon the type of apparatus. At the conclusion of the test, the test item shall be operated “ad the results compared with the data obtained in ac- cordance with section 3, Ganeral Requirements, paragraph 3.2.1. The test itea shall then be inspected as specified in section 3, General Requirements, paragraph 3.2.4. 3.4 Frocsdure II. Cmerational test.
- ‘lhetest itcm shall be installed on the accelerationapparatus in accordance with section 3, General Requirenanta, WWrar@ 3.2.2, by its ncmal mounting means. Ihe G level shall be detemined accordance with 3.2, and shall be applied while the test item is operating. in MX’IWOD513.1 20 October 1969 513.1-2 (