Downloaded from https://www.everyspec.com 19 July .1983: MIL-STD-81OD ‘ c. For fighter and attack aircraft, acceleration loads induced by roll, pitch, and yaw change maneuvers. . ..... . ,, These factors are accounted for as follows. I-3.3 rd accelera Ion known and t. ~. est item ori.en@LL 1 .. When the forward acceleration of the vehicle is known and the orientation of the test item is known, the acceleration test levels for Procedure ‘Itests are those values that are obtained from table 513.3-I when the known.forward acceleration ia substituted for A in the table. The acceleration test levels for Procedure II teata are obtained in the same mannerusing table 513.3-II.
For helicopters,the test levels in the tables apply regardless of forward acceleration. I-3.4 Forward acc~ and test item orienta~. When the forward acceleration of the vehicle is known and the orientation‘ofthe test item is unknown, the acceleration test levels “for Procedure I tests are the values obtained from table 513.3-1, which givea the highest test level when the known forward acceleration is substituted for A in the table. Use this value to test the item in each.o~ the six test directions. The acceleration test levels for Procedure II tests are obtained in the same manner using.table 513.3-11.
For helicopters, the highest,test level in each of the tables aPPlies regardless of the forward acceleration. I-3-5 EmiacLacceleratbbnknown and the test ite m orienta t. n knQMIA. When the forward acceleration of the vehicle is unknown and the orientation of the test item is known, the acceleration tests levels for Procedure I tests are those values obtained from table 513.3-I when the probable forward acceleration as listed in the table for tbe relevant vehicle category is substituted for A. The acceleration teat levels for Procedure II tests are obtained in the same manner using table 513.3-11.
(Not applicable“to helicopters.) I-3.6 Forward acceleration urkwn and the test item orientation un@2wn. When the forward acceleration is unknown and the orientation of the test item is unknown, the acceleration test level for Procedure I teets is the highest value obtained from table 513.3-I when the probable forward acceleration as listed in the table for the relevant vehicle category is substituted for Uee this \ level to test the item in each of the six directions. The acceleration test level for Procedure II tests is obtained in the same manner using table 513.3-II. (Not applicable to helicopters.) ,. I-3.7 F~C alrcraft.
The test levels as ‘determinedfrom tables 513.3-1 and 513.3-IItare based on accelerations at the center of gravity (CG) of the host vehicle. For fighter and attack aircraft, the test levels in general must be increased for equipment that is located away from the vehicle CG to account for loads induced by roll and pitch change maneuvers. Roll impacts the up and down and lateral left and lateral right acceleration loads.“’ Pitch change impacts the up and down and fore and aft acceleration loads. ,, 19 July 1.983 513.3-3 METHOD 513.3