Downloaded from https://www.everyspec.com I V ,, . . .. . MIL-STD-81OD .,.19:July 1983 ., a. Propeller Aircraft. .,.. spectrum . . . q w -6 dBIOCT. \ . . .. ... \ - :“”. ,,,., \ I \ I 1,. .: ~~ .4. . . I I 0.01, 3+—.-. t/.. ;.. /, ..,. ,. I ., ;,,. , . , ,,; .. ,. .J!.,.-,. c FI F2.’..,,F3, , F4 2000 I ,.. -, , Frequency (Hz) :. ,. b. Engine Spectiurn Li 0.03. 15 F1 F2 F3 F4 2000 FIGURE 514.3-25. tiauested vlbra 10n -a for ‘ro- t =rcraft and eJIUIQQ . 0 .t.f3THOD 514.3 19 JUIY 1983 ,. 514.3-36