Downloaded from https://www.everyspec.com MIL-5TD-810D 19 July 1983 TABLE 514.3-11. stealfunct~ test o~ see fieure 514.3-?5) Equipment Vibration Level Location 2/, 3/ Of at Fi, (g2/Hz) ~/ In fuselage or wing forward of propeller 0.1 I In fuselage or wing aft of propeller I 0.3 I In engine compartment or pylons 0.6 ,-. Equipment mounted directly oriaircraft engines 1.0 1/ Fi = F2 = fundamental excitation frequency 2F1, F3 = 3F1, F4 =,4F1 panela and racka ar’enot available for eauipment installed on vibration-isolated panels or racks, or when the equipment ia tested with isolators removed, use “fuselage or wing forward of propellerm category with levels reduced 4dB.
.2/ When ~ Increaae test levels 6dB for equipment mounted on fuselage or wing skin within one propeller blade radius of the plane of the propeller disc. For all other skin mounted equipment, increase level? by 3dB. 4/ Bandwidth of vibration around each F; will equal 25% Fi for constant-speed excitation. when,excitationis not constant-speed, bandwidth will encOmPass operating speeds for cruise and high power operation. . t METHOD 514.3 514.3-35 19 July 1983