I Downloaded from https://www.everyspec.com MIL-STD-81.0D 19 .July 1983. k. Spools in servo valves to be displaced and oauee erratic and dangerous control system response. j. Pumps to oavitate. I-3 : ~. ,.:,.”.’ This test method should be applied at the end of the tailoring procese desoribed in section 4 of this standard. .,, -, NOTE: a. This test method ii applicable to equipment.and devices that are installed in aircraft, helicopters, manned aerosDace vehicles, ..: air-carried stores, and ground-launched missiles. ., b. Jk2atrlctu. None. ./..,.., . . . C. ~. The acceleration. ,. high temperature’test should be conducted prior to . ,, ,d. I@t varla.k2aa.
The tests vary in acceleration, axis of acceler- : ation, duration, test apparatus, and on/off state of.itemT ,, ...!. 1-3.1 Q@ce of test DrocedUrQS There.are two test procedures, Procedure 1,. (Structural Test) is used to dem~nstrate that equipment will structurally : withstand the loads induced by in-service accelerations.. Procedure II (Operational Test) is used to demonstrate that equipment will operate without degradation during and after being subjected to loads induced by in-service acceleration. Equipment to be tested should be subjetted to both Procedure I and Procedure11. tests unless otherwise specified. ,. .,,. I-3.2 _Cl@ce of test cwdaLLQM- .
Acceleration values for individual equipment items should be obtained from the aircraft structural loads analyseg. When the applicable aircraft i,sunknown, the values of.tableg 513.3-I and 513.3-II and the following paragraph may be used. .. . ,. For the,purpose of these testa, the direction of forwardacceleration is always considered to be the direction of forward acceleration of the host vehicle. ~ Tbe test item is tested in each direction along three mutually perpendicular axes for both test.,proce,dures.One axis is aline”dwith the forward..
acceleration of the vehicle, one axis is alined with the apanwise direction of .’ the vehicle, and the third axis is perpendicular to the plane of the other two axeg. Figure 5-13.3-1 shows the six acceleration test dir.ectiong. Except for helicopters, the test levels for.the six test,directions are always .. based on the forward acceleration of the vehicle. In the case of helicopters, forward acceleration is unrelated t.oacceleration in the other directions. Tables 513.3-I and 513.3-II list test levels for Procedure I (Structural Test) and Procedure II (Operational Test), test levels are: respectively. Factors which influence the : a. Forward acceleration of the vehicle, known or unknown?
the vehi’cle,known or unknown? \ b. Orientation of test item in .. METHOD 513:3. 19 JUIY 1983 ., 513.3-2