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|  MIL-V-81995(AS)
4.5.4
Leakage. With the valve in the closed position and
with upstream air pressure and temperature specified in the specification
sheet, internal air leakage from the inlet port to the outlet port and
total leakage (internal plus external) shall not exceed the limits
specified in the specification sheet.
4.5.5
Proof pressure. With the valve in the closed position
and the outlet port open to atmospheric pressure, an air pressure equal
to two times the maximum inlet air pressure as specified in the specification
sheet, shall be applied to the inlet port of the valve for a period of
10 minutes. This test shall be repeated except that the valve shall be
in the open position and the outlet port shall be capped. Following
these tests, the valve shall function properly and leakage shall not
exceed the values specified in the specification sheet.
4.5.6
Vibration. The vibration test shall be conducted in
accordance with the method and procedure as follows:
4.5.6.1
Method. The valve shall be tested as a complete
assembly. Before and after this test, a calibration shall indicate that
no component subject to calibration has changed its calibration beyond
the design tolerance range. All components not subject to calibration
shall be operated and shall not have had any part of their function
impaired by the test.
4.5.6.2
The following procedure shall apply:
Procedure.
4.5.6.2.1
Test installation. The valve shall be mounted on a
test fixture to simulate aircraft installed position. If the aircraft
installation requires that the starter control valve be mounted directly
on the pneumatic inlet flange of the starter, the vibration test shall
be conducted with the applicable control valve mounted on a test fixture
simulating the starter as in the aircraft installation. To more closely
simulate the aircraft installation, the aircraft pneumatic duct may be
attached to the valve and supported as in the aircraft. If the starter
control valve is mounted remotely in the aircraft installation, the
valve shall be vibrated as a separate unit. The test fixture shall be
as rigid as possible and designed to eliminate or minimize fixture
resonances in the test frequency range. The test configuration shall be
such that rotational motion of the fixture is not induced due to any
unsymmetrical weight or stiffness distribution of the equipment. Measurements
of vibratory accelerations or displacements shall be made at the mounting
base of the valve. All frequency measurements shall be accurate within
+5 percent. All displacement or acceleration measurements shall be
accurate within + 5 percent. The motion of the vibrator table shall be
simple harmonic motion with not more than 10 percent distortion.
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