MIL-DTL-10215M
assembly shall be wiped over the entire area with a good quality, absorbatant tissue. Then the
tissue shall be visually inspected; no evidence of absorbed lubricant shall be allowed.
Subsequently, the flexible shaft assembly shall be subjected to the test specified in 4.5.4.1
4.5.5.2 Vibration resistance. Speedometers and tachometers shall be mounted as if in
operation and subjected to the vibration test as specified in MIL-STD-202, method 201, except that
motion shall be applied for 1 hour in each direction of the three major axes. During vibration, each
speedometer and tachometer shall be operated in such a manner that the speedometer and tachometer
pointer shall be at midscale, and observation shall be made for oscillation. At the conclusion of the
test, neither the components nor the assemblies shall show any evidence of cracking or disintegration.
4.5.5.3 Shock resistance. Speedometers and tachometers shall be mounted as if in operation
and subjected to the shock test as specified in MIL-STD-202, method 213, using the sawtooth shock
pulse procedure. The test shall be repeated 10 times and applied in the vertical axis. During shock,
the speedometer and tachometer shall be operated in such a manner that the speedometer and
tachometer pointer shall be at midscale, and observation shall be made for oscillation. At the
conclusion of the test, they shall show no evidence of pointer sticking, no delay of functioning and
no disintegration of component materials or assemblies.
4.5.5.4 Waterproofness testing - Speedometers, tachometers, flexible shaft assemblies and
adapters. When the speedometers, tachometers, flexible shaft assemblies and adapters are tested in
leakage. When called out, the saline solution shall be in accordance with 4.2.3.1.
4.5.5.4.1 Vacuum and pressure tests for speedometers and tachometers.
4.5.5.4.1.1 External vacuum test. Speedometers and tachometers shall be subjected to an
external vacuum test to verify waterproofness. The speedometer and tachometer connectors shall be
sealed with caps simulating the mating flexible cable connectors or as otherwise specified. The
flexible shaft assemblies and adapters shall be sealed against leakage. The test chamber shall be
evacuated to a pressure 6 pounds below atmospheric to create a minimum of 6 psi (0.42 kg(f)/cm2)
of internal pressure to all voids within the component while totally immersed in the saline solution
(see 4.2.3.1) for 30 minutes during qualification testing. The component shall be carefully observed
for air bubbles from the interior of the device during the specified time period. Bubbles that are the
result of entrapped air on the various exterior surfaces of the device shall not be considered a leak.
4.5.5.4.1.2 External pressure test. Following the external vacuum test in 4.5.5.4.1.1, the
speedometers and tachometers shall be subjected to an external pressure test to verify
waterproofness. The speedometer and tachometer connectors shall be sealed with caps simulating
the mating flexible cable connectors. The test chamber shall then be pressurized to 6 pounds above
atmospheric to create a minimum of 6 psi (0.42 kg (f)/cm2) of internal pressure to all voids within
the component while totally immersed in the saline solution (see 4.2.3.1) for 30 minutes during
qualification testing. The component shall be carefully observed for air bubbles from the interior of
the device during the specified time period. Bubbles that are the result of entrapped air on the
various exterior surfaces of the device shall not be considered a leak.
4.5.5.4.2 Internal pressure test for flexible shaft assemblies and adapters. Finally, the
flexible shaft assemblies and adapters shall be subjected to an internal pressure test to verify
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