MIL-PRF-11021H
4.6.11 Conditions after rupture test. To determine conformance to 3.4.11, each of the
switch assembly circuits (except the circuit with the series wired resistor) shall be subjected to a
rupture current (up to 2000 amperes and 100 VDC) until the circuit opens (excluding the circuit
breaker cycling). A different switch assembly shall be used for each circuit test. After the
application of rupture current, power shall be applied between Pin F and the switch assembly's
case with its levers rotated to all the specified positions. The current flow shall be less than 10
mA.
4.6.12 Switch lever torque test. To determine conformance to 3.4.12, the switch
assembly shall be mounted in a suitable test fixture with the interlock disengaged as specified
(see 4.6.14). For each of the specified positions of each switch lever, the torque shall be
gradually applied until the lever rotates to the next adjacent position. The maximum torque
measured during rotation is the torque needed to actuate the lever. Each lever shall be rotated in
both the clockwise and counterclockwise directions.
4.6.13 Interlock strength test. To determine conformance to 3.4.13, the switch assembly
shall be tested as follows. With the mechanical interlock in the lock position, the main switch
lever shall withstand a minimum of 3 lbf-ft (4.1 N-m) of torque applied to the switch lever in the
plane of the switch rotation clockwise in OFF, STOP LIGHT, and SERVICE DRIVE positions.
With the mechanical interlock in the lock position, the main switch lever shall withstand a
minimum of 3 lbf-ft (4.1 N-m) of torque applied to the switch lever in the plane of the switch
rotation counterclockwise in B.O. MARKER and B.O. DRIVE positions. There shall be no
movement of the main switch lever, or damage to the switch assembly.
4.6.14 Interlock effort test. To determine conformance to 3.4.14, the switch assembly
shall be mounted in a suitable test fixture and a torque of 0.70 + 0.15 lbf-ft shall be applied to the
main switch lever in each position.
4.6.15 Endurance test. To determine conformance to 3.4.15, the switch assembly and its
levers shall first be subjected to tests specified in 4.6.12, 4.6.14, 4.6.17, and 4.6.18. Proper
function of the switch assembly, which includes proper switching and breaking of power to
lights, shall be monitored in real-time for correct functionality throughout the entire endurance
test. Any deviation from normal operation, even an intermittent anomaly, such that the switch
eventually returns to normal operation, shall be recognized as a failure and shall be cause for
rejection. Subsequently, the switch assembly shall be subjected to the tests as specified in
4.6.15.1, 4.6.15.2, and 4.6.15.3. All of the contacts listed in TABLE IV shall be monitored with
socket contact "A" connected to socket contact "K." Socket contact "F" shall be the sole current
source for the entire switch assembly.
4.6.15.1 Preparation. The switch assembly shall be loaded with incandescent lamps
connected with specified lengths of cables coming from the specified connector sockets to
provide the specified currents in TABLE IV. The exact values for each socket shall be recorded
prior to start of the 50,000 cycles.
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