(12) Wing Mounted Safety Switch. A wing mounted safety switch (with safety pin and lag), located on
top of the right wing, just aft of the nacelle, prevents the iring of chaff or lares when the pin is inserted. This safety
pin shall be inserted while the aircraft is on the ground and removed prior to light or during system test.
Figure 4-16. Wing Mounted Safety Switch
(13) Left Main Gear squat switch (WOW). The Weight-On-Wheels (WOW) switch (part of the aircraft) is
one of four safety mechanisms used to safe the system when the aircraft is on the ground. When the WOW switch
is open, weight is on wheels and 0V is applied to WOW Relay K1 in the Safe/Arm Control Panel. When the WOW
switch is closed (in air), +28 Vdc is distributed to WOW Relay K1 where it closes the relay.
c. AC/DC Power Distribution. The Mission Control AC/DC Power Cabinet provides prime 115 Vac 3ø power to
the ECU and +28 Vdc to the ECUSP. The ECU and ECUSP distribute the electrical power to the remaining system
components for power and control functions.
(1) 115 Vac. When AAR-57 3ø/5A CB is closed on the Mission AC/DC Power Cabinet, 115 Vac, 3-phase,
400 Hz power is routed to the ECU. At the ECU, the AC power runs the two fans and internal power supply. The
power supply provides internal dc voltages and distributes +30.6V (sensor) power to the EOMS.