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| MILT81821
3.3.1.21.6 Power control panel.
Each trainer, independently operable trainer panel and
panel group which requires external electrical, hydraulic, or pneumatic power shall be provided with
a power control panel. This panel shall contain the master keyed lock switch, elapsed time meter(s),
"Power On" light(s), circuit breakers and phase indicating warning light(s) as required. The power
control panel shall be installed in a clearly visible location.
3.3.1.21.6.1 Master keyed lock switch.
A master keyed lock switch shall be provided on
each trainer power control panel to control the availability of power for components of the training
panel. Power for the ground support equipment receptacles on the trainer panel shall bypass the
master keyed lock switch. The switch or circuit breaker shall return to and remain in the OFF
position in the event of power interruption. The switch shall be marked in accordance with
3.3.3.15.
A separate one ( 1 ) inch diameter red pilot light for each type
3.3.1.21.6.2 Power on light.
of electrical, hydraulic, and pneumatic power required shall be installed on each trainer power
control panel in a clearly visible location. The light(s) shall be appropriately marked to indicate
POWER ON for the master switch, and for each type power required for the trainer panel. The
light(s) shall illuminate when the applicable type of power is available on the trainer panel.
3.3.1.21.6.3 Phase sequence indicating light.
For 3-phase power, a red warning light shall
be provided on the power control panel to indicate incorrect phase rotation when appropriate. The
light shall be connected to the power input side of the three phase power source to the trainer
panel.
Circuit breakers in accordance with requirement No.
3.3.1.21.7 Circuit protective devices.
37 of MlLSTD454 shall be provided for each type of electrical power required on each trainer
panel. Circuits shall be protected in accordance with requirement No. 8 of MILSTD454.
Phase-reversal relay(s) to protect equipment from damage in case of incorrect phase sequence shall
be incorporated in each trainer requiring 3-phase power.
3.3.1.21.8 Emergency power control switch.
An emergency power control switch shall be
incorporated on each trainer panel to deactivate all electrical, hydraulic and pneumatic power as
applicable. Actuation of any emergency power off switch on a multiple panel trainer shall
deactivate the power from all inter-connected panels. Emergency power control switches shall be
connected to the equipment side of the master keyed lock switch and shall be mounted in an area
readily visible and accessible from the front side of the trainer panel. Emergency power control
switches shall be marked in accordance with 3.3.3.21.
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