COCKPIT DISPLAY / CONTROLLER
The control panel/display pressure indication shows bottle oxygen pressure,
which is directly related to the quantity of oxygen available for use. The
cockpit display allows the pilot to monitor the system performance and oxygen
quantity. The display/control includes a two-position master switch with ON,
OFF modes. The ON position engages the regulator solenoid to enable use
of the oxygen system; bottle pressure is displayed on the indicator when
the switch is in the ON position. The OFF position disengages the solenoid
which shuts off the supply of oxygen to the cabin outlets and nothing will be
displayed on the gauge. The O2 REQ’D LED will light when the aircraft is at
a pressure altitude greater than 12,000 feet until the oxygen system is turned
ON.
The fault LED annunciator light indicates potential problems with the oxygen
system directly relating to the delivery of oxygen to the cabin. A steady light
indicates low power (below 4.0 Volts) to the system or possible grounding/
shorting conditions. When a steady fault indication is present, the system is
disabled and will not reset until power is cycled to the controller.
A ashing
FAULT LED indication species an oxygen pressure fault to the distribution
manifold.
Figure 7-83 – Oxygen Control Panel/Display
NOTE: When the system is rst engaged, the FAULT light may briey
ash until proper pressure is sensed at the overhead distribution manifold.
This is normal, as pressure may bleed off when not in use.
NOTE: In the event of an electrical failure on Main Bus 2, oxygen will
remain on in the cabin. Aircraft electrical power is required ONLY to turn
the System ON and OFF. The system is designed to remain ON during an
electrical failure, but oxygen quantity indication will be lost. Disconnecting
the lines from the manifold will prevent the free ow of oxygen in the cabin.
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