PREFLIGHT TESTING
Verify the oxygen valve opens and the system delivers appropriate low
pressure oxygen by checking the system annunciations on the oxygen
control panel. The low pressure reading should be in the green – normal
operating range. Verify the appropriate quantity of oxygen is available for
the ight. Verify the proper ow of oxygen is delivered to each mask prior to
ight. When the preight check of the oxygen system is complete, the oxygen
system may be turned OFF and then turned back on as required during ight.
BEFORE STARTING ENGINE
When departing on a ight which requires the use of supplemental oxygen,
brief any passengers on the proper method of donning masks, adjusting
owmeters, and connecting the mask line to the oxygen outlet.
EN ROUTE
Check the owmeter at intervals of less than every 10 minutes to ensure
proper settings. The owmeter must be held vertically when adjusting ow
rate or reading. The reading is taken at the midpoint of the ball. The pilot and
the passengers should limit their conversation to conserve oxygen. When
wearing either a face mask or cannula, the user should breathe through their
nose for most effective use of the oxygen.
SYSTEM SHUTDOWN
To turn the oxygen system off, place the oxygen control switch in the OFF
position. Leave the owmeters open until the low pressure side is relieved (in
approximately 5-10 seconds) and stow the lines, owmeters and masks in a
safe place.
USAGE DURATION
Oxygen duration charts are provided for the 115 cubic foot and 50 cubic foot
bottles. Refer to these charts for ight planning purposes.
NOTE: The master switch must be in the ON position to actuate the
oxygen regulator solenoid (to the ON or OFF position).
CAUTION: If the oxygen control switch is left in the ON position when the
master switch is turned off, the regulator will remain open and oxygen will
ow out of the masks until the bottle is emptied.
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