Section 7
Description of the Airplane and Systems
Columbia 400 (LC41-550FG)
RC050002
Initial Issue of Manual: November 10, 2004
7-140
Latest Revision Level/Date: A/12-01-2004
The oxygen annunciator will illuminate at approximately 12,000 ft PA when the system has
power from the bus but the system is turned off, in the display mode, or turned on and no oxygen
outlet pressure is available at the distribution port because the manual valve is in the off position,
or there is a system failure preventing oxygen pressure at the outlet. Placing the oxygen system
switch in the on position or solving the condition causing the low outlet pressure at the
distribution manifold can extinguish this warning.
Breathing Devices (Masks and Cannulas) –
The breathing devices have attached placards
indicating the proper method for donning, use, and safety precautions. When using nasal cannula
devices, breathing exclusively through the mouth, extremely light breathing, or nasal blockage
will inhibit oxygen flow.
NOTE
Breathing through the nose, and limiting conversation is required for the user to
achieve proper oxygenation when using nasal cannulas
.
WARNING
Do not use oxygen when utilizing lipstick, chapstick, petroleum jelly, or any
product containing oil or grease.
NOTE
If the pilot has nasal congestion, or other breathing conditions, a mask with
microphone should be used.
Flowmeter –
The oxygen flowmeters (see Figure 7 - 55) are simple devices to regulate the flow
of oxygen and provide flow indication to the pilot and passengers. Connect the flowmeters to the
distribution manifold and while holding the flowmeter vertical, adjust the ball so that the center
of the ball rests on the line for the planned cruise altitude for the type of breathing device used. If
changing altitude or requiring more oxygen for physiological reasons, adjust the flowmeter as
required. Periodically check the flowmeter (approximately every 10 min.) to ensure oxygen is
flowing and at the correct amount for the conditions.