Embraer EMB145 Operation Manual page 2163

CREW MASK
The crew mask is a quick-donning oro-nasal type that allows oxygen
flow on demand or under pressure, as required.
The mask is provided with an automatic oxygen dilution system that
provides pure oxygen with cabin altitude over 33000 ft. It can also be
manually selected to the 100% position to provide pure oxygen at all
altitudes or to EMERGENCY position to maintain positive pressure in
the venting orifice.
The quick-donning operation is as follows:
− Hold the mask with one hand by the hose and the inflation
control valve (red ears).
− Pull the mask out of the box.
− Press the inflation control valve (red ears) firmly. The harness
inflates rapidly, and takes a shape large and rigid enough to
allow the user to don it quickly.
− Release the regulator ears. The harness will then deflate,
securing the mask to the user's face.
NOTE: The EROS Mask is provided with two red ears, while the
PURITAN Mask possesses one red ear and one black ear.
The pilot and copilot masks are provided with a venting valve, a
venting orifice (refer to smoke goggles in this section) and a
microphone.
The observer's mask is similar to that of the pilot and copilot, with the
exception that the observer's mask has no venting valve and features
a flow indicator installed in the supply hose.
OCTOBER 02, 2001
AIRPLANE
OPERATIONS
MANUAL
OXYGEN
Page
7
2-16-10
Code
01