OXYGEN
AIRPLANE
OPERATIONS
MANUAL
2-16-10
Page
8
Code
01
OCTOBER 02, 2001
CONTROLS AND INDICATORS (EROS MASK)
MASK STOWAGE BOX/CREW MASK
1 - TEST/SHUTOFF SLIDING CONTROL (spring-loaded in the pilot
and copilot boxes only)
− When pressed, with the mask stowed, allows testing of the
oxygen mask. Flow indicator turns yellow for a short time. The
OXY ON flag appears on the lid face.
− When pressed, with the mask not stowed and the left door
closed, shuts off oxygen to the mask. The OXY ON flag
disappears on the lid face.
2 - OXY ON FLAG (white)
− Appears when the box shutoff valve is open and oxygen is
supplied to the mask.
3 - FLOW INDICATOR (pilot and copilot boxes only)
− A yellow star appears when oxygen is flowing.
4 - VENTING VALVE CONTROL (pilot and copilot masks only)
− When actuated forward, opens the venting valve.
− A red band is visible to indicate that the control is actuated.
5 - HARNESS INFLATION CONTROL VALVE (red ear)
− When pressed, inflates the harness and allows mask donning.
6 - FLOW INDICATOR (observer mask only)
− The black shutter disappears when pressure is applied to the
mask.
7 - TEST/EMERGENCY SELECTOR KNOB
− When rotated clockwise, 100% oxygen is supplied under
positive pressure at all cabin altitudes. This mode must be
selected when using smoke goggles.
− When pressed, tests if the regulator demand mechanism
operates satisfactorily.
8 - NORMAL/100% SELECTOR
N - Oxygen/air mixture is supplied on demand. Mixture ratio is
dependent on the cabin altitude. Above 33000 ft, pure
oxygen is supplied.
100% - Pure oxygen is supplied at all cabin altitudes on demand.
This mode must be selected in conjunction with
EMERGENCY position, when protective breathing is
required.
To Next Page
