OXYGEN
AIRPLANE
OPERATIONS
MANUAL
2-16-10
Page
10
Code
01
OCTOBER 02, 2001
CONTROLS AND INDICATORS (PURITAN MASK)
MASK STOWAGE BOX/CREW MASK
1 - FLOW INDICATOR (pilot and copilot only)
− A bright star appears when oxygen is flowing.
2 - TEST/RESET Button (spring-loaded in the pilot and copilot
boxes only)
− When pressed, with the mask stowed, allows testing the oxygen
mask. Flow indicator shows a bright contrast for a short time.
The OXY ON flag appears on the lid face.
− When pressed, with the mask not stowed, shuts off oxygen to
the mask. The OXY ON flag disappears on the lid face.
3 - OXY ON FLAG (white)
− Appears when the box shutoff valve is open and oxygen is
supplied to the mask.
4 - PURGE VALVE (pilot and copilot masks only)
− Automatically opens when the smoke goggles are donned.
− Supplies oxygen only in EMERGENCY position.
5 - FLOW INDICATOR (observer mask only)
− Indicates oxygen pressure.
− Color: Green for proper pressure.
Red for low pressure.
6 - HARNESS INFLATION CONTROL VALVE (red ear)
− When pressed, inflates the harness and allows mask donning.
7 - CONTROL KNOB
− When rotated, allows selection of oxygen supply modes.
− Oxygen supply mode is indicated by a white mark.
8 - NORMAL POSITION
− Oxygen/air mixture is supplied. Mixture ratio depends on the
cabin altitude.
− In the event of an emergency decompression, a 100% oxygen
flow will be provided.
9 - 100% POSITION
− Pure oxygen is supplied at all cabin altitudes.
10 - EMERGENCY POSITION
− Pure oxygen with a slight positive pressure is supplied at all
cabin altitudes.
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