3.Regulator Function
100% Mode
The regulator is switched to different
modes using a rotating knob.
A double cross check allows the user’s
colleagues to know in which mode the
regulator is in.
• This mode is used during the stowage and the donning.
• It allows the user to breathe 100% oxygen.
• To activate the 100% mode, turn the rotating knob to the “100%”
position.
Normal Mode
• This mode must be used when pre-
breathing is performed or after emergency
descent,
when
diversion
altitude
is
reached.
• It allows the user to breathe a mixture of
ambient air and oxygen.
• To activate the Normal mode, turn the
rotating knob to the “N” position.
Emergency Mode
• In
Emergency
mode
the
regulator
supplies an oxygen overpressure.
• It prevents smoke and harmful gases from
entering into the mask, allowing the user
to breathe safely.
• To use the Emergency mode, turn the
rotating knob to the “EMGCY” position.
Double cross
check
4NUT0577 issue 3
