Honda HondaJet HA-420 Pilots Operating Manual page 172

Honda Aircraft Company
HA-420 SYSTEMS
POM DESCRIPTION
Audio
Opening the stowage box doors selects the on-side mask microphone on.
Selecting the OXY MASK AUDIO switch to EMER forces the overhead
cockpit speakers on at a preset volume and both pilots' microphone
inputs to the oxygen mask microphones. Toggling the switch back to
NORM selects both speakers and both oxygen mask microphones off.
The oxygen mask microphones can be toggled on/off using the CDU
Audio & Radios page when the stowage box doors are open and the
OXY MASK AUDIO switch is in the NORM position.
A noise suppressor is mounted on each oxygen hose. When the ON/OFF
switch is selected ON, it filters out some of the breathing noise when the
mask is in use.
Passenger Oxygen
The cabin oxygen system consists of four passenger oxygen masks in the
main cabin (five if the side facing seat is installed) and one additional
passenger oxygen mask in the lavatory.
Each passenger mask features vinyl reservoirs and molded silicone
rubber face pieces. Upon deployment of the passenger masks, the act of
donning the mask pulls a pin from the dispenser, which opens a valve
and immediately starts the flow of oxygen to that mask.
Indications
The ENVIRONMENTAL and the STATUS synoptic pages show the
available oxygen quantity in liters.
HJ1-29000-005-001
October 30, 2016 1-156
FOR TRAINING PURPOSES ONLY