Fire Protection - Honda HondaJet HA-420 Pilots Operating Manual

Honda Aircraft Company
HA-420 SYSTEMS
POM DESCRIPTION

FIRE PROTECTION

Fire Isolation
Fire isolation is accomplished by firewalls incorporated as barriers
between the nacelle fire zone and the pylon as well as firewalls at the
forward and aft ends of the nacelle fire zone.
Engine Fire Detection System
The fire detector system for each engine is independent and functionally
identical. Each consists of an engine mounted gas filled sensor element
which is connected to a pressure sensor unit. When the sensor element is
heated the increased pressure is sensed and indicated in the cockpit.
The Avionics System constantly monitors the Fire Detector Sensor
integrity.
Engine Fire Suppression System
The fire suppression system for each nacelle consists of a single,
pressurized, halon-filled fire extinguisher bottle located in the pylon
outside of the lower firewall and a fire suppression nozzle located inside
the fire zone below the engine. The discharge of extinguishing agent is
executed by an electrically actuated squib. The electrical continuity of
the squib ignition circuit is monitored by the aircraft avionics system as
is bottle pressure. A hermetically sealed frangible rupture disc at the
discharge outlet relieves the internal pressure should it increase to unsafe
levels due to overheating. The discharge of the bottle is detected by a
combination of the low pressure indication and the loss of electrical
continuity in the squib ignition circuit.
HJ1-29000-005-001
October 30, 2016 1-87
FOR TRAINING PURPOSES ONLY