Honda HondaJet HA-420 Pilots Operating Manual page 98

Honda Aircraft Company
HA-420 SYSTEMS
POM DESCRIPTION
Engine Fuel System
An engine mounted, shaft-driven FPMU provides pressurized, metered
fuel to the engine as well as pressurized fuel to the aircraft fuel system to
be used for motive flow. Fuel passes through the FOHX before going to
the engine. A fuel filter bypass circuit is provided to allow the fuel to
continue flowing in the event of a blocked fuel filter. The FPMU
incorporates a Fuel Metering Valve (FMV) that meters the fuel supply to
the engine and also serves as the fuel flow meter for the engine.
A Pressurizing and Shutoff Valve serves as the fuel shutoff valve for the
engine under all normal operating conditions. The shutoff valve also
shuts off the fuel flow during certain failure cases. A separate firewall
shutoff valve is incorporated into the fuel system supply line outside of
the engine fire zone.
Engine Vibration Detection System
The engine incorporates a vibration detection system (VDS) that
provides an indication to the cockpit if the engine vibration levels exceed
the engine manufacturer's certified vibration limits.
Engine Drain System
The engine drain system includes both oil and fuel drains routed to a
drain mast on the underside of each pylon. During normal operations
there is no drainage out of these drains.
HJ1-29000-005-001
October 30, 2016 1-82
FOR TRAINING PURPOSES ONLY