Honda HondaJet HA-420 Pilots Operating Manual page 109

Honda Aircraft Company
HA-420 SYSTEMS
POM DESCRIPTION
Drain Valve Arrangement
The fuel tanks have 7 drains. Two drain valves are located near the
inboard end of each wing tank and three valves are located on the center
lower surface of the carry-through tank.
Fuel Distribution System
Motive flow returned from the engine driven fuel pump is used to power
the main ejector (jet) pump in the collector tank. An electric boost pump
is also available to automatically increase the fuel supply pressure if the
fuel supply from the main ejector pump is insufficient.
The motive flow also powers three scavenge ejector pumps in each wing
to pump fuel into that wing's collector tank. The scavenge pumps are
distributed throughout the wing tank such that at least one scavenge
pump is submerged under all aircraft attitudes.
Two transfer ejector pumps installed in the C/T tank pump fuel from the
C/T to the L and R wing tanks continuously during operation. These
pumps are powered by motive flow diverted from the main engine feed
flow of either the main ejector pump or electrical boost pump.
Fuel from the fuselage bladder tank is transferred to the C/T tank by
means of a tank level control system. This system consists of a series of
float actuated shutoff valves (level control float valves), connected by
fuel tubes that automatically control the fuel flow from the fuselage tank
into the C/T tank to isolate the C/T tank from the head pressure of the
fuselage tank.
HJ1-29000-005-001
October 30, 2016 1-93
FOR TRAINING PURPOSES ONLY