Honda Aircraft Company
HA-420 SERVICE, HANDLING,
POM AND MAINTENANCE
HJ1-29000-005-001
December 23, 2016 4-11
FUEL SERVICING
The HA-420 model airplane does not use a pressure fueling system but a
gravity feed system through a single port adapter, installed on the upper
right side of the aft fuselage. There is an optional digital external fuel
gauge installed on the fuselage skin adjacent to the fuel cap (Figure 4-6).
The external fuel gauge includes a digital fuel quantity display, which
shows the total fuel quantity. The external fuel gauge also contains three
LED lights to show when each of the tanks is full and two LED lights to
show if the fuel quantity units are in LBS or KGS. There is a refuel
master switch, which is installed adjacent to the external fuel gauge that
energizes the external fuel gauge and the fuel quantity signal conditioner.
NOTE The HA-420 AFM is approved for operation with or
without the use of fuel system icing inhibitors (FSII) that
meet specification MIL-DTL-27686 (EGME) or MIL-
DTL-85470 (DiEGME). FSII are approved in amounts
not more than 0.15% by volume.
There is no requirement to use FSII. If used, the inhibitor
must be injected into a stream of fuel and not poured or
splash-blended into the fuel tank. Fuel system icing
inhibitor can be added into the fuel by an injector system
downstream of the final filter/water separator on the
fueling unit (truck or stand) or by injection into the fuel
stream using aerosol cans at the appropriate fueling rate.
FOR TRAINING PURPOSES ONLY
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