De-Icing Methods - Honda HondaJet HA-420 Pilots Operating Manual

Honda Aircraft Company
HA-420 SERVICE, HANDLING,
POM AND MAINTENANCE
Refer to TAKEOFF – ANTI-ICE FLUID PERFORMANCE
ADDITIVES (Section 5 – Performance) of the Airplane Flight Manual
for increased takeoff speeds and distances if Type II or IV fluids are used.

DE-ICING METHODS

The preferred method of de-icing is to place the airplane in a heated
hangar. By placing the airplane in a heated hangar the entire airplane can
be warmed. When using this method of de-icing it is imperative that a
thorough pre-flight inspection be done. Runoff from melting frost, snow
and/or ice may puddle around or near flight controls and could refreeze
when the airplane is moved outdoors or during flight. These areas must
be dry and unobstructed. Once the airplane is deemed aerodynamically
clean, departure should take place within a short time if there is still
precipitation. If anti-icing is required (for example, during precipitation),
the process should begin as soon as possible after the airplane is clear of
the hangar. Holdover time after anti-icing should be minimized.
Other methods of de-icing/anti-icing include mechanical means, spraying
of de-icing fluids or a combination of both.
Using Mechanical Means to De-ice
Mechanical means include brooms, brushes, squeegees and nylon ropes.
When de-icing is being accomplished by mechanical means ensure that
ground personnel work from support stands placed near the aircraft. If
stands are not available, extreme caution must be exercised when
walking on aircraft surfaces to avoid slipping or sliding off aircraft. It is
recommended that rubber or fabric footwear be worn when walking on
aircraft surfaces. Use special care to avoid damage to antennas or
aerodynamic devices such as wing tip triangles, wing bumps, vortex
generators, etc.
Using Fluids to De-ice/Anti-ice
Heated solutions of de-icing fluids and water are normally used for de-
icing. If required, anti-icing is accomplished by using more concentrated
colder solutions of fluids which produces a lower freeze point on the
HJ1-29000-005-001
October 30, 2016 4-35
FOR TRAINING PURPOSES ONLY