Diamond DA 42 NG, Maintenance Manual

Page: 1153 / 2339

AIRCRAFT
DA 42 NG Series
AMM
Ice Protection System
Doc # 7.02.15
Rev. 4
30-00-00
Page 9
15 Mar 2018
(4) Wing and Propeller Ice Protection System
(a) Proportioning Unit
A proportioning unit is located in each engine nacelle between the center wing spars. It is
accessible after removal of the small inspection panel on the outboard side of the nacelle.
The proportioning unit divides the fluid flow into three sub-branches. For each sub-branch
there is a capillary which ensures that the correct amount of de-icing fluid flows to the related
sub-branch.
One sub-branch goes forward to feed the propeller ice protection system (see Paragraph b).
Two branches go to the outer wing to feed the wing ice protection system (see Paragraph c).
(b) Propeller Ice Protection System
A Teflon tube goes from the proportioning unit forward to a nozzle near the propeller, where
the de-icing fluid drops onto a slinger ring. In the engine compartment of the nacelle the tube
is protected by a fire sleeve. The slinger ring has three notches that allow the de-icing fluid
to be distributed over the propeller blades by centrifugal action.
(c) Wing Ice Protection System
Two porous panels are attached to the leading edge of each outer wing. They discharge the
fluid onto the wing through many fine holes.
The panels are bonded to the wing leading edge. They cannot be removed without damage.
(d) Purging Connections
Near the rearward inspection hole cover on the outboard side of each nacelle an equal tee
for purging of the system is installed.
(e) Filter Bleeding Hose
In the LH nose baggage compartment behind the floor carpet.