CHAPTER 21
PAGE 3
PAGE DATE: 1. March 2011
MAINTENANCE MANUAL EXTRA 330LX
21-40-00 HEATING
The EXTRA 330LX can be equipped with a cabin heating
system, which allows feeding the front and rear cockpit
independently with warm air. The system uses fresh outside
air, which is heated up by the engine exhaust muffler. The
system is controlled by two handles in the rear cockpit.
On the left front engine baffle a 3” air intake (1, figure 1) with
screen is positioned. From there fresh air is routed through
a 3" ducting (2) to the exhaust muffler heat shroud (3), where
it is heated up. An inlet box (4) is placed on the engine side
of the firewall. Using the main handle (9) the warm air can
there be guided into the cockpit or dumped overboard. A
distribution box (5) is located on the aft side of the firewall.
Using the distribution handle (8) the ratio of warm air supply
between front and rear can be controlled. Turning the handles
to the right as far as they will go fixes the Bowden cables. The
distribution box incorporates the warm air dispensers for the
front occupant as well as the flange for the 2" ducting (6) to
the air outlets (7) at the pilot’s feet.
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