CHAPTER 21
PAGE 3
PAGE DATE: 1. August 2014
MAINTENANCE MANUAL EXTRA 330/SC
21-40-00 HEATING
The EXTRA 330/SC can be equipped with a cabin heating
system, which allows feeding the cockpit with warm air. The
system uses fresh outside air, which is heated up by the
engine exhaust muffler. The system is controlled by a handle
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 control handle (9) the
warm air can there be guided into the cockpit or dumped
overboard. Turning the handle to the right as far as it will go
fixes the Bowden cable (8). A distribution box (5) is located
on the aft side of the firewall. The distribution box incorpo-
rates the flanges for the 2" ducting (6) to the air outlets (7)
at the pilot’s feet.
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