Selkirk College IATPL Program Manual
Beech 95 POH
Effective September 1, 2005
Appendix 14 - 74
Picture shows the iris valve that controls air
entering the heating chamber.
Picture shows iris valve close.
Air to be heated enters the heater through an iris valve in the nose of the airplane. This
valve is opened by pushing the Cabin Air “T
-
handle” below the pilot sub
-panel all the
way in. A switch on the iris valve prevents both the heater and blower from operating if
the Cabin Air handle is pulled out more than half way. Pulling the cabin air handle out all
the way stops all airflow through the system preventing drafts in the cabin when the
heater is not in use.
With the iris valve open, ram air forces air through the heating system in flight; for
ground operation the ventilation air blower maintains airflow. A switch connected to the
nose landing gear actuation linkage ensures that the blower operates with the landing gear
down, the Heat and Blower switch on (up) and the Cabin Air control in at least half way.
The blower is shut off automatically when the gear is retracted and may be shut off
manually with the Heat and Blower switch (middle) or by pulling the Cabin Air control
out more than half way.
Summary of Contents for Beech 95 2017
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