SECTION 7 CESSNA
AIRPLANE AND SYSTEMS DESCRIPTION MODEL
2088
(675
SHP)
CABIN HEATING, VENTILATING AND DEFROSTING
SYSTEM
(Continued)
MIXING AIR PUSH-PULL CONTROL
A push-pull control, labeled MIXING AIR, GRD-PULL, FLT-PUSH, is
located on the cabin heat switch and control panel. With the push-pull
control in the GRD position (pulled out), warm compressor bleed valve
air is mixed with hot compressor outlet air in the
mixerlmumer. This
mode is used during ground operation when warm compressor bleed
valve air is available (at power setting below 92% N,) and can be used
as additional bleed air heat to augment the hot compressor outlet bleed
air supply during periods of cold ambient temperature. With the push-
pull control in the FLT position (pushed in), cabin return air is mixed
with the hot compressor outlet air in the mixerlmuffler. This recirculation
of cabin return air enables the heating system to maintain the desired
temperature for proper cabin heating. If desired, the FLT position of the
push-pull control can be used on the ground when ambient
temperatures are mild and maximum heating is not required. In this
mode, the excess warm compressor bleed valve air available at power
settings below 92%
Ng is exhausted overboard from the mixing air
valve.
CAUTION
THE MIXING AIR PUSH-PULL CONTROL SHOULD
ALWAYS BE IN THE
FLT
POSITION (PUSHED IN) WHEN
THE AIRPLANE IS IN FLIGHT. CABIN RETURN AIR
CABIN
HEAT
DISTRIBUTION
SYSTEM.
IF
THE
FLT
POSITION IS NOT USED DURING FLIGHT, THE
SYSTEM MAY OVERHEAT AND CAUSE AN AUTOMATIC
SHUTDOWN.
(Continued Next Page)
1
7-100 U.S.
Revision
23
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