Supplement Airplane Maintenance Manual
Cessna 172 with TAE 125-02-99 / -114
AMM-20-02
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20-AMM-21-02
3
06.11.2013
1
6
1
25.08.2014
21 ENVIRONMENTAL SYSTEMS
21.00 GENERAL
DESCRIPTION
The engine installation includes a heat exchanger, which is part
of the liquid coolant system and is located at the lower front
section of the engine compartment.
The CD-155 installation has an additional oil/water
heat exchanger for cooling the gearbox oil.
The heat exchanger for cabin heat is installed inline with the
unregulated exit of the cooling system thermostat.
Engine coolant passes through the heater core and heats
incoming air. The coolant flow through the heater core is always
open. The warm air supply is regulated by the pilot over the
heating valve.
In normal operation the control knob “Shut-off Cabin Heat“ must
be open, with the control knob “Cabin Heat“ the supply of warm
air into the cabin can be controlled.
In case of certain emergencies (refer to the appropriate Pilot´s
Operating Handbook), the control knob “Shut-off Cabin Heat“ has
to be closed according to the appropriate procedures.
Figure 1 Coolant System (TAE 125-02-99)
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