Supplement Airplane Maintenance Manual
Cessna 172 with TAE 125-02-99 / -114
AMM-20-02
Rev. No:
Rev. Date:
Chapter:
Issue:
Issue Date:
Page:
Content:
20-AMM-75-02
3
06.11.2013
1
18
1
25.08.2014
75
LIQUID COOLING
75.00
GENERAL
DESCRIPTION
The engine is fitted with a fluid-cooling system whose three-way
thermostat regulates the flow of coolant between the large and
small cooling circuit.
The coolant exclusively flows through the small circuit up to a
cooling water temperature of 84°C and then between 84°C and
94°C both through the small and the large circuit.
If the cooling water temperature rises above 94°C, the complete
volume of coolant flows through the large circuit and therefore
through the radiator. This allows a maximum cooling water
temperature of 105°C.
The cooling system contains approx. 10 liters coolant.
There is a sensor in the expansion reservoir which sends a signal
to the warning lamp "Water level" on the instrument panel if the
coolant level is low.
The cooling water temperature is measured in the housing of the
thermostat and passed on to the FADEC and CED 125.
The connection to the heat exchanger for cabin heating is always
open; the warm air supply is regulated by the pilot over the
heating valve. See Figure 1 or 2.
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 section 3), the control
knob "Shut-off Cabin Heat" has to be closed according to the
appropriate procedures.
Figure 1 Coolant System without gearbox oil cooler (TAE 125-02-99)
Thermostat positions:
-
external circuit
- both circuits
- small circuit
-> Heating circuit always open
Heating radiator
Water pump
Engine
Expansion Tank
Cooling system TAE 125
schematic
Pressure valve
Flow direction
Flow direction
Flow direction
IN
IN
OUT
IN
OUT
OUT
IN
Small
circuit
External
circuit
Heating
circuit
OUT
Coolant level warning
Temperature sensor
Coolant
radiator
Thermostat
Содержание Cessna 172
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