Supplement Airplane Maintenance Manual
Cessna 172 with TAE 125-02-99 / -114
AMM-20-02
Chapter:
Issue:
Issue Date:
Page:
Content:
20-AMM-71-02
3
06.11.2013
18
46
Rev. No:
Rev. Date:
1
25.08.2014
Table 71-11a Troubleshooting / Cooling System
Code
Indication
Code
Task / Check
Check by
Corrective Action
21
Low coolant
level / Coolant
loss
21.1
Perform leak check on
coolant system
Install cooling system leak tester
in place of radiator cap.
Pressurize cooling system to
2.8 bar for 5 minutes. Check for
leaks
Repair coolant leak
21.2
Check for coolant
system leak into
exhaust pipe /
combustion chamber
Verify dry exhaust, remove glow
plugs check combustion chamber
for moisture
Contact TAE. Replace engine if
cooling jacket is damaged.
22
Low coolant
temperatur
e indication
22.1 Check coolant level
Check low coolant level
annunciator. Open radiator cap,
check level in expansion reservoir.
Replenish coolant / Isolate source
of coolant loss
22.2
Extreme environmental
conditions
Extremely cold OAT?
Compare to normal environmental
conditions; warm up engine
22.3
Check coolant temp
sensor function
Allow engine to adjust to
environmental condition. Connect
FADEC Service Tool, check
"TH2O". Is diplayed value closed
to OAT?
Proceed to Code 41, "Erroneous
Indication"
23
High coolant
temperature
indication
23.1 Check coolant level
Check low coolant level
annunciator. Open radiator cap,
check level in expansion reservoir.
Replenish coolant / Isolate source
of coolant loss
23.2
Verify radiator / heater
core unobstructed
Check cowl inlets for obstruction.
Check radiator / heater core for
contamination
Remove obstruction / Clean
radiator and heater core
23.3
Verify coolant temp
sensor function
Allow engine to adjust to
environmental condition. Connect
FADEC Service Tool, check
"TH2O". Is diplayed value closed
to OAT?
Proceed to Code 41, "Erroneous
Indication"
Cooling System
Summary of Contents for Cessna 172
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