Supplement Airplane Maintenance Manual
Cessna 172 with TAE 125-02-99 / -114
AMM-20-02
Rev. No:
Rev. Date:
Chapter:
Issue:
Issue Date:
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20-AMM-71-02
3
06.11.2013
19
46
1
25.08.2014
Table 71-12a Troubleshooting / Lubrication System
Code
Indication
Code
Task / Check
Check by
Corrective Action
24
Low oil
pressure
indication
24.1 Check oil level
Replenish oil / Investigate for
secondary damages
24.2
Check oil pressure
sensor connector and
connector
Ensure SB TAE 125-0003 is
completed. Check P-Oil pressure
sensor connector
Proceed to Code 41, "Erroneous
Indication"
25
High oil
pressure
indication
25.1 Verify oil type
Replace oil
25.2
Check oil pressure
sensor wiring
Proceed to Code 41, "Erroneous
Indication"
25.3
Verify correct
connection of all oil
lines to and from the
appropriate location
Connect hoses correctly /
Investigate for secondary
damage. Contact TAE
26
Erratic Oil
pressure
indication
26.1
Check oil pressure
sensor and connection
Ensure SB TAE 125-0003 is
completed. Check P-Oil pressure
sensor connector
Proceed to Code 41, "Erroneous
Indication"
27
High oil
temperature
indication
27.1
Check environmental
conditions
Extremely high OAT?
Compare to operation under
normal conditions
27.2 Check oil level
Replenish oil / Investigate for
secondary damages
27.3
Check oil cooler for
obstructions
Check cowl inlets for obstruction.
Check oil cooler core for
contamination
Clean oil cooler / Remove
obstruction
27.4
Check oil temperature
sensor and connection
Proceed to Code 41, "Erroneous
Indication"
28
Oil leak
28.1
Oil leak from wastegate
control valve air filter.
Oil present in induction
manifold / exhaust pipe
Examine turbocharger for oil leak /
Replace turbocharger
28.2 Isolate oil leak source
Clean engine. Peform ground run.
Locate oil leak. Determine
whether engine oil (black) or
gearbox oil (lighter color) leak.
Repair oil leak
29
Excessive
Blow-by
29.1 Perform leak down test
Refer to Repair Manual for
detailed instructions and
limitations
Contact TAE if it´s not within
specification
Lubrication System
Summary of Contents for Cessna 172
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