Technify Motors Cessna 172, Maintenance Manual

Page: 121 / 232

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-71-02
3
06.11.2013
17
46
1
25.08.2014
Table 71-9a Troubleshooting / Engine Speed Regulation
Table 71-10a Troubleshooting / Engine Smokes
Code Indication Code Task/Check Check by Corrective Action
Engine Speed Regulation
17
Poor engine
speed
regulation
17.1 Check gearbox oil
Replensish gearbox oil / Contact
TAE if gearbox has been operated
with low oil level
17.2
Have aggressive /
negative g maneuvers
been executed?
Wait for gearbox oil to settle
17.3 Check CSU oil supply
Remove hose from gearbox oil
pump to CSU. Oil should leak
from hose
Prime csu by filling hose with oil
17.4
Verify CSU supply
pressure =20 bar
Install gauge in oil line between
Dual Stage Pump and CSU. Start
engine, and verify that pressure is
20 bar +/- 1 at all power
settingswith warm gearbox.
Adjust CSU supply pressure at
black bleed valve on CSU block.
Close inner screw approximately
quarter turn for an increase of 1
bar.
Note : If CSU supply pressure is
30 bar or more, contact TAE
Support Hotline
17.5
Change gearbox oil
filter
Change gearbox oil filter
17.6
Check prop control
signal Refer to instructions to check
actuator / harness
17.7
Replace prop control
valve
17.8 Check propeller Refer to MT Propeller Manual
Code Indication Code Task / Check Check by Corrective Action
18 White smoke 18.1
Check for coolant leak
into exhaust chamber
system / combustion
chamber Verify exhaust pipe is dry / Check
coolant level, remove glow plugs,
check combustion chamber for
moisture
Contact TAE if engine uses
coolant or if moisture is found in
combustion chamber
19 Blue smoke 19.1 Perform leak down test
Refer to Repair Manual for
detailed instructions and
limitations
Contact TAE if not within
specification
20 Black smoke 20.1
Check manifold
pressure
Connect FADEC Service Tool
while performing a ground run and
reproducing the problem (at max.
power). Compare "MAP" to
"LiMAPTar". If capable, do so by
generaring graph. Deviation must
be /- 50 mbar.
Proceed to Code 30, "Induction
System"
20.2
Is engine running
roughly? Proceed to Code 6, "Engine Runs
Roughly"
Engine Smokes