Cessna Skyhawk 172N Pilot Operating Handbook page 249

Supplement POH
Reims/Cessna (F) 172 N&P
with TAE 125-02-114
AMPLIFIED PROCEDURES
STARTING ENGINE
The TAE 125-02-114is a direct Diesel injection engine with
common-rail technology and a turbocharger. It is controlled
automatically by the FADEC, which makes a proper
performance of the FADEC test important for safe flight
operation. All information relating to the engine are compiled in
the CED 125 multifunction instrument.
Potentiometers within the thrust lever transmit the load value
selected by the pilot to the FADEC.
If the engine master is switched ON, the preheating relay is
actuated by the FADEC and the glow plugs are supplied with
power. The glow duration depends on the engine temperature.
If the engine master is switched OFF, the injection valves are
not supplied with power and remain closed. The switch/push
button "Starter" controls the Starter.
EXTERNAL POWER
External power may be used to charge the battery or for
maintenance purposes. To charge the battery with external
power the battery switch must be ON.
When using an External Power Source, the Battery Switch must
be in the OFF position before connecting the External Power
Source to the airplane receptacle.
It is not allowed to start up the engine using external power. If
starting the engine is not possible using battery power, the
condition of the battery must be verified before flight.
Page 4-19
Issue 2
Revision 7, Jan. 2018