Cessna Skyhawk 172N Pilot Operating Handbook page 238

(12) Avionic-Power Switch - ON
(13) Radios - ON
(14) Ammeter - Check positive charge, alternator warning light
must be OFF
(15) Voltmeter - Check in green range
(16) Electric Fuel Pump - OFF
(17) Flaps - RETRACT
WARM UP
(1) Let the engine warm up about 2 minutes at 890 RPM.
(2) Increase RPM to 1400 until oil temperature 50°C (122°F),
coolant temperature 60°C (140°F).
BEFORE TAKE-OFF
(1) Parking Brake - SET
(2) Cabin Doors and Windows - CLOSED and LOCKED
(3) Flight Controls - FREE and CORRECT
(4) Flight Instruments - CHECK and SET
(5) Fuel quantity - CHECK
(6) Fuel Selector Valve - SET to BOTH
(7) Elevator Trim and Rudder Trim (if installed) - SET for
take-off
(8) FADEC and propeller adjustment function check:
a) Thrust Lever - IDLE (both FADEC lights should be OFF)
b) FADEC Test Button - PRESS and HOLD button for
entire test
c) Both FADEC lights - ON, RPM increases.
WARNING:
d) The FADEC automatically switches to B-component
(only FADEC B light is ON)
e) The propeller control is excited, RPM decreases
f) The FADEC automatically switches to channel A
(only FADEC A light is ON), RPM increases
g) The propeller control is excited, RPM decreases
h) FADEC A light goes OFF, idle RPM is reached, the test
is completed.
i) FADEC Test Button - RELEASE
Page 4-8
Issue 2
Revision 7, Jan. 2018
Reims/Cessna (F) 172 N&P
If the FADEC lights do not come on at this
point, it means that the test procedure has
failed and take off should not be attempted.
Supplement POH
with TAE 125-02-114