Elevator Trim; Landing Lights; Power Check; Takeoff - Cessna 172S NAV III Pilot Operating Handbook

SECTION 4
NORMAL PROCEDURES
BEFORE TAKEOFF
(Continued)
ELEVATOR TRIM
CESSNA
MODEL 172S NAV III
The elevator trim tab is in the takeoff position when the trim pointer '
is aligned with the index mark on the pedestal cover. Adjust the
trim wheel during flight as necessary to make control wheel forces
more neutral.
LANDING LIGHTS
It is recommended that only the taxi light be used to enhance the
visibility of the airplane in the traffic pattern or enroute. This will
extend the service life of the landing light.
TAKEOFF
POWER CHECK
It is important to check full throttle engine operation early in the
takeoff roll. Any sign of rough engine operation or sluggish engine
acceleration is good cause for discontinuing the takeoff. The engine
should run smoothly and turn approximately 2300 - 2400 RPM with
mixture leaned to provide maximum RPM.
Full throttle run ups over loose gravel are especially harmful to
propeller tips. When takeoffs must be made over a gravel surface,
advance the throttle slowly. This allows the airplane to start rolling
before high RPM is developed, and the gravel will be blown behind
the propeller rather than pulled into it.
I
Prior to takeoff from fields above 3000 feet pressure elevation, the
mixture should be leaned to give maximum RPM at full throttle with
the airplane not moving.
After full throttle is applied, adjust the throttle friction lock clockwise
to prevent the throttle from moving back from the maximum power
position. Similar friction lock adjustments should be made as
required in other flight conditions to hold the throttle setting.
(Continued Next Page)
U.S.
172SPHAUS-03