Cessna 17273274 Pilot Operating Handbook page 125

SECTION 7
AIRPLANE & SYSTEMS DESCRIPTIONS
The horizontal stabilizer is constructed of a forward and aft spar, ribs and
stiffeners, center, left, and right wrap-around skin panels, and formed
leading edge skins. The horizontal stabilizer also contains the elevator
trim tab actuator. Construction of the elevator consists of formed leading
edge skins, a forward spar, aft channel, ribs, torque tube and bellcrank, left
upper and lower "V" type corrugated skins, and right upper and lower "V"
type corrugated skins incorporating a trailing edge cut-out for the trim
tab. The elevator trim tab consists of a spar, rib, and upper and lower "V"
type corrugated skins. The leading edge of both left and right elevator tips
incorporate extensions which contain balance weights.
FLIGHT CONTROLS
The airplane's flight control system (see figure 7-1) consists of
conventional aileron, rudder, and elevator control surfaces. The control
surfaces are manually operated through mechanical linkage using a
control wheel for the ailerons and elevator, and rudder/brake pedals for
the rudder.
Extensions are available for the rudder/ brake pedals. They consist of a
rudder pedal face, two spacers and two spring clips. To install an exten­
sion, place the clip on the bottom of the extension under the bottom of the
rudder pedal and snap the top clip over the top of the rudder pedal. Check
that the extension is firmly in place. To remove the extensions, reverse the
above procedures.
TRIM SYSTEM
A manually-operated elevator trim system is provided; a rudder trim
system may also be installed (see figure 7-1). Elevator trimming is
accomplished through the elevator trim tab by utilizing the vertically
mounted trim control wheel. Forward rotation of the trim wheel will trim
nose-down; conversely, aft rotation will trim nose-up. Rudder trimming is
accomplished through a bungee connected to the rudder control system
and a trim lever, mounted on the control pedestal. Rudder trimming is
accomplished by lifting the trim lever up to clear a detent, then moving it
either left or right to the desired trim position. Moving the trim lever to the
right will trim the airplane nose-right; conversely, moving the lever to the
left will trim the airplane nose-left.
INSTRUMENT PANEL
The instrument panel (see figure
configuration. The gyros are located immediately in front of the pilot, and
arranged vertically over the control column. The airspeed indicator and
7-8
is designed around the basic "T"
7-2)
CESSNA
MODEL 172N
July
1 1979