Cessna 172 Skyhawk SERIES Installation guide

CESSNA 172 TRAINING MANUAL
by D. Bruckert & O. Roud 2006 29
Illustration 3c Control Y

CESSNA 172 TRAINING MANUAL
Trim System
The Cessna 172 aircraft has a manually o erated rudder and elevator trim
system.
One trim tab is rovided on the right side of the elevator, s anning most of the
the rear section of the right elevator. The trim tab moves o osite to the control
surface, reducing the aerodynamic force on the control surface in order to hold
the selected osition. Trimming is accom lished through the elevator trim tab by
turning the vertically mounted trim control wheel. Forward (u ) rotation of the
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ELEVATOR TRIM:
NEW MODELS ELEVATOR TRIM:
OLDER MODELS
Illustration 3d Trim tab Travel
Illustration 3e Trim Wheel

CESSNA 172 TRAINING MANUAL
trim wheel will trim nose-down, conversely, aft (down) rotation will trim nose-
u . The trim tab control wheel de ending on the model may be mounted on the
centre console or in the cock it floor. A ortion of the wheel extends through the
control wheel cover and when rotated, o erates the tab through roller chains,
cables, an actuator, and a ush- ull rod. A osition indicator at the trim tab
control wheel indicates nose attitude of the aircraft.
A rudder trim system
is installed in later
models to rovide a
means of directional
trim. The
system increases
directional stability
and is es ecially
useful during climb-
out o erations
when the engine is
o erating at nearly
full ower and the
aircraft forward s eed
is
relatively low. The
trim com ensates for
engine torque by
a lying slight rudder
control in
the direction
necessary for
maintaining straight
forward flight. During
cruise, the rudder
trim may be adjusted to maintain balance for any ower setting and airs eed.
The rudder trim, if installed, is o erated by either a rudder trim control tab or
control wheel mounted on the centre control edestal.
With a rudder trim control wheel, rotation of the control wheel to the right
rovides "NOSE RIGHT" trim, and left rotation rovides "NOSE LEFT" trim. A
rudder trim osition indicator indicates the trim setting when the trim control
wheel is adjusted.
With a trim lever, trimming is accom lished by lifting the trim lever u to clear a
detent, then moving it either left or right to desired trim osition (as shown in
the icture below). Moving the trim to the right will trim nose-right, conversely,
moving the lever to the left will trim nose-left.
The rudder trim control is connected via a bell crank to a bungee, which is
directly connected to the rudder edal control bar and thus to the rudder itself.
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Illustration 3f Trim Connections

CESSNA 172 TRAINING MANUAL
Typical IFR Ra io Installation (Conventional Aircraft)
The icture below illustrates a full IFR avionics stack on older models of aircraft.
From to : Audio Selector, GPS, Com 1/Nav 1, Com 2/Nav 2, Trans onder, ADF
by D. Bruckert & O. Roud 2006 84
Illustration 10e IFR Radio Stack

CESSNA 172 TRAINING MANUAL
FLIGHT OPERATIONS
PRE-FLIGHT CHECK
The reflight ins ection should be done in anticlockwise direction as indicated in
the flight manual, beginning with the interior ins ection.
by D. Bruckert & O. Roud 2006 85

CESSNA 172 TRAINING MANUAL
Cabin
Ensure the required documents (certificate of airworthiness, maintenance
release, radio license, weight and balance, flight folio, flight manual, and any
other flight s ecific documents) are on board and valid.
Ensure the aircraft flight manual, and su orting documents are available and
accessible in flight.
Check all required emergency equi ment for condition, location, and
serviceability.
Perform a visual ins ection of the anel from right to left to ensure all
instruments and equi ment are in order, including the following items.
Control lock – REMOVE
Ignition switch – OFF
Lights – OFF exce t beacon
Master switch – ON
Fuel quantity – CHECK
Fla lever – full DOWN (electrical)
Master switch – OFF
Fuel selector valve – CORRECT TANK
G1000 Mo els
Additionally for G1000 equi ed aircraft the following items need to be checked
after selecting the master switch on:
Ensure PFD dis lay visible, check the required annunciators are dis layed.
Confirm both avionics fans are o erational – turn on each of the avionics buses
se arately and confirm the fan can be heard.
Turn the master switch OFF
Test the standby battery – hold in the TEST osition for a rox 20 seconds
ensure green light remains on. (This test is described before start in the POH,
however if the standby bettery is required for flight it is referable to com lete
the test now).
C172RG
Confirm gear is down before turning master switch on.
Operational Check of Lights
Before turning the master switch off, if lights are required, switch all lights on,
confirm visually that all are o erational, then turn all off again exce t beacon.
This is required for a night flight and a good idea for all flights.
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CESSNA 172 TRAINING MANUAL
Exterior Inspection
Visually check the air lane for general condition during the walk-around
ins ection, ensuring all surfaces are sound and no signs of structural damage,
worked rivets, missing screws, lock wires or loose connections.
Tail Section
Check to , bottom, and side surfaces
for any damage, ensure balance weights
and fairings secure.
Ensure elevator and trim secure and
undamaged, linkages free and
unobstructed, check full and free
movement of elevator.
Check rudder linkages and turn-buckles
secure, unobstructed, and elevator has
free movement (do not check full
movement with nose wheel on the
ground).
Check lower tail and tie down for any
sign of tail strike.
Check beacon, aerials and rear
navigation light undamaged and
secure.
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