Cessna 1969-1976 172 Series User manual

172
AND
SKYHAWK
SERIES
1969 THRU 1976
SERVICE MANUAL
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OF PREVIOUS DATE
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D972C3-I3-RAND-1 750-7175
1 JULY 1972
CHANGE 3 15 JUNE 1975

INSERT LATEST CHANGED PAGES . DESTROY SUPERSEDED PAGES .
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Upon receipt of the second and subsequent changes to this book. personnel
responsible
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that all previous changes have been received and incorporated
.
The asterisk indicates pager changed. added . or deleted by the current change .

TABLE OF C
SECTION
Page
1 GENERAL DESCRIPTION ....................... 1-1
2 GROUND HANDLING. SERVICING. CLEANING. LUBRICATION AND
INSPECTION
............................ 2-1
3 FUSELAGE
............................. 3-1
4 WINGSANDEMPENNAGE
....................... 4-1
5 LANDING GEAR AND BRAKES
..................... 5-1
6 AILERON CONTROL SYSTEM
..................... 6-1
7 WING FLAPCONTROL SYSTEM
.................... 7-1
8 ELEVATOR CONTROL SYSTEM .................... 8-1
9 ELEVATOR TRIM TAB CONTROL SYSTEM ............... 9-1
10 RUDDER CONTROL SYSTEM ..................... 10-1
11 ENGINE (LYCOMING "BLUE-STREAK") ................ 11-1
11A ENGINE (CONTINENTAL) ....................... 11A-1
12 FUELSYSTEM
............................ 12-1
13 PROPELLER ............................ 13-1
14 UTILITY SYSTEMS
.......................... 14-1
15 INSTRUMENTS AND INSTRUMENT SYSTEMS
.............. 15-1
16 ELECTRICAL SYSTEMS
........................ 16-1
17 ELECTRONIC SYSTEMS (DELETED) (See
Page iii) ...........
18 STRUCTURAL REPAIR ........................ 18-1
19 PAINTING .............................. 19-1
20 WIRING DIAGRAMS
.......................... 20-1
I
Change 3 i

CROSS REFERENCE LISTING OF POPULAR
NAME
VS. MODEL NUMBER AND SERIALS
All aircraft, regardless of manufacturer,
are certificated under model number designations. However,
popular names
are often used for marketing purposes. To provide a consistent method of referring to the
various aircraft, model numbers will be used in this publication unless names
are required todifferentiate
between versions of the same basic model. The following table provides
a cross reference listing of popular
name vs. model numbers.
POPULAR NAME
172 or SKYHAWK
172, SKYHAWK
or
SKYHAWK I1
SKYHAWK or
SKYHAWK II
REIMS 172
REIMS/C ESSNA ~172
RE IMS IC E SSNA F 1 7 2
SKYHAWK, SKYHAWK
I1
MODEL
YEAR
~~~ ~
1969
1970
1971
1972
1973
1974
1975
1976
1969
1970
1971
1972
1973
1974
1975
1976
MODEL
172K
172K
172L
172L
172M
172M
172M
172M
F172H
F172H
F172K
F172L
F172M
F172M
F172M
F 172M
SERIALS
BEGINNING ENDING
17257162
17258487
17259224
17259904
17260759
17261899
17263459
17265685
17258486
17259223
17259903
17260758
17261898
17263458
17265684
F17200560
F17200655
F17200755
F17200805
F 17200905
F1720103
5
F17201235
F 17201385
F17200654
F17200754
F17200804
F 17200904
F17201034
F17201234
F 17201384
ii Change 3

FOREWORD
This manual contains factory recommended procedures and
instructions for ground handling, servicing and maintaining
Cessna Model 172-Series aircraft. This includes the Models
172, Skyhawk, Reims 172 and Reims/Cessna F172. The Reims
versions
of the Model 172 and Skyhawk are identical to the Model
172 and Skyhawk, through Model year 1971, except that they
are
powered by 0-300-D Rolls Royce engines. Beginning with the
1972 Models, both 172 and F172-Series aircraft
are powered by
"Blue- Streak" (Lycoming) engines. Besides serving
as a refer-
ence for the experienced mechanic, this manual also covers
step-by-step procedures for the
less experienced man. This
manual should
be kept in a handy place for ready reference. If
properly used,
it will better enable the mechanic to maintain
Cessna 172-
Series aircraft and thereby establish a reputation
for
reliable service.
The information in this manual
is based on data available at
the time of publication, and
is supplemented and kept current
by service letters and service news letters published by Cessna
Aircraft Company. These
are sent to all Cessna Dealers so that
they have the latest authoritative recommendations for servicing
Cessna aircraft. Therefore, it
is recommended that Cessna owners
utilize the knowledge and experience
of the factory-trained Dealer
Service Organization.
In addition to the information in this Service Manual,
a group
of Vendor publications
is available from the Cessna Service Parts
Center which describe complete disassembly, overhaul, and parts
breakdown
of some of the various vendor equipment items. A listing
of the available publications
is issued periodically in service letters.
Information for Nav-0-Matic Autopilots, Electronic Communi-
cations, and Navigation Equipment
are not included in this manual.
These manuals
are available from the Cessna Service Parts Center.
iii/(iv blank)

Thispage intentionally left blank.

SECTION 1
GENERAL DESCRTPTION
TABLE OF CONTENTS Page
GENERAL DESCRIPTION
.......... 1-1
Model 172-Series. ........... 1-1
Description ............. 1-1
1-1. GENERAL DESCRIPTION.
1-2. MODEL 172-SERIES.
1- 13. DESCRIPTION. Cessna Model 172 Series
aircraft, described in
this manual, are high-wing
monoplanes of all-metal, semimonocoque construct-
ion. These aircraft are equipped with
a fixed tri-
cycle landing gear. Thru 1970 Models, they are
equipped with
flat spring-steel main landing gear
struts. Eeginning with 1971 Models, these aircraft
are equipped with tubular spring-steel main gear
struts. The steerable nose gear
is equipped with an
air/hydraulic fluid shock strut. Four-place seating
is standard, and a double-width, fold-up auxiliary
rear seat may be installed
as optional equipment.
Thru 1971Models, F172-Series aircraft areequip-
ped with six-cylinder air-cooled 0-300-Series, Con-
tinental engines, manufactured under license by
Rolls Royce. Model 172-Series aircraft, andF172-
Series aircraft, beginning with 1972Models, are
powered by four-cylinder, horizontally opposed,
air-
cooled "Blue Streak" (Lycoming) engines.
the engines drives are all-metal, fixed-pitch pro-
Each of
Aircraft Specifications
......... 1-1
Stations ................ 1 - 1
Torque Values ............. 1-1
peller. Model 172-Series aircraft feature rear side
windows,
a "wrap-around" rear window and a swept-
back fin and rudder.
1-4. AIRCRAFT SPECIFICATIONS. Leading parti-
culars of these aircraft, with dimensions based on
gross weight, are given in figure
1-1. If these di-
mensions areused for constructing
a hangar or com-
puting clearances, remember that such factors
as
nose gear strut inflation, tire pressures, tire sizes
and load distribution may result in some dimensions
that are considerably different from those listed.
1-5. STATIONS, Station diagrams areshown in fig-
ures
1-2 and 1-3 to assist in locating equipment when
a written description is inadequate or impractical.
1-6. TORQUE VALUES. A chart of recommended
nut torque values
is shown in figure 1-4. These tor-
que values are recommended for
all installation pro-
cedures contained in this manual, except where other
values are stipulated. They are not to be used for
checking tightness of installed parts during service.
1-1

........................
GROSSWEIGHT 23001b NOTE
FUEL CAPACITY
Standard Wing (Total)
.................... 42 gal. These specifications are
LOng-mnge Wing (Total) .................. 52 gal. and F172-Series aircraft,
Long-Range Wing (Usable).
................. 48 gal. except as indicated.
(Without External
Filter) .................. 8 qt
(With External Filter).
................... 9 qt
Standard Wing (Usable)
................... 38 gal. applicable to both Model 172
OIL CAPACITY
ENGINE MODEL
172-Series(Refer to Section
11 for Engine Data) ........ LYCOMING 0-320 Series
F172-Series (Refer to Section 11A thru 1971Models).
..... CONTINENTAL 0-300 Series
F17P-Series (Refer to Section
11 Beginning with 1972 Models).
. LYCOMING-0-320 Series
PROPELLER (Fixed Pitch)
................... 76" MCCAULEY
MAIN WHEEL TIRES
...................... 6.00 x 6, 4-Ply Rating
Pressure (Thru 1970 Models)
................ 24 psi
Pressure (Beginningwith 1971Models)
............ 29 psi
NOSE WHEEL TIRE (Standard)
................. 5.00 x 5, 4-Ply Rating
Pressure (Thru 1970 Models)
................ 26 psi
Pressure (Beginningwith 1971Models)
............ 31 psi
NOSE WHEEL TIRE (172-Series Only, Optional)
.......... 6.00 x 6, 4-Ply Rating
Pressure
......................... 26 psi
Camber.
......................... 3" to 5"
Toe-In .......................... 0" to .06"
Camber
.......................... 2" to 4"
Toe-In
......................... 0" to .18"
up.. .......................... 20"*1"
Down..
......................... 15"*l0
(Thru 1972 Models).
.................... 0" to 40" * 2"
(Beginningwith 1973 Modelsb ................ 0" to 40°, +Oo -2O
Right ........................... 16' 10'*1"
Left
........................... 16' 10' *lo
Right ........................... 17' 44'*1"
Left
........................... 17' 44'51'
Up..
.......................... 28", +1"-0"
Down
........................... 23", +I" - 0"
Up.. .......................... ?Bo, +1"-0"
Down
........................... 13", +lo - 0"
Wing Span (Conventional Wing Tip) ..............
Wing Span (Conical-Camber Wing Tip) ............ 35' 10"
Wing Span (Conical-Camber With Strobe Lights)
........
Tail Span ......................... 11'
Length .......................... 26' 11"
Flashing Beacon Installed on Fin ............. 8' - 9 1/2"
Track Width (Thru 1970 Models) ............... 7' 2"
Track Width (Beginning with 1971Models).
8' - 3 1/2"
BATTERY LOCATION.
..................... Firewall
NOSE GEAR STRUT PRESSURE (StrutExtended).
......... 45 psi
WHEEL ALIGNMENT (Flat Spring Struts)
WHEEL ALIGNMENT (Tublar Spring Struts
* (Tubular Gear is non-adjustable)
AILERON TRAVEL
WING FLAP TRAVEL
RUDDER TRAVEL (Measuredparallel to water line)
RUDDER TRAVEL (Measuredperpendicular to hinge line)
ELEVATOR TRAVEL
ELEVATOR TRIM TAB TRAVEL
PRINCIPAL DIMENSIONS 36'
2"
36'
Fin Height (Maximum with Nose Gear Depressed and
..........
* No provisions are made for aligning wheels on tubular gear aircraft.
The tolerances provided
are to be used only for checking existing
wheel alignment.
Figure
1-1. Aircraft Specifications
1-2 Change
2

O. 0°1
BEGINNING WITH 1972
r
8:12
56.70
3.375
-
\ m
16.66 65.33 205.81 / / /
BEGINNING WITH 1971
WHEEL FAIRINGS THRU 1973 MODELS
8.12
44.00 I 80.00
56.70
4
STATIO
F172 SERIES
THRU 1971
I\ 6,
WHEEL FAIRINGS BEGINNING WITH 1974 MODELS
NS REMAIN THE SAME
172-SERIES AND F172-SERIEI
BEGINNING WITH 1972
Figure 1-2. Reference Stations
Change 1 1-3

23.62
I 39.00
Figure 1-3. Wing Stations
SHOP NOTES:
1-4