Cessna 1969-1976 172 Series Service Manual page 318

5.062
l
a.
b. Determine position of doubler on wing skin and center over centerlines. Mark the ten rivet
hole locations and d r i l l to s i z e shown.
Establish exact location for inspection cover and inscribe centerlines.
c . Cutout a c c e s s hole, using dimension shown.
d.
Flex doubler and i n s e r t through a c c e s s hole, and rivet in place.
e. Position cover and s e c u r e , using s c r e w s
as
shown.
/ - ' S-1443-1 DOUBLER
VIEWED FROM INSIDE
WING LOOKING DOWN
AT T O P O F LOWER
# 4 0 ( . 0 9 8 ) HOLE
(10 REQD)
LOWER
WING SKIN
(REF)
5-225-4F COVER
M S 2 0 4 2 6 A D 3 RIVETS NOTE
PARTS ARE AVAILABLE
FROM THE CESSNA
SERVICE PARTS CENTER.
S-10222-8-6 SCREWS
PRECAUTIONS
1. Add the minimum number of access holes n e c e s s a r y .
2.
Any c i r c u l a r o r rectangular a c c e s s hole which
is
used with approved optional equipment installa-
tions may be added in lieu of the a c c e s s hole illustrated,
3. Use landing light installations instead of a c c e s s holes (thru 1970 Models) where possible. Do not
add a c c e s s holes
at
outboard end
of
wing; remove wing t i p instead.
4. Do not add an a c c e s s hole in the s a m e bay where one is already located.
5 . Locate new a c c e s s holes n e a r the center of a bay (spanwise).
6. Locate new a c c e s s holes forward of the front s p a r s
as
close t o the front s p a r
as
practicable.
7 . Locate new a c c e s s holes aft of the front s p a r between the first and second s t r i n g e r s aft of the
s p a r . When installing the doubler, rotate it
s o
the two straight edges a r e closest to the s t r i n g e r s .
8. Alternate bays, with new a c c e s s holes staggered forward and aft of the front s p a r , a r e p r e -
fer
able.
9.
A
maximum of five new a c c e s s holes in each wing is permissible; if more
are required, contact
,
the C e s s n a Service Department.
10. When
a
complete leading edge skin is being replaced, the wing should be supported in such a
1
manner so that wing alignment
is
maintained.
18-32
~~ ~ ~ ~ ~ ~ ~~~ ~~
Figure 18-11. Access Hole Installation