Cessna T188C - Page 75

MODEL 188
& T188 SERIES
SERVICE
MANUAL
4-5. REPAIR.
- Repair
of a
damaged wing
panel
may
d. Test-fly
airplane.
If wing-heavy
condition
still
be accomplished in accordance
with instructions given exists,
remove fairing strip on "lighter"
wing. loosen
in Section
17.
Extensive
repairs of
wing skin
or struc-
nut. and
rotate
bushings simultaneously
until bush-
ture are
best accomplished
by using
the wing repair
ings are
positioned
with thick
side of eccentric
down.
jig, which
may be obtained
from
Cessna.
The Jig
This
will raise
trailing
edge of wing,
thus increasing
serves
not only
as a holding
fixture,
making
work on
wing
heaviness
to
balance
heaviness
in opposite
wing.
the wing
easier, but
also assures absolute
alignment
e. Tighten
nut, install
fairing strip,
and repeat
of
the repaired
wing.
test flight.
4-6.
INSTALLATION.
4-8. WING
STRUT. (See
figure 4-2.)
a Hold wing in position and install bushings, bolts,
washers
and nuts attaching
wing spars
to stub wing
4-9. DESCRIPTION.
Each
wing has a single
wing
fittings.
strut which transmits
a part
of the wing load
to the
b. Install wing
strut at fuselage
fitting and wing
upper
portion of the
fuselage. The
strut consists
of
fitting,
then
install jury
strut.
Check straightness
a
streamlined
tube riveted
to two
end fittings
for
of strut per
figure 4-2.
attachment
at the fuselage
and
wing. The
strut is
c. Install
upper and
lower strut
fairings.
braced
by a jury
strut.
d. Route
flap
and aileron
cables.
e. Connect
electrical wires
at quick-disconnects.
4-10.
REMOVAL AND
INSTALLATION.
f. Connect
fuel lines
and cross-over
vent line, if
a. Remove
bolts and
nuts securing jury
strut.
installed.
b. Remove
screws securing
strut fairings
and re-
g. Connect
pitot
line (if left
wing is
being installed).
move fairings.
h. Rig aileron
system (Refer
to Section
6).
c. Support
wing securely.
Remove nut and
bolt
i. Rig flap
system (Refer
to Section
7).
securing
strut to wing.
J.
Refuel wing cells
if installed,
and check for
d.
Remove nut and
bolt securing
strut to fuselage
leaks.
and remove
strut.
k. Check
operation of
all lights.
e. Reverse
the preceding
steps for installation.
1. Install
wing gap
fairings and
inspection plates.
Check
straightness
of strut per
figure 4-2.
m.
Connect any
agricultural equipment
previously
disconnected
to
remove
wing.
4-7. ADJUSTMENT
(CORRECTING
"WING-HEAVY"
4-11.
REPAIR
CONDITION).
If considerable control
stick pressure a. For
grooves in wing strut caused
by strut fair-
is required
to keep
wings level
in normal
flight, a
ings, the
following
applies.
wing-heavy
condition exists.
1. If groove
exceeds .010
inch in depth
and is
a. Remove
wing fairing
strip on the wing-heavy
less than
. 75 inch from
a rivet center,
the strut
side
of aircraft,
should
be
replaced.
b. (See
figure 4-1.) Loosen
nut (10) and
rotate
2. If groove
is more than
. 75 inch from
a rivet
bushings
(7) simultaneously until
bushings are posi- center
and groove depth exceeds .
025 inch, strut
tioned with thick side of eccentrics up. This will should be replaced.
lower
trailing edge of the wing, and
decrease wing 3.
If groove depth is less than .
025 inch and is
heaviness by increasing wing angle-of-incidence. more than .75 inch from a rivet center, strut should
be repaired
by tapering
gradually to
the original
sur-
CAUTION
lace and burnishing
out to a smooth
finish. The local
area
should be checked
with dye penetrant
to insure
Be sure
to rotate the
eccentric
bushings
that no crack
has developed.
simultaneously. Rotating them separately 4. Apply brush alodine or zink chromate primer
will destroy the alignment between the off- and repaint area.
center
bolt holes in
the bushings,
thus ex-
erting a shearing force on the bolt, with NOTE
possible
damage
to the hole
in the wing
spar.
If a wing
strut is badly
dented,
cracked or
c. Tighten nut and reinstall fairing strip. deformed, it should be replaced.
Revision 1 4-3