Cessna T188C - Page 371

MODEL 188
& T188 SERIES
SERVICE
MANUAL
17-38A. CRACKS IN CORRUGATED
AILERON SKINS
(Continued from page 17-10)
1. It is permissible to stop drill
crack(s) that originate at the
trailing edge of the control surface
provided the
crack
is not more
than 2 inches
in length.
2.
Stop drill crack
using a #30
(128 inch)
drill.
3.
A crack may
only be stop
drilled once.
NOTE: A crack that passes through a trailing edge rivet and does not extend to the trailing edge of the
skin may be stop drilled at both ends of the crack.
4. Any control surface
that has a crack that progresses
past a stop drilled hole
shall be repaired. Refer to
paragraphs 17-38,
-39, and -40
as applicable for repair
information.
5. A control surface
that has any of the following conditions
shall have a repair made
as soon as practicable:
A. A crack that is longer than 2 inches.
B. A crack
that does not originate
from the trailing edge or a
trailing edge rivet.
C. Cracks in more
than six trailing
edge rivet locations
per skin.
Refer to paragraphs
17-38, -39, and -40
as applicable for repair
information.
6. Affected control surfaces with corrugated skins and having a stop drilled crack that does not extend past
the stop drilled hole, may remain in service without additional repair.
17-42A. CRACKS IN CORRUGATED FLAP SKINS (Continued from page 17-10)
1. It is permissible to
stop drill crack(s) that originate
at the trailing edge of the control
surface provided the
crack is not more than 2 inches in length.
2.
Stop drill crack
using a #30
(.128 inch)
drill.
3. A crack may only be stop drilled once.
NOTE: A crack that passes through a trailing edge rivet and does not extend to the trailing edge of the
skin may be
stop drilled at
both ends of
the crack.
4. Any control surface that has a crack that progresses past a stop drilled hole shall be repaired. Refer to
paragraphs
17-42, -43, and
-44 as applicable
for repair information.
5. A control surface that has any of the following conditions shall have a repair made as soon as practicable:
A. A crack that is longer than 2 inches.
B. A crack
that does not
originate from
the trailing
edge or a trailing
edge rivet.
C. Cracks in more than six trailing edge rivet locations per skin.
Refer to paragraphs 17-42, -43, and -44 as applicable for repair information.
6. Affected
control surfaces with corrugated
skins and having a stop
drilled crack that does not extend
past
the stop drilled hole, may remain in service without additional repair.
Temporary Revision Number
3
17-10A
7
January
2000