IV - STRUCTURES 04/01/09
1E22
PIPER COMANCHE SERVICE MANUAL
N. Using dry 80 grit sandpaper on a power sander or sanding block, smooth patch and blend with
surrounding surface. Should air pockets appear while sanding, puncture and fill with catalyzed
resin. A hypodermic needle may be used to fill cavities. Let cure and resand.
O. Mix catalyzed resin and work into patch with fingers. Smooth carefully and work into any crevices.
P. Cover with cellophane and squeegee smooth. Allow to cure completely before removing
cellophane. Let cure and resand.
Q. Brush or spray a coat of catalyzed resin to seal patch. Sand patch, finish by priming, again sanding
and applying color coat.
NO
TE
: Brush and hands may be cleaned in solvents such as acetone or methylethylketone. If
solvents are not available, a strong solution of detergent and water may be used.
4-47. Structural Repairs.
W
ARNING: NO ACCESS HOLES ARE PERMITTED IN ANY CONTROL SURFACES.
W
ARNING: THE USE OF PATCH PLATES FOR REPAIR OF ALL MOVABLE TAIL SURFACES IS
PROHIBITED. USE OF ANY FILLER MATERIAL NORMALLY USED FOR REPAIR
OF MINOR DENTS AND/OR MATERIALS USED FOR FILLING INSIDE OF
SURFACES IS ALSO PROHIBITED ON ALL MOVABLE TAIL SURFACES.
CA
UTION: CONTROL SURFACE SKINS MUST BE REPLACED IF THEY SUSTAIN DAMAGE
OR EXHIBIT CRACKS.
Structural repair methods used must be in accordance with the regulations set forth in FAA Advisory
Circular 43.13-1, latest revision. To assist in making repairs and/or replacements, Figures 4-8 thru 4-13
identify type and thickness of various skin material used. Never make a skin replacement or patch plate
from material other than type of original skin, or of a different thickness than original skin. Repair must
be as strong as the original skin. However, flexibility must be retained so the surrounding areas will not
receive extra stress.
Repairs to areas defined in FAR Part 43, Appendix A, must be shown (using approved data) to not
diminish the Life of the component, if a life limit is stated herein (see Section I). Temporary repairs,
when required, must add Instructions for Continued Airworthiness (ICA) to the maintenance record. Any
such ICA must be based on approved data.
4-48. Repair of Stabilator (Horizontal Tail Surface).
W
ARNING: DURING THE COURSE OF ANY REPAIR WORK BEING ACCOMPLISHED ON THE
STABILATOR, THE COMPLETE STABILATOR, STABILATOR TRIM TAB AND TRIM
TAB MECHANISM SHOULD BE CHECKED FOR "FREE PLAY " REFER TO
PARAGRAPH 4-50 FOR COMPLETE DETAILS ON CHECKING FOR FREE PLAY.
W
ARNING: NO REPAIRS TO THE STABILATOR TRIM TAB ASSEMBLY ARE ALLOWED,
OTHER THAN REPLACEMENT OF HINGES AND PAINTING. SHOULD TABS
REQUIRE REPAIRS OTHER THAN THOSE STATED ABOVE, REPLACE WITH NEW
PARTS.
Repairs are limited to replacement of complete skin sections, ribs, hinges, spars, etc. and paint.
Precautions must be taken when performing any maintenance and or repairs to the stabilator and
stabilator trim tabs. Repairs must be made in a manner that maintains the original configuration,
strength, stiffness and weight distribution.
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