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Structural repair methods used must be made in accordance with the regulations set forth in FAA Advisory Circular 43-13-1A. To assist in making repairs and/or replacements, Figure 51-1 identifies the type and thickness of various skin material used.  The New Piper Aircraft, Inc. recommends using new Genuine Piper replacement parts when at all possible to affect repairs.
— WARNING —
NO ACCESS HOLES ARE PERMITTED IN ANY CONTROL SURFACES. THE USE OF PATCH PLATES FOR REPAIRS OF ALL MOVABLE TAIL SURFACES IS PROHIBITED.  THE USE OF ANY FILLER MATERIAL NORMALLY USED FOR REPAIR OF MINOR DENTS AND/OR MATERIALS USED FOR FILLING THE INSIDE OF SURFACES IS ALSO PROHIBITED ON ALL MOVABLE TAIL SURFACES.
Never make a skin replacement or patch plate from material other than the type of the original skin, or of a different thickness than the original skin.  The repair must be as strong as the original skin. However, flexibility must be retained so the surrounding areas will not receive extra stress.
FIBERGLASS REPAIRS
The following repair procedures describe repair methods for fiberglass reinforced structures, fiberglass touch-up and surface repairs (blisters, open seams, delamination, cavities, small holes, and minor damages) that have not harmed the fiberglass cloth material, and fiberglass fracture and patch repairs (puncture, breaks, and holes that have penetrated through the structure and damaged the fiberglass cloth).  A repair kit, part number 766 222 gives necessary material for such repairs, and is available from Piper Aircraft dealers.
—CAUTION—
FOLLOW RESIN AND CATALYST MIXING INSTRUCTIONS FUNISHED WITH REPAIR KIT.
— Note —
Polyester resin has a limited storage life. The material should not be used if gelatin or hard lumps are found in container.  Storage life may be extended by refrigeration.
— Note —
The following repairs are not intended for use on glue joints.
51-10-00 Page 51-5 Revised: February 28, 2002

NO. OF SKIN  MATERIAL  THICKNESS 
1  2024-T3  0.016 
2  2024-T3  0.020 
3  2024-T3 (1)  0.020 
4  2024-T3  0.025 
5  2024-T3  0.032 
6  2024-T3 (1)  0.032 
7  2024-T3  0.040 
8  2024-T3  0.051 
9  5052-H34  0.040 
10  BONDOLITE Z-3A  0.125 
11  THERMOPLASTIC  0.125 
12  THERMOPLASTIC  0.93 
13  THERMOPLASTIC  0.062 
14  FIBERGLASS 
15  2024-T3  0.050 
16  GALVANIZED STEEL  0.018 
17  5052-H34  0.032 
(1) HEAT TREAT TO 2024-T42 
AFTER FORMING. 
Figure 51-1. Skin Material and Thickness  (Sheet 1 of 2) 
51-10-00 
Page 51-6 
Issued: April 1, 1997 
3B18 

Figure 51-1. Skin Material and Thickness  (Sheet 2 of 2) 
3B19  51-10-00 Page 51-7 Issued: April 1, 1997 

MINOR SCRATCH AND CRACK REPAIR

1.  
Remove wax, oil, and dirt from around damaged area with acetone, methylethylketone, or equivalent and remove paint to gel coat.

2.  
Scrape damaged area with a fine blade knife or a power drill with burr attachment to roughen bottom and sides of damaged area. Feather edge surrounding scratch or cavity.  Do not undercut edge. (If scratch or cavity is shallow and penetrates only the surface coat, continue to step 2, b.)

3.  
Pour a small amount of resin into a jar lid or on a piece of cardboard, enough to fill damaged area. Mix equal amount milled fiberglass with resin, (use a putty knife or stick.  Add catalyst per kit instruction, to resin and mix thoroughly.  Use a hypodermic needle to inject gel into small cavities not requiring fiberglass millings mixed with gel.

4.  
Work mixture of resin, fibers, and catalyst into damaged area.  Use sharp point of putty knife or stick to press it into bottom of hole and puncture any air bubbles.  Fill scratch or hole above surrounding undamaged area about 0.062 (1/16) of an inch.

5.  
Lay a piece of cellophane or waxed paper over repair to block air and start cure of gel mixture.

6.  
Allow gel to cure 10 to 15 minutes until it is rubbery to touch.  Remove cellophane and trim flush with surface, using a sharp razor blade or knife.  Replace cellophane and cure completely for 30 minutes to an hour.  Patch will shrink below structure surface as it cures.  (If wax paper is used, check wax is removed from surface.)

HOLE REPAIR
1.  
Rough up hole bottom and edges with electric burr attachment or rough sandpaper.  Feather hole into surrounding gel coat, do not undercut.
　
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