THERMOPLASTIC REPAIRS (Cont.)
4. Cracks: (Refer to Figure 6.)
a. Before repairing a crack in thermoplastic part, first determine what caused crack and alleviate that
condition to prevent it recurring after repair is made.
b. Drill small stop holes at each end of crack.
c. If possible, a double plate should be bonded to reverse side of crack to provide extra strength to
part.
d. Crack should be V-grooved and filled with repair material, such as solvent cement, hot melt
adhesive, epoxy patching compound or hot air welded, whichever is preferred.
e. Affter repair has cured, it may be sanded to match surrounding finish.
5. Repairing Major Damage: (Larger than 1 inch in diameter.) (Refer to figure 7.)
a. If possible a patch should be made of same material and cut slightly larger than section being
repaired.
b. When appearances are important, large holes, cracks, tears, etc, should be repaired by cutting out
damaged area and replacing it with a piece of similar material.
c. When cutting away damaged area, under cut perimeter and maintain a smooth edge. Patch and/or
plug should also have a smooth edge to insure a good fit.
d. Coat patch with solvent adhesive and firmly attach it over damaged area.
e. Let patch dry for approximately one hour before any additional work is performed.
f.
Hole, etc, is then filled with repair material. A slight overfilling of repair material is suggested to
allow for sanding and finishing after repair has cured. If patching compound is used, repair should
be made in layers, not exceeding a 1/2 inch in thickness at a time, thus allowing compound to
cure and insuring a good solid buildup of successive layers as required.
6. Stress Lines: (Refer to figure 8.)
a. Stress lines produce a whitened appearance in a localized area and generally emanate from severe
bending or impacting of material. (Refer to figure 9.)
b. To restore material to its original condition and color, use a hot air gun or similar heating device
and carefully apply heat to affected area. Do not overheat material.
7. Painting the Repair:
a. An important factor in obtaining a quality paint finish is proper preparation of repair and sur-
rounding area before applying any paint.
b. It is recommended that parts be cleaned prior to painting with a commercial cleaner or a solution
made from one-fourth cup of detergent mixed with one gallon of waer.
c. Paint used for coating thermoplastic can be either lacquers or enamels depending on which is pre-
ferred by repair facility or customer. (See NOTE.)
– NOTE –
It is extremely important that solvent formulations be
considered when selecting a paint, because not all lacquers or
enamels can be used satisfactorily on thermoplastics. Some
solvents used in paints can significantly affect and degrade
plastic properties.
d. Another important matter to consider is that hard, brittle coatings that are usually best for abrasion
resistance should not be used in areas which incur high stress, flexing or impact. Such coating
may crack, thus creating a weak area.
PIPER AIRCRAFT
PA-32R-301/301T
MAINTENANCE MANUAL
51-00-00
Page 51-11
Reissued: July 1, 1993
3H10
Summary of Contents for PA-32R-301T SARATOGA S
Page 26: ...CHAPTER 4 AIRWORTHINESS LIMITATIONS 1C1 ...
Page 29: ...CHAPTER 5 TIME LIMITS MAINTENANCE CHECKS 1C4 ...
Page 53: ...CHAPTER 6 DIMENSIONS AND AREAS 1D6 ...
Page 64: ...CHAPTER 7 LIFTING AND SHORING 1D21 ...
Page 68: ...CHAPTER 8 LEVELING AND WEIGHING 1E1 ...
Page 72: ...CHAPTER 9 TOWING AND TAXIING 1E5 ...
Page 76: ...CHAPTER 10 PARKING AND MOORING 1E9 ...
Page 80: ...CHAPTER 11 REQUIRED PLACARDS 1E13 ...
Page 92: ...CHAPTER 12 SERVICING 1F1 ...
Page 126: ...CHAPTER 20 STANDARD PRACTICES AIRFRAME 1G17 ...
Page 127: ...THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 139: ...CHAPTER 21 ENVIRONMENTAL SYSTEMS 1H5 ...
Page 188: ...CHAPTER 22 AUTOFLIGHT 1J7 ...
Page 193: ...CHAPTER 23 COMMUNICATIONS 1J12 ...
Page 203: ...CHAPTER 24 ELECTRICAL POWER 1J22 ...
Page 263: ...CHAPTER 25 EQUIPMENT FURNISHINGS 2A13 ...
Page 269: ...CHAPTER 27 FLIGHT CONTROLS 2A20 ...
Page 332: ...CHAPTER 28 FUEL 2D11 ...
Page 363: ...CHAPTER 29 HYDRAULIC POWER 2E18 ...
Page 404: ...CHAPTER 30 ICE AND RAIN PROTECTION 2G16 ...
Page 470: ...CHAPTER 32 LANDING GEAR 3A13 ...
Page 550: ...CHAPTER 33 LIGHTS 3D24 ...
Page 562: ...CHAPTER 34 NAVIGATION AND PITOT STATIC 3E12 ...
Page 582: ...CHAPTER 35 OXYGEN 3F8 ...
Page 604: ...CHAPTER 37 VACUUM 3G6 ...
Page 616: ...CHAPTER 39 3G18 ELECTRIC ELECTRONIC PANELS MULTIPURPOSE PARTS ...
Page 620: ...CHAPTER 51 STRUCTURES 3G22 ...
Page 636: ...CHAPTER 52 DOORS 3H14 ...
Page 650: ...CHAPTER 55 STABILIZERS 3I4 ...
Page 662: ...CHAPTER 56 WINDOWS 3I16 ...
Page 670: ...CHAPTER 57 WINGS 3I24 ...
Page 688: ...CHAPTER 61 PROPELLER 3J18 ...
Page 704: ...CHAPTER 70 STANDARD PRACTICES ENGINES 3K10 ...
Page 708: ...CHAPTER 71 POWER PLANT 3K14 ...
Page 737: ...CHAPTER 73 ENGINE FUEL SYSTEM 4A13 ...
Page 749: ...CHAPTER 74 IGNITION 4B1 ...
Page 783: ...CHAPTER 77 ENGINE INDICATING 4C11 ...
Page 793: ...CHAPTER 78 EXHAUST 4C21 ...
Page 801: ...CHAPTER 79 OIL 4D5 ...
Page 805: ...CHAPTER 80 STARTING 4D9 ...
Page 819: ...CHAPTER 81 TURBINES 4D23 ...
Page 833: ...CHAPTER 91 CHARTS WIRING DIAGRAMS 4E13 ...