Piper SEMINOLE PA-44-180, Maintenance Manual

Page: 558 / 881

Figure 51-4. Deep Scratches, Shallow Nicks and Small Holes
Figure 51-5. Mixing of Epoxy Patching Compound
I. The welding method requires a hot air gun and ABS rods. To weld, hold gun to direct the flow of
hot air into repair zone. Heat damaged area and rod simultaneously. Move the gun continuously
in a fanning motion to prevent discoloration of material. Pressure must be maintained on rod to
ensure good adhesion (Refer to Figure 51-6).
J. After repair is complete, sand to obtain a good surface finish.
4. CRACKS: (Refer to Figure 51-7)
A. Before repairing a crack in thermoplastic parts, first determine what caused crack and alleviate
condition to prevent it from recurring.
B. Drill small stop holes at each end of crack.
C. If possible, bond a double plate to reverse side of crack to provide extra strength.
D. The crack should be V grooved and filled with repair material such as solvent cement, hot melt
adhesive, epoxy patching compound, or hot air weld.
E. After repair has cured, sand to match surrounding finish.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
51-13-04
Page 51-10
Revised: June 20, 1995
2L18