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PIPERAIRCRAFT
PA42-720 (AdvancedTrainer)
MAINTENANCEMANUAL
A. Airfoil -DescriptionandOperation (continued)
Marking and Cutting Scuff RoutingScuff Figure 801 Figure802
Buffing Edge of Repair HoleThroughSurfaceofTube Figure803 Figure804
EFFECTIVITY:
040-999
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Jan 10/9030-10-00
PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
A. Airfoil-Description and Operation (continued)
Rotatingto TubeFabric CuttingSurfaceof Tube
Figure805 Figure806
Cementing BuffedArea and Patch Applyingand StitchingFabric Figure807 Figure808
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PIPER AIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL
A. Airfoil-Description and Operation (continued)
PlacingandStitchingGum RemovingTrappedAir Figure809 Figure810
Masking Repair Figure 811 Applying Neoprene Putty Figure 812
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PIPER AIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCE MANUAL
A. Airfoil -Descriptionand Operation (continued)
(i) Holes or Tears Through Surface Side of Tube Area
(1.) Mark off area and carefully cut 0.010 inch surface ply with knife. Prevent surface ply from peeling beyond markedareawhen using buffer. Ensure area includes full width of tube and approximately 1/2-inchbeyondcut.
(2.) Using buffer, route down to tube fabric. Be careful while using buffer not to loosen surface ply beyond repair area and ensure thattube fabric is not injured. Wash out area. (3.) Cut tube fabric patch slightly larger than cavity size, ensuring fabric stretch is across width of tube. (4.) Cement buffed areaand contact surfaceof tube fabric patch. Apply tube fabric to entire cavityand stitch. Removetrapped air using hypodermicneedle. Roll up small piece of
0.005inch gum (about 1/32-inch diameterand 3/4-inch long) and work in around edge of
tube fabric using sharp pointed object (shears, etc). Stitch gum and cure for 20 minutes. (5.) Scratch shine off gum using Carborundum
stick. Buff surface ply 1/8-inch around repair. Washrepairedareaand apply cement.
(6.) Mask off 1/16-inch beyond repair. Using mill or putty knife, apply Neopreneputty filling cavity flush with surface. Ensurecavity is completely filled. Removemaskingtapeand cure for 15 to 20 minutes.
(7.) Restore conductive surface.
(j) Holesor Tears Through Backsideof Tube Area
(1.) Route off coating down to fabric at least 3/4-inch beyond cut, wash entire buffed area and cement. (2.) Cut fabric patch, wash, cement, apply fabric patch, and stitch. Remove trapped are using hypodermic needle. (3.) Wash and cement repaired area, apply thin coat of Neoprene putty with mill knife and cure for 22 minutes.
(k) Holesor Tears ThroughTwoSide
Repairone side at a time referring to paragraphs titled Holes or Tears Through SurfaceSide of Tube Area and Holes or Tears Through Backside of Tube Area in this chapter.
(I) Hole Through Deicer Extending from One Tube into Another
(1.) Route and buff one side at a time.
(2.) Working on surface side, route in between tube tape 3/4-inch in each direction from tear.
Route out in between tube fillet. Do not damage tube fabric wall. (3.) Slit fabric on backside of deicer, in between tubes, and 3/4-inch beyond tear. (4.) Cut two fabric patches to extend 1/2-inch beyond tear. Ensure stretch of fabric patches
are with width of tube. (5.) Wash and cemententirebuffed area of deicer and one side of fabric patches. (6.) Apply patches for each tube, insertingeach patch through slit, with uncemented patches
sides back to back. Stitch each patch to surface side first. Tension other ends slightly and
stitch on backside. (7.) Wash and cement exposed surfacesof fabric patches. (8.) Replace gum in between tubes and apply patch to backside. (9.) Mask off the repaired area on surface side. Fill flush with Neoprene putty. (10.)Curesurfacesidefirst for 22 minutes and backside for 10 minutes. (11.)Restoreconductivesurfaceon surface side of boot.
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PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
A. Airfoil-Description and Operation (continued)
(m)HoleThrough Deicer Outside of Tube Area
(1.) Repair surface side and patch backside (seeparagraphtitledHoles or Tears Through Backsideof Tube Area).Cure complete repairfor 22 minutes. Restoreconductive surface(see paragraph titled Resurfacing ConductiveCement).
11.Installation
Thefollowing procedure for installing deicersrequiresthatairplanehave provisions forair connections,etc.
(a) Preparationof Leading Edges
If leading edges are painted, removeall paint including zinc chromate primer.
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