Posted for "F. Barry Knotts" <bknotts@buckeye-express.com>:

Don't know the number of layers.  But Advisory Circular AC43.13-1B
Acceptable Methods, Techniques, and Practices--Aircraft Inspection and
Repair has a note on the method:
Chapter 3, Section 1, 3-3 Repairing holes,a. Scarf Method, "(6) The
scarfed joint method is normally used on small puctures up to 3 or 4
inches in maximum dimension and in facings that are made of thin fabric
that is difficult to peal."  The next section describes the Step-Joint
method that would be an alternative method or used for a larger defect.

AC43.13-1B is occasionally useful.  I like it. Barry Knotts
LIV-P, Conti TSIO-550 (Probably), 20%, Toledo, Ohio



 > > Can anyone advise me on the number of carbon cloth layers used for the
 > > main wing skins? If one needed to repair puncture damage to a wing skin,
 > > would a scarf-type patch using the same number of layers be adequate if
 > > the damage is not near any internal components-rib or spar? Thanks,  Bob
 > > Pastusek