Piper Comanche PA-24 Service Manual page 226

4-43b. Metal Wire Stitching Repair. (See Figure 4-7b.)
CAUTION: METAL/WIRE STITCHING (AND THE ALTERNATE METHOD OF JOINING
DESCRIBED BELOW) SHALL ONLY BE USED FOR NON-STRUCTURAL, NON-
LOAD CARRYING APPLICATIONS.
A metal/wire stitching process is used to staple fabric and rubber seal materials to engine baffles and
some composite materials. The following alternate method of joining is approved for field use when
replacing these fabric and rubber seal materials.
Alternate (Rivet) Method of Joining.
(1) Substitute two rivets in lieu of each staple where stitching was previously used or is specified.
Maintain a minimum of .75 inch spacing between rivets.
(2) When materials being joined include Stainless Steel, Galvanized Steel or Steel, use:
(a) MS20615M4 Rivet (Monel) and NAS1149CN432R Washer (See Figure 4-7b.)
(b) Install with manufactured (factory) head against hardest material. Install washer against
opposite side of joint and upset rivet (bucktail) against washer.
(3) When materials being joined include only aluminum and nonmetallic materials use:
(a) MS20470A4 Rivet and NAS1149DN432H Washer (See Figure 4-7b.)
(b) Install with manufactured (factory) head against hardest material. Install washer against
opposite side of joint and upset rivet (bucktail) against washer.
IV - STRUCTURES
PIPER SENECA SERVICE MANUAL
1E18F
(PIR-PPS20024, Rev. A.)
04/01/09