FAA Advisory Circular 43.13-1B
Acceptable Methods, Techniques, and Practices
Aircraft Inspection and Repair
AC 43.13-1B | 4. Metal Structure, Welding, and Brazing | 4. Metal Repair Procedures | 4-62. Selective Plating in Aircraft Maintenance
9/8/98
AC 43.13-1B
THE NUMBER OF RIVETS REQUIRED IN EACH LEG ON EACH SIDE
OF THE CUT IS DETERMINED BY THE WIDTH “W,” THE THICKNESS
OF THE FRAME “t,” AND THE RIVET DIAMETER “d” USING TABLE 4-
10 IN A MANNER SIMILAR TO THAT FOR STRINGERS IN FIGURE 4-
20.
NOTE b. IN TABLE 4-10 INDICATES THAT ONLY 60 PERCENT OF
THE NUMBER OF RIVETS SO CALCULATED NEED BE USED IN
SPLICES IN INTERMEDIATE.
EXAMPLE: (FOR 2017-T3 aluminum alloy frame)
FLANGE LEG
t = .040”
d = 1/8” 2117-T4 (AD)
W1 & W 3 = .6 inch
NO. OF RIVETS PER INCH OF WIDTH
FROM TABLE 4-10 = 6.2
No. of rivets required = W x 6.2 =
.6 x 6.2 = 3.72 or 4 rivets.
60 percent of 4 rivets = 2.4 rivets.
USE 3 RIVETS ON EACH SIDE OF THE
CUT IN EACH FLANGE LEG.
WEB OF ZEE (OR CHANNEL)
t = .040”
d = 1/8” 2117-T4 (AD) rivet
W = 2.0 inches
NO. OF RIVETS PER INCH OF WIDTH
FROM TABLE 4-10 = 6.2
No. of rivets required = W x 6.2 =
2.0 x 6.2 = 12.4 or 13 rivets.
60 percent of 13 rivets = 7.8 rivets.
USE 8 RIVETS ON EACH SIDE OF CUT
IN THE WEB OF ZEE (OR CHANNEL).
“L” SHOULD BE MORE THAN TWICE W2
Thickness of splice plate to be greater than that of the frame to be spliced.
FIGURE 4-20. Example of intermediate frame stringer splice (material 2017-T3 AL alloy).
Par 4-62
Page 4-41