FIGURE 4-53
360 ft (109,7 m)
Boom
380 ft (115,8 m)
Boom
#55-79A Boom Intermediate Suspension
for 100 ft (30,5 M) mast
19
22
23
24
22
21a
23
24
24
19
400 ft (121,9 m)
Boom
See Figure 4-45
21a
19
22
23
24
21b
19
21a
21b
21b
22
23
24
24
24
340 ft (103,6 m) &
360 ft (109,7 m)
Boom
380 ft (115,8 m)
Boom
400 ft (121,9 m)
Boom
See
Figure 4-45
420 ft (128,0 m)
Boom
Item Description Item Description
19 Adjustable Link 22 Pin, Pendant with Cotter pin
20 Pin, 2-1/4 x 8-3/8 in (57 x 213 mm)
with Snap Pins
23 Pendant, 6 ft (1,8 m)
21a Pendant, 12 ft, 2-3/4 in (3,7 m) 24 Pin, 2-3/4 x 5-3/4 in (70 x 146 mm)
with Cotter Pin
21b Pendant, 10 ft, 9-1/4 in (3,3 m)
#55-79A Boom Intermediate Suspension
for 140 ft (42,7 M) Mast
20
Pin to
TOP
Holes
20
Pin to
TOP
Holes
20
Pin to
BOTTOM
Holes
20
Pin to
TOP
Holes
21a
Components are identical on
both sides of boom sections.
4-190
4-191