TM 10-5411-201-14
T.O. 35E4-178-1
4-42.
(cont)
i.
Depending on replacement insert size, select a drill bit from sizes
listed below.
After drilling small holes around periphery of insert, the
remaining hole will be much larger than the recommended drill size.
Insert Outside
Diameter
Drill Size
Insert Thread Size
inches (mm)
inches (mm)
1/4-28
0.437 (11.1)
29/64 ± 0.010 (11.5 ± 0.25)
5/16-24
0.500 (12.7)
33/64 ± 0.010 (13.1 ± 0.25)
10-32 & 3/8-16
0.562 (14.3)
37/64 ± 0.010 (14.7 ± 0.25)
1/4-28 & 5/16-24
0.687 (17.5)
45/64 ± 0.010 (17.9 ± 0.25)
3/8-24
0.750 (19.1)
49/64 ± 0.010 (19.5 ± 0.25)
j.
Using selected drill bit, drill through panel skin to approximate
depth of insert to be installed.
NOTE
Take care not to drill through opposite skin.
k.
Install long end of Allen wrench into drill chuck and insert short
end in predrilled hole and remove additional honeycomb core to one inch (2.54
mm) in diameter.
Leave from 1/8 in. (3.2 mm) to 1/4 in. (6.4 mm) of core at
bottom of hole.
1.
Remove loose honeycomb and foam insulation, if applicable, from
hole.
m.
Degrease insert by cleaning with solvent (Item 20, Appendix E).
NOTE
After cleanlng, handle insert with clean,
white gloves (Item 11, Appendix E).
n.
Mask skin area around hole with masking tape (Item 22, Appendix E)
approximately 3“ x 3“.
4-181
