TM 10-1670-201-23
T.O. 13C-1-41
NAVAIR 13-1-17
wire spring and lock the stitching at each end by making
(7) Reinstall the two locking screws removed
a concentration of hand-stitches.
in (1) above and tighten each screw using a suitable
sized flat-tip (commonhead) screwdriver.
b. Replacement. A pack opening spring band that
has lost elasticity or which is damaged beyond repair will
3-31. Pack Opening Spring Band
be replaced with a serviceable item from stock and the
A pack opening spring band (fig. 3-34) consists of
following procedures:
five parallel steel wire springs enclosed in a puckered
nylon sheath with a pull-tab and a hook located at each
(1) If applicable, cut original stitching and
end. The ends of each spring are permanently affixed
remove or lay aside any item that may interfere with
to the end hooks. The sheath length covering the
replacement accomplishment.
In addition, cut the
springs passes through the hook at each end, and when
tacking securing the unserviceable pack opening band
folded back and handstitched in place, forms the end
to the pack, as required.
pull-tabs. Repair or replace a damaged pack opening
(2) Disconnect each end hook of the affected
spring band using the following procedures, as
band from the attaching hookeyes and remove the band
applicable.
from the pack.
(3) Install a serviceable pack opening spring
band or proper length in the location of the original band
and insure the pull-tabs face up. Do not tack a
replacement pack opening spring band to the pack.
(4) As applicable, reinstall the items removed
in (1) above according to original construction details
and paragraph 3-9.
3-32. Snap Fastener Assemblies.
Figure 3-34. The pack opening spring band
A snap fastener assembly is a four-piece metal
fitting used to secure flaps and tabs on parachute packs
a. Repair. Repair of a pack opening spring band
and harnesses. Two of the metal parts, the socket and
entails restitching which will be accomplished as follows:
clinch plate, or the button (cap) and socket, are installed
(1) Machine-stitching.
Restitch broken or
on opposite sides of a flap or tab. The remaining two
loose machine-stitching on a pull-tab according to
metal parts, the stud and the washer or stud and post,
original construction details and paragraph 3-9, using
as applicable, are installed in a corresponding position
size E nylon thread and a medium duty sewing machine,
on the main panel or body. The flap or tab is closed by
stitching 7-11 stitches per inch.
snapping the mating parts together. The three types of
(2) Hand-stitching. Restitch broken or loose
snap fastener assemblies used on airdrop equipment
hand-stitching on a pull-tab as follows:
are the lift-the-dot, pull-the-dot, and the durable (fig. 3-
(a) Cut and remove the original
35). Repair or replace a defective snap fastener
handstitching from the pull-tab.
assembly using the following procedures, as
appropriate.
(b) Secure the pull-tab to the spring by
hand-stitching one row of backstitching according to
original stitching details, using one turn double size 3
nylon thread. Insure each stitch encircles a
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