Multi-Kit Hookup of Closely Spaced Kits

TM 9-1375-213-12-1

a. General. Instructions in paragraphs 2-3b, 2-4

(1) Pull protective sheath from end of firing

and 2-5 apply to a multi-kit hookup. However, in

lead (A, fig. 2-10).

the hookup of closely spaced kits, the kits must be

(2) Untwist and separate the two bared con-

interconnected. First the demolition circuits are

ductors (B, fig. 2-10), and assure that conductors

interconnected by taping the detonating cords to-

are clean and uncorroded. If corrosion is present,

gether at the plastic sleeve area, thus forming an

it may be easier to strip insulation from conduc-

explosive junction of the electric blasting caps and

tors below bared portions than to scrape corrosion

detonating cord (see b below). Then the rocket

off bared conductors. Each wire must have at least

motors are interconnected by attaching the firing

two inches of bared conductor.

cable connector of one rocket motor to the interkit

connector of another. BOTH of these interconnec-

(3) Splice one conductor of the firing lead to

tions are necessary to assure simultaneous firing

each conductor of the field firing lead. Make sure

of all kits (see c below); figure 2-13 shows the gen-

splices are secure.

eral layout for these interconnections.

(4) Insulate each splice with tape to prevent

b. Interconnection of demolition circuits (form-

shorting.

ing explosive junction) (fig. 2-14).

f. Remove dust cover from M 57 and dust

(1) Cut nylon tapes of each demolition circuit

cover/shorting plug from demolition circuit

wooden subpack, if not previously done, and re-

electric lead and insert electrical connector

move the lid (fig. 1-7).

of demolition circuit into mating connector

CAUTION

on firing device M57 (A fig. 2-11).

Ensure that the combination shorting

CAUTION

plug and dust cover is assembled to

When laying out detonating cord, make

the connector of the demolition cir-

cu it . Do not remove the shorting

sure there are no kinks, sharp bends or

plug until ready to connect the

overlapping of detonating cord.

d e m o l i t i o n circuit.

g. Lay out demolition circuit electrical wire on

(2) Remove each demolition circuit from its

ground in a direction away from the kit and then

subpack and plastic packing bag. Place each plas-

lay detonating cord on ground from end of wire

tic bag over each rocket nozzle and tape securely

back to kit.

around narrow section of nozzle. This is most im-

portant if kits are to be left emplaced for a long

h. Remove the protective adhesive tape from the

period prior to firing since it provides a dust and

cap well of the shaped charge and insert the non-

moisture barrier.

electric blasting cap (crimped to end of detonating

cord) into the cap well (B, fig. 2-11). Place blasting

NOTE

cap into well and secure by threading priming

Normal demolition procedures would call

for connection of the demolition circuits

adapter M1A4 into well.

AFTER interconnection of the rocket mo-

i. Remove yellow-tagged safety plug (fig. 2-12)

tors and connection of the circuit to the

from rocket motor. Retain the safety plug until kit

field firing lead. This standard order of

is fired.

assembly is being varied in this procedure

to ease the assembly.

NOTE

Personnel that regularly use the kits

CAUTION

should keep one or two safety plugs on

When laying out- detonating cord, make

hand to replace a damaged or missing

sure there are no kinks, sharp bends, or

plug.

overlapping of individual cords.

j. Take plug and blasting machine to the firing

(3) Lay out demolition circuit elecctrical wire

on ground in a direction toward the center of the

location.

assembled kits and then lay detonating cord on

k. Proceed to final preparations (para 2-9).

ground from end of wire back to its kit.

(4) Remove the protective adhesive tape from

each shaped charge cap well and insert each non-

2-7. Multi-Kit Hookup of Closely Spaced Kits

electric blasting cap (crimped to end of detonating

(Two, Three or Five Kits)

cord) in the well of its kit's shaped charge (B, fig.

2-11). Secure the caps in the wells by threading

NOTE

each priming adapter, M1A4 into its well.

No instructions are given for closely spaced

(5) Place all plastic covered detonating cord/

cap junctions together so that they are all aligned

multi-kit hookups using four kits since

there would be little difference in the cra-

tering effect between 3 or 4 kit hookups.

A hookup of more than five kits is not

considered practical.

2-12

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