Final Procedures At Kit Site

TM 9-1375-213-12-1

trical impulse, there may be a difference of a few

(4) Kits have not been missed in rocket motor

milliseconds in shaped charge initiation. As a re-

interconnection or in demolition circuit intercon-

sult of this time difference, the blast from the

nection.

shaped charge on one kit could topple another kit

(5) All connections are secure.

before its shaped charge fires if it is closer than

e. Final Procedures At Kit Site.

25 feet (7.5 meters) to its neighboring kit. Refer

(1) Connect firing circuit to field firing lead as

to figure 2-17 for interconnection of rocket mo-

follows:

tors.

WARNING

(1) A multi-kit hookup of widely spaced kits

Before connecting firing circuit to field

differs from a multi-kit hookup of closely spaced

firing lead, have operator in charge as-

kits as follows:

sure that all other personnel are at least

(a) In order to interconnect the electrical

500 feet (150 meters) from nearest kit and

firing circuits for the rocket motors, the firing ca-

under cover (or at least 4000 feet (1200

bles of all kits (except nearest kit) must be ex-

meters) away if no overhead cover is

tended by using additional wire. See c below.

available).

(b) there is no interconnection of demolition

circuits, since each circuit remains independent

(a) Pull protective sheath from end of firing

and is connected to its respective kit only.

lead (A, fig. 2-10).

(2) Instructions in paragraphs 2-3b, 2-4 and

(b) Untwist and separate both bared con-

2-5 above apply to this multi-kit hookup.

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

are clean and uncorroded. If corrosion is present,

NOTE

it may be easier to strip insulation from conduc-

The normal order of assembly of demoli-

tors below bared portions than to scrape corrosion

tion circuits has again been varied here

off bared conductors. Each wire must have at

(as with closely spaced kits) to ease the

least two inches of bared conductor.

assembly process.

each conductor of the field firing lead. Make sure

b. Installing Demolition Circuits. Beginning

splices are secure.

with nearest kit, install each demolition circuit in

(d) Insulate each splice with tape to prevent

accordance with the procedures in paragraphs

shorting.

2-6a through 2-6h above.

(2) Remove yellow-tagged safety plug (fig. 1-5)

Interconnection of Rocket Motors.

from each rocket motor after all units are inter-

connected and attached to the shorted firing line.

NOTE

Retain the plugs.

Operator will determine firing circuit

(3) Count yellow-tagged safety plugs to assure

path to be used, and make a sketch of the

that number of removed plugs agrees with num-

path prior to undertaking steps below.

ber of kits to be fired.

(4) Count continuity plugs to assure that

NOTE

number of removed plugs is one fewer than num-

The suggested method of rocket motor

ber of kits to be fired.

interconnection is to have operator begin

(5) Retain all plugs until after firing.

with farthest kit and work toward near-

(6) Take plugs and blasting machine to the

est kit. (The designations of "farthest kit"

firing location.

and "nearest kit," as used here, refer to

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

the position of the kits in relation to the

end of the field firing lead.)

2-8. Multi-Kit Hookup of Widely Spaced Kits

(1) Extend rocket motor firing cable of far-

thest kit as follows:

(2 to 15 Kits)

(a) Cut firing cable in half.

(fig. 2-17)

(b) Strip three inches (7.5 cm) of insulation

a. Airfield Pocking. In operations like airfield

from the two conductors (wires) at each cut end

pocking, up to 15 kits may be fired at once by the

of cable.

interkit firing circuit if there is at least 25 feet

(7.5 meters) between kits. This distance is neces-

NOTE

sary to prevent the blast of one kit from interfer-

Use 500-foot (150 meter) reels (using cable

ing with the operation of others. Even though the

reel and reeling machine) of electrical

rockets of all kits are initiated by the same elec-

power cable or type WD-1/TT telephone

Change 2

2-20