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Figured 2-17. Multi-kit hookup, widely spaced.
Up
TM-9-1375-213-12-1 Demolition Materials Demolition Kit Cratering: M180 NSN 1375-00-148-7159 and Training: M270 (Inert) NSN
Next
Figure 2-18. Kit with firing circuit taped.
TM 9-1375-213-12-1
firing lead conductors and take whatever correc-
(e) Assure that the continuity plug is
tive action is required.
threaded onto the interkit connector in order to
WARNING
complete the circuit.
(f) Taking along cutoff portion of rocket
If necessary to work in area of kit(s), tem-
porarily reinstall each yellow-tagged
motor firing cable, lay out reeled wire to next kit
safety plug. Remove each plug when work
to be connected.
is completed.
(g) When enough extension wire has been
unreeled, cut wire and strip three inches (7.5 cm)
CAUTION
of insulation from the two conductors in the ex-
Never use any power source other than a
tension wire.
blasting machine to fire the M180 - it could
(h) Secure extension wire to cut off portion
produce a warhead misfire.
of rocket motor cable in same manner as indicated
c. If circuit checks out, actuate blasting ma-
in c (1) (d) above.
(2) Connect just-extended cable to next rocket
chine several times with nothing attached to it.
Then attach one firing lead conductor to each ter-
motor in line as follows:
minal of blasting machine.
(a) Remove and set aside firing lead plug
from the firing cable connector of the just-ex-
tended cable.
2-10. Operation
(b) Remove and retain continuity plug (fig.
Fire kit(s) by using maximum possible force to
2-15) from next kit's interkit connector.
actuate blasting machine (standard SO cap) or
(c) Thread the firing cable connector of the
keep squeezing handle until fire lamp lights
just-extended cable on to the next kit's interkit
(M341).
connector (fig. 2-16) and secure it.
(3) Working from farthest kit toward nearest
kit (excluding the nearest kit), extend all cables
2-11. Recovery of Kit(s) Prepared For Use But
and connect all rocket motors in the manner de-
Not Used
scribed in paragraphs c(1) and c(2) above. The fir-
ing circuit of the nearest kit remains intact for
CAUTION
connection to the field firing lead.
As required, clean and thoroughly dry all
d. Final Check of Hookup. Working from nearest
parts of recovered kit(s).
kit toward farthest kit, make a final check of
hookup by assuring that:
a. Disassembly of Firing Circuit(s).
(1) All electrical connections and splices are
(1) Disconnect field firing lead from blasting
secure.
machine terminals and short firing lead conduc-
(2) All splices are insulated to prevent short-
tors.
ing.
(2) At kit site, reinstall a yellow-tagged safety
(3) No kite have been missed in the rocket
plug in the safety plug connector of each kit.
motor interconnection.
(3) Unscrew priming adapter (s) and remove
(4) Continuity plug is installed in farthest kit
non-electric blasting cap(s) (fig. 2-7) from
in line.
shaped charge(s) and place a piece of tape
e. Final Procedures At Kit Site. Perform the fi-
over the cap well(s) of the shaped charge(s).
nal procedures in paragraph 2-7e above.
(4) Disconnect the field firing lead from the
firing lead of nearest or single kit. Short the con-
2-9. Final Preparations
ductors of the firing lead and wrap them with
a. At firing location unshort firing lead conduc-
tape.
tors and check circuit with a blasting galvanom-
(5) For multi-kit hookups, disconnect the fir-
eters or Blasting Cap Test Set M51. If a galvanom-
ing cable connectors from the interkit connectors
eters is being used, about 23 ohms should be read
of remaining kits. Connect the tiring lead plugs
for each 500-foot length (150 meters) of type WD-1/
to the firing cable connectors and connect the con-
TT telephone cable, about 6 ohms should be read
tinuity plugs to the interkit connectors.
for each 500 feet (160 meters) of electrical power
(6) Coil firing circuit(s) (with extension wire
cable. Because of the high resistance of the WD-1/
if used) and secure with tape. The coil should look
`IT cable, test set M51 may not indicate a good
similar to the configuration shown in B, fig. 2-18.
circuit when used to test a 4000 foot (1200 meters)
(7) Short the field firing lead conductor.
length of the cable even if the circuit is mod. If
(8) Reel the field firing wire onto the reel(s).
M51 indicates a bad circuit end the length of
b. Disassembly of Demolition Circuit(s).
the.circuit is long, recheck the circuit with a
(1) If disassembling a closely spaced hookup,
galvanometer, if available.
remove the tape from the explosive junction (fig.
b. If circuit does not check out properly, reshort
2-13).
(2) Disconnect demolition circuit electrical
Change 2
2-22

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