4.0

Question 1

The base explosive HMX is found in what explosive most commonly used in breaching?

Answer 1

Shocktube detonators.

Question 2

Which types of explosives will be most commonly utilized for main charges during tactical breaching operations by law enforcement.

Answer 2

Det Cord
ECT
FLSC
Explosive Sheet

Question 3

What is the flexible linear charge designed to produce?

Answer 3

A linear cutting action in various applications where remote, fast, reliable, cutting of materials is required.

Question 4

What is the purpose of sealing ends of det cord after cutting?

Answer 4

To seal the explosives / keep moisture out.

Question 5

How should lead sheathed flexible linear shaped charge be cut?

Answer 5

With a fixed or locking blade knife on a non-sparking surface.

Question 6

What are some of the safety considerations in the use of a lead sheathed linear shaped charge, and what can be done to minimize these hazard to the entry team?

Answer 6

1. Fragmentation, toxic gases, lead vapors.

2. Breathing apparatus and ballistic shields.

Question 7

Under what conditions will wet det cord propagate?

Answer 7

At least 6” of det cord that is dry at initiation point.

Question 8

What is the most common cause of “cut offs” when initiating a charge using det cord?

Answer 8

1. Sharp bends

2. Overlapping 90 degree turns.

Question 9

List 5 characteristics of flexible explosives (Ex. Explosive sheet)

Answer 9

1. Flexible
2. Waterproof
3. Insensitive
4. Easy to cut
5. Easy to apply

Question 10

What is the most hazardous activity associated with explosive charges?

Answer 10

handling misfires.

Question 11

What is the intended use of sheet explosive and the work effects that are achieved in explosive breaching applications?

Answer 11

Used in general demolition as a cutting or breaching charge.

Question 12

What are two base explosives used in producing explosive sheet?

Answer 12

PETN and RDX

Question 13

What is the intended use of det cord?

Answer 13

A detonating agent, a priming agent, or alone as an explosive charge.

Question 14

What is the primary means to insure proper detonation of a breaching charge using det cord?

Answer 14

Dual primed

Question 15

Describe the features and characteristics of shock tube detonators.

Answer 15

It has a non electric detonator crimped to a hollow polyethlene-surlyn plastic tube filled with HMX with opposite end sealed with factory crimp. The detonator has an ignition charge, intermediate charge, and main charge (HMX).

Question 16

The terms “detonator” and “blasting cap”, when used in explosive breaching, refer to the same thing (T or F)

Answer 16

True

Question 17

Why should spray adhesives or electrical tape be avoided when constructing charges with explosive sheet?

Answer 17

They react with the plastisers causing a low order detonation.

Question 18

Which of the following items are NOT considered to be mission essential to conduct explosive breaching operations.

A)Reliable dual shock tube initiator

B)Commercial wall entry frames

C) Hearing / Eye Protection

D) Gas mask / respiratory protection

E) All of the above.

Answer 18

B) Commercial wall entry frames

Question 19

What is the type and quantity of explosive material used in shock tube?

Answer 19

0.1 gr/ft HMX with aluminum powder.

Question 20

When initiated, what is the speed of propagation in the shock tube?

Answer 20

6,500 FPS

Question 21

The shock tube is constructed of non-fragmenting, co-extruded polyethylene-surlyn plastic (T or F)

Answer 21

True

Question 22

One advantage of a non-electric shock tube detonator is its resistance to impact (T or F)

Answer 22

False

Question 23

name a disadvantage of utilizing a slant charge over a hinge charge when attacking a wood door.

Answer 23

Portion of door remains intact. Attacking against the wood grain of the door.

Question 24

What conditions permit the cutting of explosives with scissors or shear-type cutters?

Answer 24

NEVER

Question 25

When constructing breaching charges, what problems can be associated with operator error?

Answer 25

1. Low order detonations. 2. Charge failure 3. Misfires.

Question 26

In preparing the initiator assembly, what is the purpose served by the duct tape sheath?

Answer 26

To remove the "memory" from the shocktube. Hides the flash/prevents tangle.

Question 27

Fire hazard concerns are significantly reduced utilizing a fluid impulse charge (T or F)

Answer 27

true

Question 28

Describe the proper placement of the door lock strip charge.

Answer 28

Placed on the lock side of the door, priming end down, centered over locking mechanisms and B/T door knob and frame.

Question 29

Explain versatility of the door hing charge.

Answer 29

The charge can be constructed with 3 or more charge assemblies and placed at will around selected points of a door, gate or window.

Question 30

What are two acceptable methods of connecting the detonating cord of the firing assembly to the main charge?

Answer 30

A square knot Plastic det cord connector.

Question 31

Describe the major factors that could prevent success with a fracture charge.

Answer 31

Inaccurate information of the wall's construction that could lead to construction of a charge of inadequate strength and not having knowledge of the objectives inside or on the other side of the wall that could prevent success.

Question 32

Describe the condition the mechanical shock tube initiating device must be in before attaching the shock tube firing head/block.

Answer 32

Ensure the trigger mechanism is locked and all safety features are engaged.

Question 33

What is the waiting period for a misfire with shocktube before inspecting the conditions down range during training?

Answer 33

30 mins

Question 34

When documenting an explosive shot, why are photos and video taken before and after?

Answer 34

This documents exactly the conditions of the intended breach point and the charge placement and the actual results. These photos and video compliment written documents.

Question 35

Which of the following statements are parts of a range safety brief? A) Explanation of the evolution's objectives. B) The sequence for priming charges. C). Documentation assignments D) Misfire procedures E) All of the above

Answer 35

E) All of the above.

Question 36

List the components of a tactical firing assembly.

Answer 36

1. Mechanical / Dual shock tube initiating device 2. Shock tube leads X2 3. Detonators X2 4. one foot of 50gr/ft det cord.

Question 37

An explosive charge consists of 12" of 50gr/ft det cord, two 20 gram boosters, and 9 feet of 125 gr/ft lead flexible linear shaped charges. A) What is the NEW? B) What is the maximum distance of the frag hazard zone? C) What is the MSD for team personnel?

Answer 37

A) 0.43 B) 246 feet C) 14 feet

Question 38

An explosive charge consists of 32 feet of 50gr/ft det cord and 16 squares of C-3 explosive sheet 3" x 3". A) What is the NEW? B) What is the MSD for team personnel?

Answer 38

A) 1.96 B) 23 feet