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Calc and Place > Urban Breaching (Chapter 14) > Flashcards

Urban Breaching (Chapter 14) Flashcards

1
Q

Breaching is the method an assault force uses to ?

A

Gain access to a hostile stronghold

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2
Q

What are the three keys to making a successful positive entry ?

A

Speed, surprise, and violence of action

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3
Q

What are the three breaching techniques ?

A

Mechanical
Ballistic
Explosive

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4
Q

How many grains of PETN does DET cord have per foot?

A

54 grains per foot

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5
Q

DET cord has an RE factor of ?

A

1.66

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6
Q

Blasting Caps are equivalent to how many grains of TNT?

A

30.4 Grains of PETN

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7
Q

Blasting caps have how many grains of PETN? What is its RE factor ?

A

19 grains

1.60

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8
Q

What is the formula for Safe Blast Distances?

A

SBD = K factor x Cubed Rooted N.E.W.
*round to next foot *
K = 18 is constant for 4 PSI

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9
Q

what is the K factor?

A

K factor is constant, 18 for 4 PSI

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10
Q

Operations will be planned for what PSI ?

A

4.0 PSI

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11
Q

What are some examples of a mechanical breach?

A

Sledge hammer , bolt cutters, halligan, brocco torch, quickie saw

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12
Q

What is an example of a ballistic breach?

A

Shotgun

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13
Q

What are some examples of an explosive breach?

A

Charges fabricated out of Det cord and/or sheet explosive

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14
Q

What are the explosive effects?

A

Blast Pressure
Fragmentation
Thermal Effect
Chemical Poisoning

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15
Q

What are the two aspects of blast pressure?

A

Positive phase (shock front coming out) and negative phase (vacuum at point of detonation)

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16
Q

What are the four types of blast pressure?

A

Dynamic
Incidental
Reflective
Residual

17
Q

What is dynamic blast pressure?

A

Impact of the shock front

18
Q

What is incidental blast pressure?

A

Pressure 90 degrees to the blast front, i.e. behind cover

19
Q

What is reflective blast pressure?

A

Pressure will reflect back at twice the strength at 90 degree angles, corners can quadruple pressure

20
Q

What is residual blast pressure?

A

Overpressure built up in a confined place

21
Q

What is the most important hazard mitigation factor?

A

Breacher fall back point

22
Q

Types of urban breaching charges

A 
18" strip
Flex linear
Rigid linear
Water impulse
Rubber strip
Silhouette
Uli knot sliding
23
Q

How is the amount of explosives in det cord measured?

A

Grains

24
Q

How is the amount of explosives in sheet explosives measured?

A

Grams

25
Q

Grams to grains equation

A

Grains = grams x 15.4

26
Q

Grains to pounds equation

A

Grains / 7000 = pounds

Calc and Place (20 decks)

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