Chapter 7: Passenger Vehicle Stabilization Operations Flashcards Preview

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Flashcards in Chapter 7: Passenger Vehicle Stabilization Operations Deck (98)
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Vehicle Stabilization

Providing additional support to key places between a vehicle and the ground or other solid anchor points to prevent unwanted movement.


Good stabilization ____ to prevent ____.

* the area of contact between the vehicle and the ground
* any sudden or unexpected movement of the vehicle.


The initial phase of stabilization

Includes using wedges, wheel chocks, and step chocks.


The secondary phase of stabilization

Includes using struts, chains, straps, and cribbing.


The ongoing phase of stabilization

Includes the reassessment of current stabilization and the application of new stabilization as necessary.


Center of gravity

Point through which all the weight of a vessel and its contents may be considered as concentrated, so that if supported at this point, the vessel would remain in equilibrium in any position.


When most passenger vehicles are empty, the center of gravity is ____

slightly forward of the front door in the center of the vehicle.


Longitudinal axis

(horizontal) Imaginary horizontal line that extends lengthwise from the front to the rear of the vehicle and passes through the center of the passenger compartment.


Vertical axis

Imaginary vertical line that extends from the top of the vehicle to the bottom of the vehicle, stops at the ground, and passes through the center of the passenger compartment.


Lateral axis

Imaginary horizontal line that extends from the outside of the passenger side of the vehicle to the outside of the driver side of the vehicle, and passes through the imaginary center point of the passenger compartment.


What directions will an unstable vehicle move?

* Horizontal - forward or rearward on the longitudinal axis or horizontally along the lateral axis
* Vertical - up or down in relation to the ground while moving along the vertical axis
* Roll - side to side while rotating along the longitudinal axis but remaining horizontal in orientation
* Pitch - up or down on the lateral axis causing the front or rear of the vehicle to rise or fall
* Yaw - twist or turn on the vertical axis and causes the front and rear portions to move in a left or right direction in relation to their original position.


In most cases, responders should attempt to obtain ____ or ____ point stabilization, however, some situations may require more points of contact to effectively achieve the desired level of stabilization.

four or six


Rescuers must make an effort to ensure that any stabilization point does not ____

impede or block potential victim access, egress, or extrication operations.


Most wheel resting vehicles can be stabilized by ____

using cribbing or step chocks strategically located at the strongest or most structurally sound points of the vehicle.


The strongest, most structurally sound points on passenger vehicles are ____

the frame components where the pillars or posts meet the frame.


Rescuers should strive to use ____ components of the vehicle as stabilization points.



If necessary rescuers may use undamaged dynamic components for stabilization, such as ____

the suspension system.


Rescuers should not use other vehicle components for stabilization, such as ____ and ____

* exhaust system
* drivetrain


Prior to lifting an object off of the vehicle, rescuers should ____

capture the suspension


Never rely on the vehicles ____ as the only means of stabilization. Use them only in conjunction with other methods.

mechanical systems


When using pneumatic lifting bags or cushions to lift a vehicle, rescuers should ____

use solid pieces of plywood or heavy duty mat material at least as large as the bags to protect the bags from damage.


Safety procedures for using pneumatic lifting devices:

* Control hazards
* Determine victim location and provide care
* Crib the vehicle and insert the bag under the vehicle in a way that allows maximum surface contact.
* Maintain vehicle stabilization
* Protect the bag from punctures
* Lift an inch, crib an inch


Do not place pneumatic lifting devices near vehicle ____

exhaust system's catalytic converter


When using high pressure lifting bags during extrication operations perform the following actions:

* Assess the load to be lifted
* Calculate the load to be lifted
* Use the proper lifting bag for the load to be lifted
* Insert the bag under the object to provide a straight upward lift
* Ensure appropriate load capture throughout the lifting operation.
* Inflate the bag
* Adjust the lifting platform higher
* Repeat the above steps until meeting desired lift.


Low and Medium pressure lifting cushions should only lift the object ____

enough to remove the victim.


When using Low and Medium pressure lifting bags, rescuers must ____ to avoid crushing the victim.

crib the pivot side (opposite side of the lift) of the object,


Follow these guidelines when using jacks during extrication:

* Crib the vehicle specifically for the type of jack and/ or lift
* Establish a firm base to set the tool against so that the tool will not push into the ground when lifting. Use cribbing or a platform to provide a good base.
* Capture the load throughout the lifting operation
* Move only the material the amount needed to extricate the victim.



Device consisting of a bar pivoting on a fixed point, using power or force applied at a second point to lift or sustain an object at a third point.



Support or point of support on which a lever turns in raising or moving a load.


To calculate the potential mechanical advantage of a lever, measure the distance between:

1. The load and the fulcrum (load side)
2. The fulcrum and the point of applied force (force side)
If the length of the lever is three times as long on the force side of the fulcrum as on the load side, the lever has a 3 to 1 mechanical advantage. A load weighting 300 pounds will require 100 pounds of force to lift.