Front impact collisions can compound the problems found on the extrication scene. When two vehicles collide while traveling in opposite directions, the impact force can be increased exponentially. For example, consider two vehicles traveling in opposite directions down a stretch of highway. If the vehicles were to collide head-on into each other while traveling at 50 miles an hour, the kinetic energy absorbed throughout the passenger compartment can be the equivalent of hitting a stationary object at 100 miles an hour, making patient injuries much more severe, and possibly displacing the front of the vehicle completely downward onto the roadway. Additionally, when the vehicles come to rest, the front of the passenger compartment may be pushed down upon the occupants, hindering access. Furthermore, when the vehicle is up against a stationary object, it will be very difficult to displace the dashboard and firewall assembly back off the occupants. In this case, the High-Dash Displacement is successful for disentanglement, as it will allow for displacement without driving the front of the vehicle downward, or into the object the vehicle is resting against.
To execute this maneuver, the doors on the patient’s side of the vehicle have already been removed, and the roof assembly has been either rolled back or removed completely. Rescuers make two parallel cuts into the “A” post; one directly above the lower hinge, and one directly below the lower hinge (see Photo 7). Two more cuts are crucial in performing this maneuver: one cut is made from the lower side of the front wheel well, just behind the center of the wheel well, and the other cut is made from the top of the fender area, just behind the shock absorber/strut tower. Note: There is a structural metal fender channel located in the vicinity of the top cut area, between the fender and the hood. It is vital that this channel is cut completely through, or the dashboard will not successfully displace.
Once these relief cuts have been made, the spreaders are used to first clamp onto the area between the two parallel cuts in the lower-hinge area, and bend the material out of the way (see Photo 8). This will allow for a large purchase point for the spreader tips to be set into place. At this time, additional cribbing/support should be put in place below the “A” post, so the bottom of the channel does not displace. The spreaders are then opened slowly, being sure to keep the handle of the tool parallel with the ground, or slightly tilted upward; this will increase the tool’s capability to lift the dashboard upward, instead of deflecting the lower region of the “A” post outward. Lifting the “A” post will result in displacing the dashboard area, while pivoting the fender assembly at the relief cut in front of the strut tower (see Photo 9).
The objective of this month’s discussion was to arm the rescuer with three more tools in their “tool cache” for use whenever they are faced with an unorthodox rescue situation on the extrication scene. There are many more maneuvers that rescuers utilize and share within the extrication world; what works for some companies may not be successful for others. It is highly advisable to take these skills and practice them on actual vehicles before the next extrication run comes in. Having the time and resources available to practice prior to the emergency will increase the effectiveness and efficiency of the company when they are deployed to the emergency.
Until next time, stay focused and stay safe.
- See Michael Daley Live! Michael P. Daley will be teaching "Firefighting Operations in Strip Malls and Taxpayers" at Firehouse World, in San Diego, on March 1, 2011.
MICHAEL P. DALEY is a lieutenant and training officer with the Monroe Township, NJ, Fire District No. 3, and is an instructor with the Middlesex County Fire Academy, where he is responsible for rescue training curriculum development. Mike has an extensive background in fire service operations and holds degrees in business management and public safety administration. Mike serves as a rescue officer with the New Jersey Urban Search and Rescue Task Force 1 and is a managing member for Fire Service Performance Concepts, a consultant group that provides assistance and support to fire departments with their training programs and course development. Mike has been guest on several Firehouse.com Podcasts including: Successful Rescue Operations in Today's Fire Service, Preparing for Tomorrow's RIT Deployment Today and Basement Fire Tactics Roundtable podcasts. View all of Michael's articles and podcasts here. You can reach Michael by e-mail at: FSEducator@aol.com.