Chapter 10: Commercial/ Heavy Vehicle Stabilization Operations Flashcards
Many commercial vehicles equip each axle with ____; rescuers can use these locations for stabilization. In addition, some commercial vehicles have specially designed ____ that can also be used as contact points for cribbing or jacks.
- a piece of tubing welded on the axle near each wheel
* jack plates and engine supports
Jacks should be equipped with ____ that allow rescuers to operate them from the outside perimeter of the vehicle.
handles
Rescuers must ____ they need to stabilize before beginning stabilization operations.
- calculate the load
How can rescuers estimate the weight of the commercial/ heavy vehicles involved in the extrication?.
- 20,000 pounds for each drive axle
- Thin or slim profile tires on a steering axle = 10,000 pounds
- balloon wide profile tires on a steering axle = 25,000 pounds
The majority of trucks involved in collisions will be found ____
wheel-resting
What makes a trucks center of gravity significantly higher than that of other vehicles?
The distance between the road surface and the bottom of the chassis is significantly greater.
On cab over units, rescuers should secure the cab with ____ to prevent it from tilting forward unexpectedly during extrication operations.
- rope, webbing, or chains
On truck cabs mounted on air suspension systems rescuers should ____ as part of stabilization.
marry the cab to the chassis to minimize movement from the air suspension system
To marry the cab to the frame on a truck with an air suspension system rescuers should ____
- fill the voids on the cab with cribbing and secure the cab to the frame with a tensioning device.
To stabilize a trailer attached to the truck requiring extrication operations, rescuers should ____
- chock the wheels of the trailer, confirm the kingpin is locked, and lower the landing gear.
Kingpin
Attaching pin on a semitrailer that connects with pivots within the lower coupler of a truck tractor or converter dolly while coupling the two units together.
In tractor trailer accidents rescuers should consider ____ as an added means of vehicle stabilization.
applying the air brake system
A major portion of applying the air brake system as an added means of stabilization in a tractor trailer incident is ____. Rescuers can ____ to disconnect the air system.
- disconnecting the air system from the tractor trailer.
* disconnect the glad hand connection
After the air system has been disengaged during a tractor trailer incident, the trailer brakes will ____
lock with the spring brake mechanism when the pressure falls below 20 - 40 psi.
Rescuers should only disconnect glad hands after ____
completing initial stabilization