Chapter 18 Flashcards
When parked with the aerial device in its stowed position, the apparatus has a center of gravity located?
Somehwere along the longitudinal midline of the chassis, between the front and rear axles
PTO switch varies from manufacturer to manufacturer and may be?
Pneumatic, electric,hydraulic, or a combination of these three.
Pneumatic systems require what air pressure for the PTO to be activated?
50-140 psi for the PTO to activate
What is a “hot shift” PTO system?
A PTO system that is acceptable to engage these systems when the main transmission is in neutral
Why should you whenever possible position the aerial before activating the fire pump?
When the fire pump is activated and in use, and the hydraulic system needs to be activated later, it is necessary to lower the engine speed to near idle prior to engaging the hydraulic system PTO or other device
The wheel chocks should be placed?
In front of and behind the tire, on both sides of the apparatus, with approximately an inch of extra space for the apparatus to move without causing a wheel chock to become stuck under a tire
When should cribbing be used for stabilization of apparatus?
Cribbing should be used only as a last resort by those with proper instruction and training in its use
What is the most common stabilizer type used on newer apparatus?
Box stabilizers
What size are stabilizers normally?
24x24
One stabilizer should never be fully activate alone because ?
Due to the potential for chassis and torque box damage
When the stabilizers have made contact with the ground, the driver/operator should?
Alternate between the sides to raise the vehicle to its working position, as close to level as possible
What can happen if you repetitively fully deploy one side and then the other in a two step process?
It can cause cumulative damage to tires/wheels, axles, suspension, torque box and chassis
What is good for driver/operators to know about fulcrum stabilizers?
The driver/operator can only deploy fulcrum-type stabilizers in the fully extended position and not at all if obstructions are present
When should stabilizers be placed with fulcrum stabilizers?
Fulcrum Stabilizers should be lowered to within a few inches of the ground prior to the placement of the stabilizer pads
What is short jacking and what does it do to load and range of motion?
Setting the stabilizers on one side of the apparatus shorter than the stabilizers on the other side; usually done when access for full stabilization is restricted. The load and range of safe movement capabilities significantly decrease if the extension arms are not extended to their maximum positions
Which is easier to correct, a truck laterally (side to side) or longitudinally (end to end)?
The easiest to correct is lateral unevenness
Correction of lateral unevenness is possible on grades up to?
5 percent (approximately 3 degrees)
Most manufacturers recommend lowering which stabilizers first?
On the uphill side of the vehicle first, These stabilizers should be lowered only until solid contact is made with the ground
After the apparatus is stabilized, it is preferable to operate the aerial device on which side?
Over the uphill side of the apparatus
If operating on a longitudinal grade,and the turntable is not level operating off the side of the apparatus will cause what force?
This lack of parallel operation will generate lateral and torsional stresses within the structure of the aerial device when it is raised and cause firefighters to be unsteady while working on it
Place the apparatus crosswise on the grade in what situations?
Unless the situation is unavoidable, don’t place the apparatus crosswise on the grade
Should driver operators place stabilizers on curbs, sidewalks, parking lots, water valve covers, or other similar obstructions.?
Whenever possible the driver operator should avoid doing so. These surfaces may not support the weight of the stabilizers and may collapse
What should the driver operator monitor when the apparatus is positioned on ice or slippery surfaces?
The driver operator should constantly monitor the stabilizers and be prepared to lower them further for maximum contact with the ground
What can driver/operators do to prevent the aerial device from moving or chattering along the surface due to the vibration and gravity?
Operators can prevent this through the use of wheel chocks. Sand or other friction enhancing products can be carried aboard the aerial to assist in a secure planting of the stabilizer
