Pump Ops Chpt 18 Flashcards
(27 cards)
When parked, the aerial device in its stowed position, the apparatus has a center of gravity located along the __________ of the chassis, between the front and rear axles.
Longitudal midline
Rotating a device will trace a ______
Gravity circle
Newer apparatus may be equipped with _______ that prevent the movement of the aerial device to the short jacked side
Limit switches (rotational interlocks)
Excessive loading on the aerial device will result in an expansion of the ______
Gravity circle
(Also called outriggers, ground jacks, and screw jacks) Are required to prevent the apparatus from tipping as the aerial device is extended away from the centerline of the chassis
Stabilizers
Straight jacks that extend down from the chassis (also called down riggers)
Post type stabilizers
(Also called H stabilizers) Stabilizers that extend straight away from the truck and have jacks that extend straight down to the ground
Box stabilizers
(Also called fulcrum stabilizers) stabilizers that extend down and away from the chassis at an angle
A frame, scissor, or x style
Pneumatic systems require anywhere from _____ air pressure for the PTO to be operated, depending on the manufacturer.
50 to 140 psi
Once the driver/operator is assured that the preliminary activities are successfully completed and the ground is prepared for stabilization activities, the ______ may be operated to provide hydraulic power to the stabilizing system
Selector valve
The driver operator should make certain the control is in the ______, which is also called the outrigger, jack, or leveling position
Stabilization position
Allows for the maximum stability of the apparatus and for the greatest range of safe movement of the aerial device
Even terrain
Are the most common stabilizers used on newer apparatus
Box stabilizers
The stabilizer pads are usually provided by the manufacturer of the apparatus and are usually ______ with a built in handle
24x24 inch
The primary difference is that driver/operators can only deploy ______ in the fully extended position and not at all if obstructions are present
Fulcrum type stabilizers
The designs of some apparatus allow for partial extension of the stabilizer arms, sometimes called ______
Short jacking
There are two ways that the truck can be uneven: laterally (side to side) or longitudinally (end to end). Of the two the easiest to correct is ________
Lateral unevenness
Correction if lateral unevenness is possible on grades of up to _____ although this can vary depending on the aerial device
5 degrees (8.7 percent)
A slope of 5 degrees means that there is a rise in terrain height of ___ for every 100 ft of distance
5 feet
On most aerial apparatus, the combination of the interlock feature of the selector valve and the hydraulic system holding valves provide _______
Automatic locking capabilities
The _____ prevents the flow of hydraulic fluid into or out of the stabilization system while the aerial device is in use
Interlock
The _____ prevent the movement of fluid within the stabilization system
Holding valves
The driver operator activates the holding valves by moving the selector switch to the _______
Aerial position
Parking the apparatus with an ______ between the tractor and trailer sections increases the stability beyond what the stabilizers alone can provide
Angle
