Pump Ops Chpt 18 Flashcards Preview

Chapa 1 pump ops > Pump Ops Chpt 18 > Flashcards

Flashcards in Pump Ops Chpt 18 Deck (27):

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



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



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



Maximum stability is achieved when the angle of the tractor is _____ from the centerline of the trailer, and the aerial ladder is operated toward the outside of the angle.

60 degrees


The driver/ operator should never position the vehicle with the tractor and trailer at an angle greater than _____ degrees as poor stability is produced and damage to the truck may occur.

90 degrees


Many tractor drawn vehicles are equipped with an alarm that sounds if an attempt is made to create an angle greater than _______

90 degrees