Chapter 18 - Stabilizing the Apparatus Flashcards Preview

Pumping & Aerial Apparatus Driver/Operator Handbook 3rd > Chapter 18 - Stabilizing the Apparatus > Flashcards

Flashcards in Chapter 18 - Stabilizing the Apparatus Deck (70):

Even if the device is only raised a few feet from the cradle to open a tilt cab, place the ___________ in position to minimize or eliminate stress on the ____________.

stabilizers / suspension

p 642


By deploying the apparatus stabilizers, the base of stability for the aerial apparatus is effectively ___________.


p 642


Rotating the device 360 degrees will trace a ________ ________.

Gravity circle

p 642


As long as this ________ ________ does not extend outside the base of stability, the apparatus should remain stable.

Gravity circle

p 642


- Theoretical safety zone that surrounds the center of gravity on an aerial apparatus.

Gravity Circle

p 642


Newer apparatus may be equipped with ________ switches that prevent the movement of the aerial device to the short jacked side.

limit (rotational interlocks)

p 643


If the apparatus is parked on a ________ grade, the center of gravity (and theoretical gravity circle) will be shifted to the _______ side.

lateral grade / lower

p 643


Lateral grades

If the aerial device is raised over the lower side, the Gravity circle may extend beyond the base of ____________.


p 643


______________ the aerial device can also have an adverse effect on the stability of the apparatus, even on a level surface with stabilizers fully deployed.


p 643


Excessive _________ on the aerial device will result in an expansion of the gravity circle.


p 644


Some of the more common stabilizers are:
* _______-______ stabilizers (also called downriggers) - Straight jacks that extend down from the chassis.
* ______ ______________ (also called H stabilizers) - Stabilizers that extend straight away from the truck and have jacks that extend straight down to the ground.
* ___-______, scissor, or ____-style stabilizers (also called fulcrum-type stabilizers) - Stabilizers that extend down and away from the chassis at an angle.

* Post-type
* Box stabilizers
* A-frame, scissor, or X-style

p 644


To deploy the stabilizers and the aerial device, it will be necessary to engage the aerial ___________ system. In order to accomplish this, the D/O will have to activate the ________ ______-______ or other specialized hydraulic system.

hydraulic system / power take-off

p 644


The ______ system provides the power to the hydraulic pump, which in turn creates a pressure on the ________ in the hydraulic system.

PTO / fluid

p 645


The D/O should not engage the PTO until the aerial apparatus has been properly _____________ in accordance with the conditions on the scene.


p 645


The engagement switch for the PTO or hydraulic system is usually located on the ____________ of the vehicle, between the __________ and __________/________ seats or in the ________ panel above the driver's seat.

Dashboard / driver and passengers/officers / switch panel

p 645


The type of PTO activation switch varies from manufacturer to manufacturer and be __________, __________, __________, or a combination of these three.

pneumatic, electric, hydraulic

p 645


Pneumatic PTO systems require anywhere from _____ to _____ psi air pressure for the PTO to be operated depending on the manufacturer.

50 to 140

p 645-646


Most new models of aerial apparatus are equipped with what is called a "_____-______" PTO system. It is acceptable to engage these systems when the main transmission is in ___________.

"hot-shift" / neutral

p 646


Attempting to engage a PTO from neutral in a vehicle not equipped with a hot shift system could result in serious damage to the ______ and ______ _____________.

PTO / main transmission

p 646


Whenever possible, position the aerial device before activating the _______.


p 646


When the fire pump is already activated and in use, and the hydraulic systems needs to be activated later, it is necessary to lower ________ speed to near idle prior to engaging the hydraulic system PTO or other device. This action will lower _______ supply to nozzles. The operator must notify personnel on __________ and other nozzles of what is taking place.

engine / water / handlines

p 646


The process of setting up the stabilizers should begin with both the driver and officer assessing the _______ area.

setup area

p 646


The goal of stabilizer deployment is to ensure one move and one setup without having to ____________.


p 651


Conducting preliminary checks:

* If not automatically accomplished, activate the ______ ______ lock to minimize longitudinal movement of the chassis.
* Make sure the PTO engagement _______ is ____ before leaving the cab.
* ________ the wheels.

* front brake
* light is lit
* chock

p 651


The wheels should have chocks placed both ___ _______ ___ and ________ the tire, on both sides of the apparatus, with approximately an _____ of extra space for the apparatus to move without causing a wheel chock to become stuck under a tire.

in front of / behind / inch

p 651


After any lifting of the apparatus has been preformed, the chocks should be _____________ to ensure that this space is still maintained before lowering the apparatus. If this space is not maintained, it will be necessary to _______ the apparatus to remove the chock blocks.

repositioned / relift

p 651


If there is any doubt as to whether or not there is room for the stabilizers to deploy, a short ______ ______, _______ hook, or ______ span can be used to estimate the travel path of the stabilizers.

like pole / closet hook / arm span

p 652


Whenever possible a ________ should assist the D/O with positioning the apparatus because a ________ can help avoid curbs, manholes, vehicles, and so forth.

spotter / spotter

p 652


When the stabilizers are in place, the D/O should check the __________ upon which they are resting to be certain the ground is _________ enough to continue operations.

surface / stable

p 652


- Flat metal plate attached to the bottom of the aerial apparatus stabilizer to provide firm footing on the stabilizing surface.

Stabilizer shoe

also known as stabilizer boot or stabilizer foot

p 652


Follow departmental SOPs or manufacturers recommendations in situations when __________ is used to supplement stabilizer effectiveness. __________ should only be used as a last resort by those with proper instruction and training in its use.

cribbing / cribbing

p 652


Avoid placing stabilizers over ________ areas, ___________ tanks or vaults, and _________ access zones.

drainage / underground / utility

p 653


Once the D/O is assured that the ____________ activities are successfully completed and the ground is prepared for stabilization activities, the ___________ valve may be operated to provide hydraulic power to the stabilizing system.

preliminary / selector

p 653


Even _________ allows for the maximum stability of the apparatus and for the greatest range of safe movement of the aerial device.


p 654


General principles of stabilizer controls:
* Many of these controls are ______-type valves that move up to about ____ degrees.
* Operating these controls will automatically regulate _______ _____ speed. A fast-idle toggle switch or manual throttle control may also regulate _______ _____ speed. This provides the power necessary to perform the desired action.
* When the D/O operates the control, an increase in _______ _______ (noticeable due to the increase in the sound level) occurs.
* Operation of these valves also affects the vehicles engine speed. Avoid ________ or _______ operation of the valves.

* lever / 90
*engine idle / engine idle
* engine speed
* rough or jerky

p 654


_____ ____________ are the most common stabilizers used on newer apparatus.

Box stabilizers

p 654


- Two piece aerial apparatus stabilizing device consisting of an extension arm that extends directly out from the vehicle, and a lifting jack that extends from the end of the extension arm to the ground.

Box Stabilizer

also known as H-jack or H-stabilizers

p 654


When the extension arms have been extended to their final positions, the portable ___________ ______ should be centered beneath the stabilizer shoes so that they will be in position when the jacks are lowered. The __________ ______ are usually provided by the manufacturer of the apparatus and are usually ____x____ inch with a built in handle.

stabilizer pads / stabilizer pads / 24x24 inch

p 655


Due to the potential for chassis and torque box damage, one ____________ should never be fully activated alone. Always activate in a multi-step, ______ to ______ or ______ to ______ process.

stabilizer / side to side / front to back

p 656


In a four-jack system operate the stabilizers in __________.


p 656


Stabilizing using ________-type stabilizers or those that extend straight down from the chassis is similar to the box-type stabilizer. The primary difference is that the D/O can only deploy __________-type stabilizers in the fully _________ position and not-at all if ______________ are present.

fulcrum / fulcrum / extended / obstructions

p 657


- Stabilizing device that extends at an angle down and away from the chassis of an aerial fire apparatus.

Fulcrum-type stabilizer

also know as A-frame, scissor, or X-style stabilizer

p 657


The method of deploying fulcrum-type stabilizers is the same as described for box-type, with one exception. Fulcrum stabilizers should be lowered to within a few _______ of the ground prior to the placement of the ____________ ______.

inches / stabilizer pads

p 657


The design for some apparatus allow for partial extension of the stabilizer arms, sometimes called "_______-_________".


p 658


- 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.


p 658


When operating in restricted areas, fully extend the extension arms on the side that the aerial device is ?

going to be over

p 658


There are two ways that the truck can be uneven: ________ or ____________. Of the two the easiest to correct is ________ unevenness.

laterally (side to side) or longitudinally (end to end) / lateral

p 658


Correction of lateral unevenness is possible on grades of up to ___ degrees, although this can vary depending on the aerial device.

5 degrees

p 658


A slope of 5 degrees means that there is a rise in terrain height of ____ feet for every run of _____ feet of distance.

5 / 100

p 658


Lateral unevenness:

Most manufactures of aerial devices recommend lowering the stabilizers on the _________ side of the vehicle first making solid contact with the ground. Lower the __________ side stabilizers until they raise the __________ side of the truck level with the ________ side.

uphill / downhill / downhill / uphill

p 658


The D/O must make sure to raise the truck enough to activate the ____________, if the apparatus is so equipped. If the ___________ have not activated, it will be necessary to raise both sides of the truck until they do.

interlocks / interlocks

p 658-659


Lateral unevenness:

After the apparatus is stabilized, it is preferable to operate the aerial device over the ________ side of the apparatus.

uphill side

p 659


When operating on a longitudinal grade, the aerial turntable will not be parallel to the ground if the device is operated over the ?

side of the apparatus

p 660


On longitudinal grades, operate the aerial device directly over the ______ or ______ of the apparatus to minimize stress on the device.

front or rear

p 660


On longitudinal grades, operate articulating aerial devices off the _______ of the vehicle if possible.


p 660


Most aerial apparatus have restricted loads when operating on grades, some as much as ______-______ the normal load, and if in the ______ zone do not operate the aerial device.

one-half / red zone (unsafe load)

p 660


Rather than deploying the stabilizers on an unsafe or potentially unsafe surface, ____________ the apparatus.


p 661


One effect of ice melting is the creation of an _____ ______ between the stabilizer pad and the ground, compromising the stability of the apparatus.

air gap

p 661


When the ground is frozen solid and the surface is on an angle, the aerial device can move or _________ along the surface due to the combination of vibration and gravity; operators can prevent this through the use of wheel ________.

chatter / chocks

p 661


On most aerial apparatus, the combination of the __________ feature of the selector valve and the hydraulic system _________ valve provide automatic locking capabilities.

interlock / holding

p 662


The ___________ prevents the flow of hydraulic fluid into or out of the stabilization system while the aerial device is in use.


p 662


The __________ valves prevent the movement of fluid within the stabilization system. The D/O activates the __________ valves by moving the selector switch to the aerial position.

holding / holding

p 662


Box stabilizers commonly have holes designed for the insertion of ?

steel safety pins

p 662


When the use of the aerial device is complete and it is returned to the bed, the stabilization process is __________ in order to prepare the apparatus for departure from the scene.


p 663


The D/O should always raise the stabilizers following the _________ order by which they were deployed whether on level or uneven terrain. Following the ________ order avoids undue stress on any component of the aerial apparatus.

reverse / reverse

p 663


Older midship and tractor-drawn aerials are the most likely to have __________ stabilizers.


p 664


Angles less than ____ degrees provide less stability, as do angles increasing from ____ to ____.

60 / 60 to 90

p 665


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

90 / stability

p 665


The best way to place the vehicle into this angled position is the following:
* Approach the objective building until the ____________ is right next to it.
* Turn the wheels of the _________ sharply toward the left or right of the parking area (_______ from the building) and pull the truck slightly forward.
* Turn the _________ wheels sharply toward the building and back the truck slightly towards the building. This pushes the ________________ toward the desired object, and produces the desired _________ between the tractor and the trailer.
* Set all _______ once in position, including the one for the trailer axle, and as described earlier further stabilization may be employed.

* turntable
* tractor / away
* tiller / turntable / angle
* brakes

p 665


True or False:

The techniques for jackknifing tillered aerial apparatus are more important on older models of apparatus than on modern tillered aerial apparatus ?


modern tillered aerial apparatus are usually equipped with stabilization systems that are perfectly capable of securely stabilizing the apparatus

p 665