Chapter 18 - Stabilizing the Apparatus

Question 1

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

Answer 1

increased

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Question 2

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 ____________.

Answer 2

stabilizers / suspension

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Question 3

Rotating the device 360 degrees will trace a ________ ________.

Answer 3

Gravity circle

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Question 4

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

Answer 4

Gravity circle

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Question 5

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

Answer 5

Gravity Circle

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Question 6

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

Answer 6

limit (rotational interlocks)

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Question 7

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

Answer 7

lateral grade / lower

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Question 8

Lateral grades

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

Answer 8

stability

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Question 9

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

Answer 9

Overloading

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Question 10

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

Answer 10

loading

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Question 11

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.

Answer 11

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

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Question 12

__________ stabilizers are similar to box-type hydraulic stabilizers. They consist of an extension ______ that has a _______ _______ attached to the end of the arm.

Answer 12

Manual / arm / screw jack

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Question 13

Using manual stabilizers:

The primary difference is that the driver/operator must swing the ___________ _______ into position manually; in addition he or she must manually turn the _______ _______ attached to the arm to lower the stabilizer.

Answer 13

extension arm / screw jack

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Question 14

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

Answer 14

60 / outside

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