Flashcards in Chapter 7, Stabilizing The Apparatus Deck (17)
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1
What is the most critical aspect of preparing an aerial apparatus for use?
The apparatus stabilization process.
2
When parked, with the aerial device stowed, where is the apparatus center of gravity?
Along the longitudinal midline, between the front and rear axles.
3
What is the gravity circle of an aerial apparatus?
The "safety zone" that surrounds the center of gravity on an aerial apparatus.
4
How can the aerial apparatus tip over, with the aerial device deployed?
If the gravity circle extends beyond the base of stability, the apparatus can tip over.
5
Where will the center of gravity move, if the aerial apparatus is parked on a lateral grade (slope)?
The center of gravity (and the gravity circle) will be shifted to the lower side.
6
What will overloading an aerial apparatus do to the gravity circle?
It will cause the gravity circle to expand, possibly beyond the base of stability.
7
What are the most common stabilizer devices on an aerial apparatus?
-straight jack (extend down from corners of chassis)
-A frame/X (extend down and away from chassis)
-Box (extend straight away from truck, then straight down; most common in newer aerials)
8
To deploy stabilizers/aerial device, the hydraulic system must be engaged. How is this done?
By activating the power take-off switch (PTO).
9
What are the 4 types of PTO activation switches?
-pneumatic (needs 50 to 140 psi)
-electric
-hydraulic
-combination of these three
10
What is the PTO system?
A rotating shaft that transfers the power from the engine to the auxiliary equipment.
11
What is a Jake Brake?
It alters a diesel engines compression in order to slow the vehicle.
12
What switch is used to provide hydraulic power to the stabilizing system?
The selector valve.
13
What are the 2 ways that a raised aerial apparatus can be uneven?
-laterally (side to side, easiest to correct)
-longitudinally (end to end)
14
Correction of lateral unevenness can be achieved on what grades?
Up to 5 or 6 percent.
15
If an aerial apparatus is stabilized on a hill, on what side should the aerial device be raised?
Over the uphill side of the apparatus.
16
When the aerial apparatus is setting up on a longitudinal grade, how should the aerial device be operated?
Directly over the front or the rear of the vehicle.
17
