ch. 18 Stabilizing the apparatus

Question 1

Ch. 18 pg. 642
Deploying the aerial device without the use of the stabilizers limits the stability to the rectangle formed at each corner by the tires of the apparatus. This limited base of stability is undesirable because of the:

Answer 1

inherent flexibility of the suspension and tires.

Question 2

Ch. 18 pg. 642
By deploying the apparatus stabilizers, the base of stability for the aerial apparatus is effectively increased. What should be used every time the stabilizers are deployed?
A. Cones to mark area around the apparatus
B. Warning lights
C. Stabilizer pads
D. Leveling system

Answer 2

C. stabilizer pads.

Stabilizer pads (also called jack plates)

Question 3

Ch. 18 pg. 642
By deploying the apparatus stabilizers, the base of stability for the aerial apparatus is effectively increased. The apparatus should remain stable while operating the aerial device as long as the center of gravity remains inside:

Answer 3

Gravity circle.

theoretical safety zone that surrounds the center of gravity on a aerial apparatus.

Question 4

Ch. 18 pg. 643
New apparatus are equipped with __________ that prevent the movement of the aerial device to the short-jacked side. However the D/O should not rely on these automatic features to prevent a serious accident from occurring.

Answer 4

Limit switches.

Ch. 16 pg. 549 talks about counterbalance valves preventing unintentional or undesirable motion of the devices from its established position.

Question 5

Ch. 18 pg. 645.
The process of engaging the PTO is fairly similar for all types of aerial apparatus. The type of PTO switch activation varies from manufacturers. Activating a pneumatic systems requires air pressure in the range of ____________ for the PTO to be operated.

Answer 5

50-140 psi

Question 6

Ch. 18 pg. 652
Before the actual deployment of the stabilizers, D/O should conduct some preliminary checks. After the wheel chocks are deployed the D/O should be observant of the following obstructions when deploying the stabilizers. (6)

Answer 6

• other vehicles
• utility poles
• hoselines
• fences
• signs
• other personnel operating on the scene.

Question 7

p.658 Short Jacking
+The load and range of safe movement capabilities significantly __ if the extension arms are not extended to their maximum positions.
+Whenever possible,a __officer should observe aerial operations when short jacking is in use.

Answer 7

Decrease

Safety Officer

Question 8

p.658 Short Jacking
+The load and range of safe movement capabilities significantly __ if the extension arms are not extended to their maximum positions.
+Whenever possible,a __officer should observe aerial operations when short jacking is in use.
+Waterway operations should be conducted with caution in short jacking situations, the nozzle reactions actually transfers__ to the opposite side.

Answer 8

Decrease
Safety Officer
Weight

Question 9

p.658 Stabilizing on Uneven Terrain
+2 ways truck can be uneven:
-Laterally uneven (side to side)
-Longitudinally uneven (End to end)
+Of the 2, the easiest to correct is___.
+Correction of Lateral unevenness is possible on grades of up to _ degrees
+Operating aerial device over the__ side is preferred.

Answer 9

Lateral unevenness

5 percent (3 degrees)
*(Slope of 5 degrees means there is a rise in terrain height of 5 feet for every run of 100 feet) 

Uphill

Question 10

p.659 Longitudinal Grades
+If the aerial turntable is not level, the rungs of the aerial device will not be exactly__ to the ground if the device is positioned over the side of the apparatus.
+This lack of parallel operation will generate lateral and torsional stresses within the structure of the aerial device when it is raised and cause firefighters to be unsteady while working on it.

Answer 10

Parallel

Question 11

p.661 Stabilizing on Unstable Surfaces
+Some concrete construction is not reinforced with rebar and__ cause unnecessary unevenness of the stabilizers. These situations should be treated the same as setting up on a lateral incline.

Answer 11

Curbs

Question 12

p.661 Stabilizing on Ice
+When the ground is frozen and the surface is on an angle, the aerial device can move or chatter along the surface due to the combination of__ and __;

Answer 12

Vibration and Gravity

operators can prevent this through the use of wheel chocks.
Sand or other friction enhancing products can be carried aboard the aerial to assist in a secure planting of the stabilizer.

Question 13

p.662 Locking the Stabilizer
+Combination of the interlock feature on the__ valve and the hydraulic systems__ valves provide automatic locking capabilities.

Answer 13

Selector

Holding

Question 14

Ch. 18 pg. 663.
The D/O should also check around the entire apparatus to make sure that all personnel and equipment are clear of the apparatus before retracting the stabilizer.
The D/O should always rais the stabilizers following:

Answer 14

The reverse order by which they were deployed whether on level or uneven terrain.
Following the reverse order avoids undue stress on ay component of the aerial apparatus.