18 Stabilizing The Apparatus Flashcards
Theoretical safety zone that surrounds the center of gravity on aerial apparatus
Gravity circle
If the apparatus is parked on a lateral slope the center of gravity will be shifted to what side
Lower side
Also called downrigger’s type of stabilizer that extends down from the chassis
Post Type stabilizers
Type of stabilizer that extend straight away for the truck and have Jack’s that extend the straight down
Box stabilizers, a.k.a. H stabilizers
Also called fulcrum stabilizers, extend down and away from the chassis at an angle
A-frame, scissor, X style stabilizers
Type of PTO that is able to being engaged when the main transmission is in neutral
Hot shift PTO system
Whenever possible position the aerial device before activating what
Fire pump
If the pump is already engaged and operating what needs to be done to activate the PTO for aerial device
Throttle down to idle
How much space should be between a wheel chock and tire
Proximately 1 inch
Which wheels on the apparatus should be chalked
Manufacture recommendation, both sides of the tire both sides of the apparatus
If there is any doubt as to whether or not there is room for stabilizers to deploy what can be used to estimate travel path
Short pike pole, closet hook, arm span
Metal plate attached to the bottom of the aerial apparatus stabilizer to provide firm footing on the surface
Stabilizer shoe
True false driver can operate more than one control for stabilizers at a time
True
Most common type of stabilizer used on newer apparatus
Box stabilizer
How large are stabilizer pads
Usually 24 x 24”
I’m placing stabilizers by yourself how do you bear the weight of the apparatus
One side at a time incrementally taking weight from one side then the other
Downside of fulcrum type stabilizers
Can either be fully deployed or not at all
Between the two types of unevenness laterally, or longitude, which of the two is the easiest to correct while stabilizing
Lateral unevenness, side to side
Correction of lateral unevenness as possible on grades up to what degrees
Up to 5°
When operating with lateral unevenness which side is the preferred side of aerial extension
Uphill side
When setting jacks on a lateral grade what side gets lowered first just touching
Uphill side
Whenever possible operators should avoid placing stabilizers on what street objects
Curbs, sidewalks, parking lots, valve covers, obstructions
What type of road surfaces should be avoided
Unpaved sand or gravel
Ice snow and frozen patches are potential stability issues because
They may melt and create void spaces under the stabilizers
On frozen ground services the aerial device may slip what can be done to avoid this
Chocks or sand
Why should so be avoided when placing aerial device is
May melt the snow or ice producing contact of stabilizers
For stabilizers without pins, what locks them.
Hydraulic interlock valves that prevent fluid from bleeding out of the stabilizer
To prevent the Chocks from being stuck when lowering the stabilizers what can be done
Move Chocks back slightly before lowering stabilizers
Tractor drawn tillers should not position the cab greater than what degrees to prevent poor stability
Greater than 90°
Even if raising aerial tilting the cab what should be raised to a eliminate suspension stress
Stabilizers
