Spotting an Apparatus
- Positioning the apparatus in a location that provides the utmost efficiency for operating on the fireground
- Positioning a ladder to reach an object or person
PG 613
ing Stabilizer Pads
- Unattached, flat metal plate that is larger in area than the stabilizer foot
- Placed on the ground beneath the intended resting point of the stabilizer foot, in order to provide better weight distribution
- AKA Jack Pad or Jack Plate
PG 614
Vaulted Surfaces
- Ground above underground vaults such as underground parking structures, utility chases, drainage culverts, basements that extend under sidewalks, or underground transportation systems
PG 615
Dynamic Load
- Loads that involve motion
- They include the forces arising from wind, moving vehicles, earthquakes, vibration, or falling objects, as well as the addition of a moving load force to an aerial device or structure
- AKA Shock Loading
PG 616
Clearance for power lines
- 10 feet of clearance between aerial device and overhead HIGH VOLTAGE lines 600-50,000 volts
- 50 feet of clearance between aerial device and overhead HIGH VOLTAGE TRANSMISSION lines over 50,000 volts
PG 617
Jackknifing
- Condition of a truck tractor/semitrailer combination where their relative positions to each other form an angle of 90 degrees or less about the trailer kingpin, such as turning the tractor portion of a tractor-tiller aerial apparatus an an angle from the trailer to increase stability when the aerial device is being used
- Greatest stability is created when the angle is 60 degrees from in-line and the aerial device is extended away from this angle
- Good stability is up to 90 degrees
PG 620
Positioning Aerial on Hill
- When working on an incline, spotting the turntable downhill from the point of operation is best
PG 622
As a group, which type of aerial deice should not be deployed at low elevation and long extension?
Apparatus built prior to 1991
PG 611-612
When jackknifing a tractor-trailer apparatus, which placement provides the most stability?
With the deployed aerial device pointing away from the angle created by the tractor and trailer
PG 620
An unsupported aerial device can handle maximum load when its angle is _________ degrees from horizontal?
70-80 degrees
PG 622
When deployed across a railroad track, an aerial device should be kept a minimum of _________ feet above the rails?
25 feet
PG 627
Minimum clearance from overhead powerlines?
- GREATER than 350 kilovolts = 50 feet
- LESS than 350 kilovolts = 20 feet
PG 617
When spotted for aerial device deployment, stability of the tractor-trailer apparatus decreases once the jackknifing angle exceeds _______ degrees?
90 degrees
PG 620
How far away from railroad tracks should you park?
25 feet
PG 627
Which condition is most likely to create torsional stress on an aerial device?
Maximum extension
PG 621-623
