IFSTA - Chapter 17

Question 1

Spotting an Apparatus

Answer 1

• 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

Question 2

ing Stabilizer Pads

Answer 2

• 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

Question 3

Vaulted Surfaces

Answer 3

• Ground above underground vaults such as underground parking structures, utility chases, drainage culverts, basements that extend under sidewalks, or underground transportation systems
  PG 615

Question 4

Dynamic Load

Answer 4

• 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

Question 5

Clearance for power lines

Answer 5

• 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

Question 6

Jackknifing

Answer 6

• 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

Question 7

Positioning Aerial on Hill

Answer 7

• When working on an incline, spotting the turntable downhill from the point of operation is best
  PG 622

Question 8

As a group, which type of aerial deice should not be deployed at low elevation and long extension?

Answer 8

Apparatus built prior to 1991
PG 611-612

Question 9

When jackknifing a tractor-trailer apparatus, which placement provides the most stability?

Answer 9

With the deployed aerial device pointing away from the angle created by the tractor and trailer
PG 620

Question 10

An unsupported aerial device can handle maximum load when its angle is _________ degrees from horizontal?

Answer 10

70-80 degrees
PG 622

Question 11

When deployed across a railroad track, an aerial device should be kept a minimum of _________ feet above the rails?

Answer 11

25 feet
PG 627

Question 12

Minimum clearance from overhead powerlines?

Answer 12

• GREATER than 350 kilovolts = 50 feet
• LESS than 350 kilovolts = 20 feet
  PG 617

Question 13

When spotted for aerial device deployment, stability of the tractor-trailer apparatus decreases once the jackknifing angle exceeds _______ degrees?

Answer 13

90 degrees
PG 620

Question 14

How far away from railroad tracks should you park?

Answer 14

25 feet
PG 627

Question 15

Which condition is most likely to create torsional stress on an aerial device?

Answer 15

Maximum extension
PG 621-623