IFSTA - Chapter 18

Question 1

Gravity Circle

Answer 1

• Theoretical safety zone that surrounds the center of gravity on an aerial apparatus
  PG 642

Question 2

Post-Type Stabilizers

Answer 2

• AKA Downriggers
• Straight jacks that extend down from the chassis
  PG 644

Question 3

Box Stabilizers

Answer 3

• AKA H-Stablizers
• Stabilizers that extend straight away from the truck and have jacks that extend straight down to the ground
• Most common stabilizers used on newer apparatus
  PG 644

Question 4

A-Frame, Scissor, or X-Style Stabilizers

Answer 4

• AKA Fulcrum-Type Stabilizers
• Stabilizers that extend down and away from the chassis at an angle
  PG 644

Question 5

Stabilizers Shoe

Answer 5

Flat metal plate attached to the bottom of the aerial apparatus stabilizer to provide firm footing on the stabilizer surface
- AKA Stabilizer Boot or Stabilizer Foot
PG 652

Question 6

Order of Deploying Stabilizers

Answer 6

• One stabilizer should never be activated alone
• Always activate in a multi-step, side-to-side or front-to-back process
• In a four-jack system, operate the stabilizers in parallel
  PG 656

Question 7

Short Jacking

Answer 7

• Partial extension of the stabilizer arms
• The load and range of save movement capabilities significantly decrease when extension arms are not fully extended
  PG 658

Question 8

Stabilizing on Uneven Terrain

Answer 8

1) Laterally:
- Correction of lateral unevenness is possible on grades of up to 5%/3 degrees (a slope that rises 5 feet for every 100 feet of distance)
- Lower stabilizers of uphill side first, then lower downhill stabilizers until they raise the downhill side of the truck is level with the uphill side
- Preferable to operate aerial device over the uphill side of apparatus
2) Longitudinally:
- Operate the aerial device either directly over the front or rear of the apparatus, depending on whether the apparatus stopped short of the objective or past it
PG 649-650

Question 9

Steel Pins are used as a safeguard to prevent movement of the jacks for which type of stabilizer system?

Answer 9

Box
PG 662-663

Question 10

What is the final step in engaging a PTO on an aerial apparatus equipped with an automatic transmission and no pump?

Answer 10

Shift transmission to neutral
PG 647

Question 11

What is the maximum lateral grade that can be corrected with stabilizers?

Answer 11

5 degrees
PG 658

Question 12

A hot shift PTO differs from standard PTO because the hot shift PTO can be engaged with the ________ ?

Answer 12

Main transmission in neutral
PG 646

Question 13

Which type of stabilizer must be fully extended to be effective?

Answer 13

Fulcrum
PG 657

Question 14

What problem is particularly severe when working on a longitudinal grade?

Answer 14

Higher lateral and twisting stresses on the aerial device
PG 659-660

Question 15

When short jacking, the stabilizers should be fully extended on which side?

Answer 15

The same side the device will be extended
PG 658

Question 16

When spotting a tractor-trailer aerial apparatus, maximum stability is achieved when the aerial device will be deployed _________ ?

Answer 16

Outside the angle created by the tractor and trailer
PG 665

Question 17

When operating an aerial device with manual stabilizers, a stabilizer shoe lifts off the pad. What should be done?

Answer 17

Take no action
PG 664