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Apparatus Tech > IFSTA Aerial Chapter 3 > Flashcards

IFSTA Aerial Chapter 3 Flashcards

1
Q

Per NFPA 1901 what are three basic categories of aerial devices

A

Aerial Ladders

Elevating Platforms

Water Towers

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2
Q

How is the working height of an aerial ladder measured

A

From the Ground to the Highest ladder rung with the ladder at maximum elevation and extension

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3
Q

what is the minimum floor area for an elevated platform (tower bucket)

A

14 Sqft

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4
Q

Each platform (Tower bucket) must have a rail completely enclosing the floor area. No opening under the railing can be greater than this many inches

A

24”

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5
Q

Below the railing of the aerial platform two gates are provided for FF and victim access, what is required at floor level and how high should it be

A

A kickplate is required at floor level and should be 4 inches high to prevent ff feet from sliding off the platform

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6
Q

All platforms (buckets) are required to have this many operator control stations and where

A

Two controls one at street level and one on the bucket

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7
Q

per NFPA 1901 a protective water fog curtain nozzle is required at the bottom of the platform. NFPA 1901 requires this nozzle to flow at least how many GPMS

A

75 gpm

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8
Q

All elevating platforms must have a minimum weight rating of ________ pounds when the aerial is fully ________ at any _______ within its normal ________ of motion with no ______ in the piping

A

750 lbs

aerial is fully extended at any elevation within its normal range of motion with no water in the piping

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9
Q

When water is added to aerial platform what does the minimum weight rating drop to

A

500 lbs

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10
Q

Elevated platforms must be capable of discharging atleast ____________ when the aerial device is in any position

A

1000 gpm

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11
Q

How fast should platforms 110 feet or shorter be able to to be raised

A

Platforms should be able to be raised from bedded position to its maximum elevation and extension and be rotated 90 degrees in

150 seconds or less

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12
Q

How is the working height of an elevated platform measured

A

Aerial device at maximum extension and elevation from the GROUND to the top surface of the highest platform handrail

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13
Q

What is Box-Beam construction

A

Four sides of steel or aluminum welded together to form a box shape with a hollow center

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14
Q

The supporting beams for an aerial device are made of truss construction. What do properly built trusses permit?

A

Allows for tension and compression stresses to be distributed over the length of the ladder for max strength but minimum weight

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15
Q

Two most common materials that aerial ladders are built with are

A

Heat-Treated aluminum alloy

Steel

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16
Q

How are the fabricated structural members of the aerial fastened?

A

Rivets

Entire truss segment may be welded

Heliarced for aluminum alloy

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17
Q

What is the medium by which force is created to move and operate the aerial system

A

Hydraulic fluid

system is composed of fluid, pump and reservoir

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18
Q

Why is hydraulic fluid used to operate aerial

A

Fluid is practically incompressible and allows force to be transmitted over a relatively large distance with little loss of power

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19
Q

What is the hydraulic fluid reservoir designed to do

A

supply the adequate amount of fluid and condition the fluid while it’s stored in the tank

allows for air, heat and foreign matter to be eliminated from fluid before reintroduction into the hydraulic system

20
Q

Filters and exchange-type coolers are provided to condition the ladder hydraulic fluid, where can the coolers be found

A

Usually located in front of the vehicles radiator

21
Q

What type of tubing is used for hydraulic fluid supply through out the system

how much pressure is it rated to withstand

A

steel tubing and aircraft-type, steel braided hose.

hose must be rated to withstand pressures at least four times greater than normal operating pressure

22
Q

A number of different valves are used within the hydraulic system,

what do these valves do to the fluid

how are they controlled

A

Start, Stop, Regulate and direct the flow of hydraulic fluid to control pressure in the system.

Controlled manually, electrically, hydraulically, mechanically or a combination of all of the above

23
Q

What prevents undesired or unintentional motion of the aerial from its established position

A

Counterbalance valves

24
Q

One of the important valves in the system is the “selector valve” also know as the transfer or diverter valve. how is this valve built and how does it function.

A

Three way valve that directs fluid to either stabilizer controls valves or the aerial control valves

Provides an interlocking mechanism to prevent fluid going to both stabilizers and aerial control valves

25
Q

What does the selector valve include that allows drivers to use functions deemed safe by a microprocessor

A

Electronic interlocks

26
Q

once the selector valve is switched for either aerial or stabilizer operations, what type of valves are found down the line in the system

A

monitor, stack, and proportional directional control valves found in four or five way valves

27
Q

How is hydraulic power from the system turned into mechanical force

A

Actuators found in the form of hydraulic cylinders that convert energy in the system into line mechanical force or motion

when pressurized fluid is directed into a chamber fitted with a piston into a cylindrical barrel

28
Q

what are double acting hydraulic cylinders

A

Used for telescoping or elevation of ladder capable of receiving oil under pressure from both side of the piston so force can be created in either direction

29
Q

NFPA 1901 requires an aux pump in the event of a failure in the main hydraulic pump. How is the aux pump powered and how many volts is it?

A

Wired directly to the vehicles battery using 12v DC

30
Q

What type of cylinders are used to elevate the aerial device

A

Hoisting ~ Elevating ~ Lift

31
Q

What is found at the end of each piston rod outside of the cylinder

A

Trunnion that is anchored to either the aerial device or to the turntable

32
Q

Extension and retraction cables used to extend and retract the fly sections of the aerial are built with

A

Corrosion Resistant aircraft quality cable made with plow steel

resistant to abrasion

33
Q

What is the aerial device turn table decking constructed of

A

Rigid Metal Plates

34
Q

Turntables often operate on ________ bearings. One side of the bearing is fastened to the turntable and the other side to the aerial device structure.

A

Sheer Ball-Type Bearings

35
Q

Sheer ball type bearings are secured by turntable ________ which should be _________ for manufacturers ______ specifications

A

Turntable bearing bolts checked periodically for manufacturers torque specifications

36
Q

What is mounted on the periphery of the turntable that rotates the device

What is it driven by

A

Gear Teeth engaging gears

driven by a mechanical drive, electric or hydraulic motor

37
Q

How high does the operator pedestal stand

A

3.5 feet

38
Q

How should the aerial controls be positioned

A

Extension Rotation Elevation control in order from left to right on the pedestal

39
Q

What are telescoping prepiped water ways made out of

A

Aluminum or other metal with a general minimu diameter of 4 inches

40
Q

at what degree must you avoid operating a ladder pipe

A

90 degrees

41
Q

Hardened steel nozzle provided to some elevated platforms can poke through what material and be flowed at what rate

A

Metal Buildings, Aircraft skins, metal roofs

up to 300 gpms

42
Q

NFPA 1901 requires a _________ communication system

A

Two - Way comms

43
Q

Standards to follow by NFPA 1901 if breathing air is equipped in an elevated platform

A

Number of Firefighters supported by system

Capacity of compressed air cylinders

Pressure Requirements

Low Air Warning alarms

Conformity to government regulations

44
Q

What NFPA establilshed requirements for the quality of air in breathing air systems

A

1989

45
Q

Most common power cord found on portable reels

A

12 gauges, 3 wire type

46
Q

NFPA 1901 requires apparatus to be equipped with ________ covers and _____ shovels

A

multiple salvage covers and two scoop shovels

47
Q

How are hoisting elevating and lift cylinders built

A

Heavy, Seamless steel outer shells bored to an extremely smooth inside surface.

Chrome plated on the inside to resist friction and wear.

enclosed at the top and bottom with removable caps

A solid chrome plated piston rod packed and tightly fitted with rings inside the cylinder

Apparatus Tech (58 decks)

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