Chapter 17 Flashcards
For sufficient and safe fire control the driver/operator should?
Must work together with other driver operators to ensure that the aerial apparatus are positioned for maximum use and minimum stress to the aerial devices
Placement of aerial apparatus must consider many things including?
Aerial objective, placement of the turntable, scene conditions, and proper stabilization
The 5 story rule will only work in areas that?
Have sufficiently wide streets and that are not set too far back from the street
The 5 story procedure assumes that the department is operating aerial devices with a reach of?
100 ft this may have to be adjusted for fire departments that operate aerials with reaches of less or greater than 100 ft
For any given situation the proper distance between the objective and the aerial apparatus is?
The distance that affords maximum stability, the best climbing angle, and adequate extension
What places the maximum amount of stress on an aerial device and, in some cases, reduces its load carrying capacity?
Long extensions at low angles
It is not advisable to park within the buildings collapse zone if?
The building has been exposed to severe fire conditions or has otherwise been weakened
Spotting refers to?
Positioning the apparatus in a location that provides the utmost efficiency for operating on the fireground
What are some factors the driver/operator must consider for determining the final operating position of the aerial apparatus?
Surface conditions, grade, windy conditions, electrical hazards and ground or overhead obstructions, angle and location of aerial operation, special situations
Apparatus can be parked on soft surfaces in what situations?
Only as a last alternative
What is a good indicator of underground voids?
Manhole covers
If operators are unsure if the surface can withstand the use of aerial apparatus the driver/operator should?
Err on the side of caution
What is a primary spotting consideration with hot weather?
Extreme heat may tend to weaken marginal or otherwise firm paved surfaces
What is one visual indicator of a compromised asphalt surface due to extreme heat?
The asphalt “bleeds” creating a shiny, glass-like surface
What must the driver/operator consider when positioning with the front of the apparatus up hill?
With the rear tires off the ground, the truck has less resistance to sliding downhill. But the rear compartments will be more difficult to reach once the apparatus is leveled
What must the driver/operator consider when positioning with the rear of the apparatus up hill?
It will be easier to reach the ground with a platform operating off the rear of the apparatus. But it will be more likely that the front tires will be lifted off the ground causing the frame rails to sag and making the device more difficult to stow properly after operations are complete
Depending on operational capabilities of apparatus and severity of grade,apparatus with two rear jacks may have to face uphill because?
Facing uphill, the angle of the turntable is decreased thereby increasing capability and stability. If the apparatus was facing downhill the capability of the apparatus may be decreased
When it is necessary to operate in high wind conditions, the driver/operator should spot the apparatus in a manner that?
Minimizes the extension needed
The long standing fire service standard has been to provide how many feet of clearance between the aerial device and overhead high voltage lines energized from 600-50,000 volts?
10 feet
The long standing fire service standard has been to provide at least how many feet for high voltage transmission lines over 50,000 volts?
50 feet
What distance does OSHAs new standard say there should be between the device and overhead electrical lines less than 350 kilovolts?
20 ft
What distance does OSHAs new standard say should be between the device and high tension lines over 350 kilovolts?
OSHA requires 50 ft of clearance
Stability of the aerial apparatus can be improved by?
Operating the aerial device in line with the longitudinal axis (apparatus body) (front to back)
The aerial apparatus is most stable when?
The aerial device is operated directly over the front or rear of the vehicle
At what angle to the apparatus body is aerial apparatus the least stable?
An angle perpendicular to the apparatus is the least stable position
With rear mounted apparatus what is the preferred method of parking?
Backing in apparatus is the preferred method, as this maximizes the reach of the aerial device, as opposed to nosing in the apparatus, which would shorten the possible reach by a distance equal to the length of the apparatus.
Stress in aerial devices is increased when?
The ladder rungs are operated nonparallel to the ground or when the apparatus is parked on an incline and the aerial device must be operated off the side of the apparatus.
When the apparatus must operate off an incline, the driver/operator can reduce these stresses by?
Spotting the turntable downhill from the point of operation
The maximum loading for any unsupported aerial device occurs when?
Operated at angles between 70-80 degrees from horizontal
Aerials are at their weakest operational position when?
Low angle of elevation and at long extension
On high speed roadways, apparatus should not be driven against the normal flow of traffic unless?
The road has been cleared by law enforcement for that purpose?
Most railroad companies advise that vehicles be kept at least how many feet away from the tracks if possible ?
25 feet
If it becomes absolutely necessary to raise an aerial device across a railroad track, the aerial device should be kept at least how many feet above the levels of the rails as an added safety precaution?
At least 25 ft
If it is not possible to locate off the street the driver/operator should position the apparatus?
To shield firefighters from traffic
