Chp 17 Positioning Aerial Flashcards
No hard and fast rules for positioning aerials
Some depts develop SOP’s to help
Done during pre planning
Placement considerations
Aerial objective
Placement of the turntable
scene conditions
Proper stabilization
Possible scenarios
2 arrive, one goes front, one goes rear
2 arrive, one follows SOP, one waits at intersection
1 arrive, center of involved area for offense, clear of collapse (corner) for defense
Distance from bld
Whatever gives best stability, climbing angle and extension
Trucks older than 1991
Don’t use at low elevation and long ext. Not good for any truck but these weren’t designed for it.
Positioning considerations when spotting
Surface conditions
Grade
Wind conditions
OH obstructions
Angle of operation
Special situations
Surface conditions
Use soft ground as last resort, watch for settling
Become soft: frozen ground, dry soil, thin asphalt especially if it gets hot (parking lots, look for bleeding)
Underground vaults: parking structure, utility, drainage, basements, subway, manhole covers
Grade
If uphill, back tires can’t stop sliding downhill and can’t reach rear compartments
If downhill can reach compartments but frame rails sag when front tires lifted
If 2 rear jacks, may need to face uphill
Uneven jacking s/b with single chasis trucks designed to be lifted off the ground
Windy conditions
Applies unintended loads and magnifies other loads
Position to minimize extension
Deploy aerial over the front or back, parallel to wind
Mfg had predetermined wind loads
Electricity and obstructions
Avoid cars and garbage cans
Mind step potential (may be 150’)
No overhead lines are insulated and can arc 10’
10’ clearance for normal (now 20), 50’ for high voltage 50k
Use lights to search for powerlines if its dark
If app gets energized, stay inside
Angle of aerial deployment
Most stable over front or back so consider placing to extend that way
For rear mounted back in to maximize reach, for midmount nose in
When on a hill
Going uphill is best, stop short and fly over the cab
Going downhill drive past and fly off the back
If only 2 jacks, always face uphill
Supported tip
Follow mfg recommendations
Maximum loading for unsupported tip is 70-80*
Approaching considerations
Be careful around pedestrians
Avoid narrow or one way streets
Uphill upwind
Minimize anglr and ext
Don’t block the scene
Back into dead end streets
Mind exhuast and noise for victims (shut down if only support)
Staging
SOPs help
Or use Level I and Level II
