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SAFETY
1-12 / Mid-Mount Ascendant Aerial Tower
© 2021 Pierce Manufacturing Inc. All Rights Reserved.
Body Collision
The device will not move into regions where it would make contact with the apparatus body or cab.
Rotation Interlock (Short-Jack)
The aerial device will not rotate over the side of the apparatus where the stabilizers are not fully extended.
Maximum Elevation Slow-Down
The device will slow down prior to reaching maximum elevation or extension.
Aerial Function Interlocks
The aerial device will not operate until the parking brakes have been set and the transmission has been placed in
neutral or the transmission is in the drive position with the driveline to the rear axle disengaged.
1-9. Safe Aerial Set-Up
1-9.1 Aerial Apparatus Positioning
Selecting the right location to set up your aerial apparatus when arriving on scene is one of the most important
decisions you will make. You must anticipate what you will be doing with your apparatus and identify areas where it
can be positioned so that the aerial can reach the final position without exceeding its reach and capacity. Your aerial
apparatus is very heavy, and it must have ground under it that will support its weight during all operations. Your
selected position must meet all of the following safe positioning criteria:
•
Surface must be firm and stable. Stability cannot be assured on grass, dirt, hot asphalt, etc… Avoid loose
objects, underground utility access covers, chambers, pipes, culverts, broken pavement and areas that drop off
suddenly.
• Apparatus must be able to be leveled within the safe operating limits.
• Set-up area should ensure clearance from power lines during operation.
• Position clear of areas exposed to fire or falling debris.
• Always use warning lights when positioning in traffic.
• Never position on or near a railroad track or an active airport runway.
1-9.1a Ground Bearing Support
Every aerial apparatus designed in compliance with NFPA 1901;
“Standard for Automotive Fire Apparatus”
must not
exceed 75 pounds per square inch (psi) of pressure between each stabilizer pad and the ground. This means that
the ground you set up on must be able to support 75 pounds per square inch. The pressure that ground will support
depends on many factors including the soil type (clay, loam, sand, etc…) and the moisture content. When planning
for emergencies in your response area, consider engaging an engineering firm who can measure the load-bearing
capability of typical soils in your area so that you are prepared to select a safe location when the time comes to
respond.