Specifications

ST. PETERSBURG FIRE & RESCUE
AIR / LIGHT APPARATUS
SVI #865 PRODUCTION SPECIFICATION
SVI #865 04/26/13
58
WARNING LIGHT PACKAGE
Each apparatus shall have a system of optical warning devices that meets or exceeds the requirements of this section.
The optical warning system shall consist of an upper and a lower warning level. The requirements for each level shall be
met by the warning devices in that particular level without consideration of the warning devices in the other level.
For the purposes of defining and measuring the required optical performance, the upper and lower warning levels shall be
divided into four (4) warning zones. The four zones shall be determined by lines drawn through the geometric center of
the apparatus at 45 degrees to a line drawn lengthwise through the geometric center of the apparatus. The four (4) zones
shall be designated A, B, C, and D in a clockwise direction, with zone A to the front of the apparatus.
Each optical warning device shall be installed on the apparatus and connected to the apparatus’s electrical system in
accordance with the requirements of this standard and the requirements of the manufacturer of the device.
A master optical warning system switch that energizes all the optical warning devices shall be provided.
The optical warning system on the fire apparatus shall be capable of two (2) separate signaling modes during emergency
operations. One (1) mode shall signal to drivers and pedestrians that the apparatus is responding to an emergency and is
calling for the right-of-way. One (1) mode shall signal that the apparatus is stopped and is blocking the right-of-way. The
use of some or all of the same warning lights shall be permitted for both modes provided the other requirements of this
chapter are met.
A switching system shall be provided that senses the position of the parking brake or the park position of an automatic
transmission. When the master optical warning system switch is closed and the parking brake is released or the automatic
transmission is not in park, the warning devices signaling the call for the right-of-way shall be energized. When the master
optical warning system switch is closed and the parking brake is on or the automatic transmission is in park, the warning
devices signaling the blockage of the right-of-way shall be energized. The system shall be permitted to have a method of
modifying the two (2) signaling modes.
The optical warning devices shall be constructed or arranged so as to avoid the projection of light, either directly or
through mirrors, into any driving or crew compartment(s). The front optical warning devices shall be placed so as to
maintain the maximum possible separation from the headlights.