NFPA 1911-2007
Standard for the Inspection, Maintenance, Testing, and Retirement of In-Service Automotive Fire Apparatus
TIA Log No.: 959
Reference:
19.8.4.10(7) (New)
Comment Closing Date:
July 17, 2009
Submitter:
Robert J. Barraclough, Plano, TX
1. Add a new subsection to read as follows:
19.8.4.10 (7) For aerial devices that have computer controlled, or electronically controlled, limitations to the range of aerial movement, a test shall be performed to validate the proper operation of the control system, as defined by the manufacturer.
Submitters Substantiation:
In the 2009 edition of the NFPA 1901 standard, a significant change was made to the sections of the standard that establishes the rated capacity for aerial ladders and platforms.
The new standard allows for essentially two types of rating systems, the first being a relatively simple method of rating the ladder in the worst case position. This requires the ladder to be fully extended, in a horizontal position and sustain a minimum rated capacity of 250 pounds for aerial ladders and 750 pounds for elevating platforms. In this position structural safety factors and vehicle stability factors are established. Since 1991, this has been the rating systems for aerials in the United States.
The second aerial rating method is called an envelope control system. These systems utilize electronic control technologies to determine the safe working capacity and range of motion of the aerial device. These systems are widely used in many parts of the world and are derived largely from the German DIN standards and are also reflected in the current EN 14043 standards for aerial ladders.
In response to committee requests, aerial task group meetings were held to better understand the differences in two rating systems. As a result of these meetings and in committee discussions with Fire Apparatus Manufacturer’s Association members this TIA was developed.
Justification:
Due to the design of the envelope control systems, the range of operation of the aerial device is determined by the electronic control systems and these need to be verified by the manufacturer. The NFPA 1901 technical committee feels that the addition of the tests in the new vehicle standard (NFPA 1901) and the testing standard (NFPA 1911) is an important validation of the envelope control systems.
Please email Larry Stewart or stds_admin@nfpa.org with your comments.