NTSB makes safety recommendations to NHTSA.
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Press Release Summary:
According to NTSB, the NHTSA should develop stability control system performance standards for commercial vehicles and buses with GVW rating greater than 10,000 lb. Administration should also establish minimum rollover performance standards, based on least stable condition operated, for all new cargo tank motor vehicles with GVW greater than 10,000 lb, and evaluate effect of emergency maneuvers on sloshing and surging of bulk liquids with various densities in partially filled US DOT cargo tanks.
Original Press Release:
NTSB Safety Recommendations H-11-7 through -12 and H-10-5 and -6
The National Transportation Safety Board makes the following recommendations to the National Highway Traffic Safety Administration:
Develop stability control system performance standards for all commercial motor vehicles and buses with a gross vehicle weight rating greater than 10,000 pounds, regardless of whether the vehicles are equipped with a hydraulic or a pneumatic brake system. (H-11-7) This recommendation supersedes Safety Recommendation H-10-5.
Once the performance standards in Safety Recommendation H-11-7 have been developed, require the installation of stability control systems on all newly manufactured commercial vehicles with a gross vehicle weight rating greater than 10,000 pounds. (H-11-8). This recommendation supersedes Safety Recommendation H-10-6.
Establish comprehensive minimum rollover performance standards, based on the least stable condition operated, for all newly manufactured cargo tank motor vehicles with a gross vehicle weight rating greater than 10,000 pounds. (H-11-9)
Once the performance standards in Safety Recommendation H-11-9 have been developed, require that all newly manufactured cargo tank motor vehicles with a gross vehicle weight rating greater than 10,000 pounds comply with the performance standards. (H-11-10)
Evaluate the effect of emergency maneuvers on the sloshing and surging of bulk liquids that have various densities over a range of partially filled levels in a U.S. Department of Transportation specification cargo tank. (H-11-11)
If the results of Safety Recommendation H-11-11 warrant action, establish and implement performance standards for mitigating the sloshing and surging of bulk liquids in all newly manufactured cargo tank motor vehicles with a gross vehicle weight rating greater than 10,000 pounds. (H-11-12)
In addition, Safety Recommendations H-10-5 and -6 to NHTSA are classified "Closed-Superseded" in the "Stability Control Systems" section of the accident report's Analysis.
The NTSB also issued safety recommendations to the DOT, PHMSA, the FMCSA, the Federal Highway Administration, and the American Association of State Highway and Transportation Officials (AASHTO). Additionally, this report reclassifies a previously issued recommendation to AASHTO.
http://www.ntsb.gov/doclib/recletters/2011/H-11-007-012.pdf
The complete recommendation letter is available on the Web at the URL indicated above.
The letter is in the Portable Document Format (PDF) and can be read using the Acrobat Reader 5.0 or later from Adobe (http://www.adobe.com/prodindex/acrobat/readstep.html).
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Electronic versions of letters may or may not include enclosures; however, related publications, accident briefs, and aviation accident synopses may be found on the NTSB website.
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