NTSB Safety Recommendations R-10-23 and -24

[NTSB Press Releases <NTSBPressReleases@xxxxxxxx>]

Title: NTSB Safety Recommendations R-10-23 and -24

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                   NTSB SAFETY RECOMMENDATION

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National Transportation Safety Board

Washington, DC 20594

August 11, 2010

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NTSB Safety Recommendations R-10-23 and -24

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The National Transportation Safety Board makes the following

safety recommendations to Alstom Signaling Inc.:

Develop and implement periodic inspection and maintenance

guidelines for use by the Washington Metropolitan Area

Transit Authority and other rail transit operators and

railroads equipped with General Railway Signal Company audio

frequency track circuit modules and assist them in

identifying and removing from service all modules that

exhibit pulse-type parasitic oscillation in order to ensure

the vitality and integrity of the automatic train control

system. (R-10-23)

Conduct a comprehensive safety analysis of your audio

frequency track circuit modules to evaluate all foreseeable

failure modes that could cause a loss of train detection

over the service life of the modules, including parasitic

oscillation, and work with your customers to address these

failure modes. (R-10-24)

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http://www.ntsb.gov/recs/letters/2010/R-10-023-024.pdf

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The complete recommendation letter is available on the Web

at the URL indicated above.

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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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