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Interpretation ID: aiam1437

Mr. John F. McCuen, Attorney, Kelsey-Hayes Company, Romulus, MI 48174; Mr. John F. McCuen
Attorney
Kelsey-Hayes Company
Romulus
MI 48174;

Dear Mr. McCuen: This responds to your February 1, 1974, request for interpretation o the language 'maximum temperature of 500*+*50 degrees F' appearing in S6.1.8.1 of Standard No. 121, *Air brake systems*, 49 CFR 571.121.; The language is intended to specify a temperature range within which t conduct the burnishing procedure in the event brake applications cause the hottest brake on a vehicle to reach 500 degrees F. The word 'maximum' is inappropriate and will be deleted in an upcoming notice responding to petitions that raised the same point.; Yours truly, Richard B. Dyson, Assistant Chief Counsel