Interpretation ID: aiam2039

Mr. Edward L. J. Young, Director, Engineering, Lear Siegler, Inc., Neway Division, P.O. Box 425, Muskegon, MI 49443; Mr. Edward L. J. Young
Director
Engineering
Lear Siegler
Inc.
Neway Division
P.O. Box 425
Muskegon
MI 49443;

Dear Mr. Young: I appreciate your letter of August 13, 1975, forwarding a copy o Neway's publication on Standard No. 121, *Air Brake Systems*. The efforts of companies like Neway to assist final-stage manufacturers in their certification responsibility has been an important part of the implementation of the air brake systems standard.; You asked for review of the booklet, which consists mainly o instructions to manufacturers concerning systems that must be tested and how to establish a basis for certification. This is an area which our statutory scheme leaves to the manufacturer, and in which, aside from discussions of general principles, this agency declined to issue statements of approval. While we appreciate the usefulness of the advice contained in your booklet, we regret that we can not judge the adequacy of a certification program in the abstract.; Yours truly, Richard B. Dyson, Assistant Chief Counsel