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Interpretation ID: aiam1513

Mr. Burt Weller, Engineering Manager, Truck Trailer Manufacturers Ass., 2430 Pennsylvania Avenue, N.W., Washington, DC 20037; Mr. Burt Weller
Engineering Manager
Truck Trailer Manufacturers Ass.
2430 Pennsylvania Avenue
N.W.
Washington
DC 20037;

Dear Mr. Weller: This is in response to your letter of May 29, 1974, concernin paragraph S5.3.2 of Federal Motor Vehicle Safety Standard No. 121, *Air brake systems*.; When a full trailer is tested for compliance with S5.3.2, the wheels o the steerable axle(s) cannot lock up at speeds above 10 mph except for controlled lockup of wheels allowed by an antilock system.; Yours truly, Richard B. Dyson, Assistant Chief Counsel