Interpretation ID: aiam1670
Manager of Engineering
Vulcan Trailer Manufacturing Co.
P.O. Box 5099
Pratt City Station
Birmingham
AL 35214;
Dear Mr. Chandler: This responds to Vulkan's (sic) November 7, 1974, question whether it Model FTD-6540 'drop deck platform' trailer qualifies as a 'Heavy hauler trailer' which is not subject to the requirements of Standard No. 121, *Air brake systems*, until September 1, 1976. 'Heavy hauler trailer is defined in S4. of the standard as follows:; >>>'Heavy hauler trailer' means a trailer with one or more of th following characteristics:; (1) Its brake lines are designed to adapt to separation or extension o the vehicle frame, or; (2) Its body consists only of a platform whose primary cargo-carryin surface is not more than 40 inches above the ground in an unloaded condition, except that it may include sides that are designed to be easily removable and a permanent 'front-end structure' as that term is used in S 393.106 of this title.<<<; From the description you enclosed, it appears that the FTD-6540 mode has a primary cargo-carrying surface that is not more than 40 inches above the ground in the unloaded condition, and that it would therefore not be required to meet the standard until September 1, 1976.; It should be emphasized that the 40-inch height is an absolute limi for regulatory purposes, and that reliance on a design height of 40 inches will probably result in the production of some non- complying vehicles due to variations in manufacture. A maximum civil penalty of $1,000 is authorized for each such non- compliance (15 U.S.C. S 1398(a)).; Yours truly, Richard B. Dyson, Acting Chief Counsel