The Bureau of Flight Standards of the Federal Aviation Agency has under consideration a new Part 515 of the Regulations of the Administrator The reasons therefor are set forth in the explanatory statement of the attached proposal which was published today in the Federal Register as a notice of proposed rule making. The Bureau of Flight Standards desires that all persons who will be affected by the requirements of this proposal be fully informed as to its effect upon them and is therefore

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... ting copies in order to afford interested persons ample opportunity to submit comments as they may desire. Because of the large number of comments which we anticipate receiving in response to this draft release, we will be unable to acknowledge receipt of each reply. However, you may be assured that all comment will be given careful consideration. It should be noted that comments should be submitted in duplicate to the Docket Section of the Federal Aviation Agency by April 20, 196lo Thereafter, such comments will be available in the Docket Section to all interested persons, and an additional period will be allowed for submission of further comments in response thereto. In order to insure consideration, such additional comments must be received by May 22, 1961.