32 Federal Register 13909, October 6, 1967

 TERMINAL INSTRUMENT PROCEDURES (TERPS); IMPLEMENTATION OF U.S. STANDARD

Miscellaneous Amendments to Chapter

                 “The purpose of these amendments o Parts 1, 91, 97, 121, and 135 of the Federal Aviation Regulations is to implement new techniques and criteria associated with the U.S. Standard for Terminal Instrument Procedures, hereinafter referred to as Terps.

 … [T]he notice proposed to immediately convert each present ceiling value in the instrument approach procedures to a minimum decent[sic] altitude or decision height, as appropriate, and replace the present rules with the new rules governing minimum descent altitude (MDA) or decision height (DH).  Comments received in response to this proposal indicated a strong preference for immediate conversion of ceiling values to MDA and DH.  Accordingly precision has been made in 91.116(b) for converting landing ceiling minimums, prescribed in procedures issued under the old criteria, to MDA or DH by summing the ceiling minimum with the field elevation.  The visibility minimum will be the applicable landing minimum, and the descent will be limited by the minimum descent altitude (MDA) or decision height (DH), obtained by summing the prescribed ceiling minimum and published field elevation. (emphasis added)

Where takeoff minimum are presently prescribed in the procedure in terms of ceiling and visibility, the ceiling minimum, as well as the visibility minimum, will continue in effect as a limitation for takeoff pending review and reissuance of the procedure under the revised criteria. When reissued under TERPS, ceiling minimums will no longer be prescribed for takeoff, except for those runways where a ceiling minimum is required to enable to the pilot to see and avoid obstructions.

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             The proposed amendment to Part 97, which provided for deletion of the words “ceiling minimum” wherever it appeared as a limitation on the making of an instrument approach has been deleted, and the provision for summing the ceiling minimum and the field elevation to obtain the MDA or DH has been substituted n 91.116(b).

                Appropriate sections of Parts 121 and 135 have been amended to reflect the reliance on visibility, MDA, and DH, as controlling factors for approach and landing ….” (emphasis added)