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AC 150/5300-4B CHG 3 Appendix 9 12/5/78 upward from the starting point at a slope of 34 (horizontal) to 1 (vertical). In the plan view, the,centerline of this surface extends 10,000 feet (3 000 m) along the extended runway center- line. This surface extends laterally 500 feet (150 m) on each side of the centerline at the starting point 200 feet (60 m) out from the runway approach threshold, and increases uniformly to 2,000 feet (600 m) on each side of the centerline at the end of this surface. (See Figures 1 and 2.) If the instrument approach procedure is to utilize an offset localizer with an offset angle of 3 degrees or less, the above surface is centered upon tha final approach course rather than the extended runway centerline. (See Figure 3.) (4) Approach End of Runways Expected to Accommodate Category II Landing Minimums. The criteria set forth in AC 120-29, Criteria for Approving Category I and Category II Landing Minima for FAR Part 121 Operators, are to be satisfied. b. If the runway end has a Category I glide slope, the vertical distance between the runway approach threshold and the straight line extension of the glide slope (threshold crossing height (TCH)) should also be considered in establishing the runway approach threshold. The following tolerances apply: (1) From 50 (15 m) to 60 (18 m) feet where Category D turbojet aircraft with a gross weight of 20,000 pounds (9 072 kg) or more operate or are programmed to operate. (2) From 40 (12 m) to 60 (18 m).feet where Category D turbojet aircraft with a gross weight of 20,000 pounds (9 072 kg) or more do not operate or are not programmed to operate. o. Displacement or relocation of thresholds should be initiated only after a full evaluation reveals that it is the most appropriate solution. (See paragraph 5b.) 7. MARKING AND LIGHTING THE THRESHOLD. Once the location of the approach threshold is determined, it should be marked and lighted in accordance with AC 150/5340-1, Marking of Paved Areas on Airports, and AC 150/5340-24, Runway and'TPxiway Edge Lighting System. Page 6 Par 6 •