Document ID: chunk:federal_register_of_legislation:F2022C00813:reg:300:p13
Version: federal_register_of_legislation:F2022C00813
Segment Type: reg
Provision Reference: reg 300 (pt 13/27)
Character Range: 104448–107373

minimised after the intermediate fix;

(e)         not utilise the 15% horizontal gradient provisions of PANS-OPS Vol II paragraph 2.8.4 for sector procedures except in the final segment.

8.3.2.3              The navigation tolerances applicable to the facility which may be used to assist azimuth guidance are contained in ICAO PANS-OPS Chap 2, as are those applicable to DME. The GPS fix tolerance is 2NM for segments at or beyond 25NM from the nominated reference aid (based on GPS receiver operating in the en-route mode) and 1 NM for segments within 25NM of the nominated reference aid (based on the receiver operating in the terminal mode).

8.3.3                   Obstacle Clearance

8.3.3.1              Minimum obstacle clearance is as follows:

(a)         initial approach and en-route segments – 1,000 ft;

(b)         intermediate approach segment – 500 ft;

(c)          final approach segment – 300 ft.
Note: 1. No allowance may be made in the final segment MOC for the use of a FAF.
 2. When determining the height of terrain from contours, the next highest contour to that included in this splay will be used for clearance purposes.

8.3.4                   DME/GPS Steps

8.3.4.1              These steps are determined by the radius of an arc drawn from the DME beacon or GPS reference waypoint through the primary and secondary areas. It will determine the passage of obstruction and/or control area steps or boundaries significant to the last prescribed altitude. To this radius is applied the appropriate DME or GPS fix tolerance as specified in paragraph 8.3.2.3.

8.3.4.2              Except in cases of control area boundaries, DME/GPS steps will provide descent to altitudes lower than the lowest safe altitude for the route segment.

8.3.4.3              The design of the steps should be such as to ensure that an aircraft will be able to conduct a normal type of descent without detriment to the efficiency of the procedure. For instance, the steps should be so arranged that a steady descent will result, rather than a series of steps, which if followed by an aircraft, would require large variations in the rate of descent. Figure 8‑20 shows an example of good design.
Figure 8‑20: DME/GPS arrival steps

8.3.5                   Minimum Altitudes

8.3.5.1              The minimum altitudes applicable to DME/GPS arrivals will normally be the circling minimum altitudes associated with the azimuth facility. In many cases, however, it is not possible for an aircraft to descend to these altitudes, due to limitations imposed by preceding DME/GPS steps. In such cases a higher MDA may be necessary. Depending on the direction of approach it may be decided to integrate the DME/GPS arrivals with a procedure already prescribed in AIP DAP.

8.3.6                   Missed Approach

8.3.6.1              The MAPT is either the azimuth facility or a point prior to this facility, and is identified