Document ID: chunk:federal_register_of_legislation:F2022C00813:reg:300:p2
Version: federal_register_of_legislation:F2022C00813
Segment Type: reg
Provision Reference: reg 300 (pt 2/27)
Character Range: 74806–77660

50 m;

(b)         for RVR values greater than 800 m and visibility values up to 1,000 m the calculated values must be rounded-up to the nearest multiple of 100 m;

(c)          for visibility values greater than 1,000 m, the calculated value must be rounded-up to the nearest multiple of 200 m.

Exception. For runway approaches it must not be less than the minimum values permitted at paragraphs 8.1.6.1B, 8.1.6.1C, 8.1.6.2A, 8.1.14 and 8.1.15.
Note:  The rounding in paragraph 8.1.7.1 may give inappropriate values when determining visibility for foreign procedures. In such cases, the value determined under paragraph 8.1.6 may be rounded to any value within the following range:
 1. for RVR values up to 800 m =  25 m;
 2. for RVR values greater than 800 m =  50 m;
 3. for visibility values greater than 1,000 =  100 m

8.1.7.2              DA/MDA. The State DA/MDA must not be less than any of the following:
(a)         the OCA determined in accordance with ICAO PANS‑OPS Vol II or ICAO Doc 9905 for RNP AR APCH and paragraph 8.1.5;
(b)         the visual segment limitations contained in paragraph 8.1.4;
(c)          the OCA plus any margin deemed necessary to account for poor ground equipment performance or local conditions;
(d)         for Category I operations — threshold elevation plus 200 ft;
(e)         for SA Category I operations — threshold elevation plus 150 ft;
(f)            for Category II and SA Category II operations — threshold elevation plus 100 ft.

8.1.7.3              RA Height. A radio altimeter (RA) height must be determined and published for each SA Category I, SA Category II and Category II instrument flight procedure.
Note: A DH or RA height is not required for Category III procedures. If an operator's approval requires use of a DH for a particular Category III operation, the flight crew will apply the DH specified in the approval.

8.1.8                   Aerodrome Operating Minima (AOM)

8.1.8.1              AOM must be the higher of the OCA corrected for the factors listed in ICAO Annex 6 or the State DA/MDA. For precision approaches, the State DA must be adjusted for pressure error to determine the AOM. Aircraft pressure error correction must be applied or, alternatively, at least 50 ft added to the DA.

8.1.9                   General Alternate Minima

8.1.9.1              The general alternate minima must be calculated by adding the tolerance for the forecast ceiling and visibility to the circling minima (500 ft and 2 km).

8.1.10              Special Alternate Minima

8.1.10.1         Airborne Equipment. Special Alternate Minima are available only for operations by aircraft with dual ILS/VOR navigation capability (that is, with duplicated LLZ, G/P, Marker and VOR receivers). Although not specified and not required, it is assumed that such aircraft will also have duplicated ADF