Document ID: chunk:federal_register_of_legislation:F2022C00813:front:0:p23
Version: federal_register_of_legislation:F2022C00813
Segment Type: other
Provision Reference: 
Character Range: 64687–67531

paragraphs 8.1.5.1(a)(i) and 8.1.5.1(a)(ii) above.

(iv)        survey control point information and the elevation of the top of some structures are subject to specific survey—therefore, these heights may be used without adding the map/chart vertical accuracy described in this sub-paragraph.

(b)         Forecast Altimeter Setting Error.

(i)            at aerodromes where a 24-hour ATC tower service is not provided, and a TAF is issued on a 24-hour basis (TAF Category 1 or 2 aerodrome), an allowance of 100 ft (3 hPA) must be added to the lowest OCA;

(ii)          for aerodromes where a TAF may not be available 24 hours per day, an allowance of 150 ft (5 hPA) must be added to the lowest OCA;

(iii)        the published MDA box will be shaded in both cases to permit a reduction of 100 ft to MDA if local QNH is available from an approved source.

(c)          Obstacles.

(i)            all known obstacles, including vegetation, must be accounted for. In addition, an allowance must be made for vegetation growth and the erection of new obstacles in the period between obstacle surveys. The allowance for these factors must be 100 ft over open country or water suitable only for leisure boating and 200 ft over tropical rain forest, open water, or built-up areas. In the event of known obstacles exceeding these values, the greater value must be used.

8.1.6                   Visibility

8.1.6.1              Definitions. In paragraphs 8.1.6.1A to 8.1.6.1D:

 APLL, in relation to a runway, means:

(a) the length of an ALS, for the runway, in metres; or

(b) if there is NALS in relation to the runway — zero metres.

 MDH means minimum descent height.

 straight-in approach procedure aligned with runway centreline means a straight-in approach procedure, for a runway, which:

(a) utilises precision approach (ILS or GLS), ILS localiser, GNSS, VOR, or NDB, guidance for the final approach segment, and

(b) for which the final approach track is offset by:

(i) for a Cat A or B aeroplane — not more than 10 degrees from the runway centreline; or

(ii) for a Cat C or D aeroplane — not more than 5 degrees from the runway centreline.

 TCH means threshold crossing height.

 VPA means vertical path angle, in degrees.

8.1.6.1A Application of procedures for determining minimum RVR, or visibility, for certain straight-in approach procedures. The procedures for determining minimum RVR, or visibility, under paragraphs 8.1.6.1B and 8.1.6.1C apply to any of the following straight-in approach procedures:

(a) a precision approach procedure with a DH of not less than 200 ft;

(b) an approach procedure with vertical guidance;

(c) a non-precision approach procedure;

 which meets the PANS-OPS Vol II, or ICAO Doc 9905, requirements for a straight-in approach procedure.

8.1.6.1B Method for determining minimum RVR or visibility