Document ID: chunk:federal_register_of_legislation:F2022C00813:reg:300:p24
Version: federal_register_of_legislation:F2022C00813
Segment Type: reg
Provision Reference: reg 300 (pt 24/27)
Character Range: 134487–137600

at that point. Its boundaries join at a tangent to a circle of 926 m radius centred on the HLS (see Figure 8-28).
Figure 8-28: Visual approach area — helicopter

8.8.5.2              Length. The nominal length of the VAA-H is 3 km. The actual length is determined by the distance from the MAWP to the centre of the HLS. In any event, it should be such as to allow visual reference to be maintained with the HLS or key lead-in points.

8.8.6                   Obstacle Clearance

8.8.6.1              A minimum obstacle clearance (MOC) of 90 m (295 ft) shall apply throughout the VAA-H. The principle of secondary areas does not apply.

8.8.7                   Missed Approach

8.8.7.1              In addition to the standard missed approach analysis, a missed approach analysis for the VAA-H is also required. When considering these missed approaches, the obstacle distance (doH) is measured via the shortest distance from the boundary of the VAA-H or missed approach turn initiation area boundary (see Figure 8-29).
Figure 8-29: Turning missed approach

8.8.7.2              Straight Missed Approach. The VAA-H sits within the protected area of the straight missed approach segment. Accordingly, no adjustments are required for the straight missed approach splay (see Figure 8-30).
Figure 8-30: Straight missed approach

8.8.7.3              Turning Missed Approach. Depending on the turn angle, the VAA-H can extend beyond the protected area of the turning missed approach segment (see Figure 8-29) In this event, the turning missed approach area is extended on the outside of the turn by drawing a straight line from the outside edge of the splay at the nominal MAHWP or MATWP at a tangent to the 926 m radius arc around the HLS. The MOC in this extended area is 40 m (130 ft).

8.8.8                   Calculation of MDA

8.8.8.1              The MDA for the procedure is the highest calculated OCA of the following the:

(a)         final approach;

(b)         VAA-H;

(c)          missed approach;

(d)         VAA-H missed approach.

Section 8.9:   Publishing

8.9.1                   Procedure to be published in accordance with data product specification

8.9.1.1              A certified designer must comply with the format and drafting conventions specified in a data product specification, given to the designer under regulation 175.160 of CASR 1998, for the publication of a procedure.

REVISION HISTORY

Note: The Revision History shows the most recent amendment first. Scroll down the table to view details of previous amendment information.

Version  Date           Chapter/ Section/Paragraph  Details
1.1      May 2004       Chapter 8                   Inserted new section 8.1.12.4 Location of missed approach point.
                        Cover page                  Cover page and verso changed to introduce J.S. McMillan as the source of supply for the manual and to reflect version change.
                        All                         Introduced new CASA logo.
1.0      February 2003  All                         First issue of MOS Part 173

NOTES TO MANUAL OF STANDARDS PART