Document ID: chunk:federal_register_of_legislation:F2022C00813:reg:300:p21
Version: federal_register_of_legislation:F2022C00813
Segment Type: reg
Provision Reference: reg 300 (pt 21/27)
Character Range: 126015–128934

to the nearest 10 ft; and

(b)         visibilities must be rounded up to the nearest half kilometre.

8.6.11              Allowance for tidal rise and fall

 A TIFP must account for a tidal rise and fall of up to 50 ft by restricting helicopter descent in the visual segment of the approach to not less than 50 ft above the height of the landing deck.

8.6.12              Visibility

 The TIFP must require visibility which is the greater of the following:

(a)         the nominal distance from the MAPt to the ATP;

(b)         the distance required to decelerate from the maximum permitted TAS on final at ISA+15°C to the hover;

(c)          the distance as defined by the formula under paragraph 8.6.13.

       Note   The visibility data shown in Figures 8-25 and 8-26 are based on calculations inparagraph 8.6.13 for the indicated MDA and a G/S of 70 kt. Operators must adjust the calculations for actual conditions in accordance with paragraph (a), (b) or (c), whichever is the greater.

8.6.13              Determination of obstacle avoidance

 For paragraph 8.6.12.1 (c), the formula is in Appendix 3, Determination of obstacle avoidance, in this section.

       Note   To determine obstacle avoidance, calculations in accordance with the formula in Appendix 3 must be undertaken by the TIFP designer, as part of the process of determining the visibility required for the TIFP. Results from the formula are compared with the visibility requirements in paragraphs 8.6.12.1 (a) and (b) to arrive at the correct applicable visibility. (Figure 8-27 is illustrative only.)

8.6.14              Missed approach point (MAPt)

 For a TIFP, the minimum distance from a radar defined MAPt to the reference target is the airborne radar's near echo suppression range.

8.6.15              Administration

 CASA Head Office is responsible for issuing design authorisations in accordance with Part 173 of CASR 1998 and this MOS.

       Note   The relevant CASA Area Office will normally be the first point of contact and will advise, review and otherwise assist applicants' requests for approvals.
Appendix 1 Helicopter approach templates and supporting diagrams
Note   See paragraph 8.6.5.
Figure 8‑22: Plan – Final and Missed Approach – direct and overhead approaches
Figure 8‑23: Elevation — direct approach

Figure 8‑24: Plan and elevation — overhead approach

Figure 8‑25: Offshore facility — direct airborne radar approach

Figure 8‑26: Offshore facility — overhead airborne radar approach
Appendix 2 Calculation of a holding area/land overlap in direct approach procedures
The relocation distance for the VF is:

 VFA = ATP - VFI - HoldSL

         Where:

 VFA = relocation distance of the VF location (NM)

 ATP = the ATP track distance from land (NM)

 VFI = Initial VF distance from ATP (10 NM)

 HoldSL = simplified length of the holding pattern (9.1 NM).

         The VF is relocated towards the ATP by