Document ID: chunk:federal_register_of_legislation:F2024C01244:reg:5:p99
Version: federal_register_of_legislation:F2024C01244
Segment Type: reg
Provision Reference: reg 5 (pt 99/225)
Character Range: 567914–572163

and

 (ii) adherence to the standard wheel clearance would cause a loss of landing distance; and

 (iii) there are no objects or structures under the approach near the threshold, for example, approach light supporting structures, boundary fences or roads; and

 (iv) a safety assessment demonstrates that the reduced clearance does not have an adverse effect on aviation safety; and

 (v) CASA, in writing, approves.

Note   The standard wheel clearance may be increased if a greater crossing height is considered a safer option compared with a touchdown point further down the runway (subject to adequate landing distance being available for the most demanding aircraft).

     Table 9.50 (4)   Wheel clearance over threshold for PAPI

Pilot-eye-level-to-wheel height of aeroplane in the approach configurationa                                                                                                                                                                                                        Standard wheel clearance  Minimum wheel clearance
                                                                                                                                                                                                                                                                                   (metres)b                 (metres)c, d
Up to but not including 3 m                                                                                                                                                                                                                                                        6                         3
3 m up to but not including 5 m                                                                                                                                                                                                                                                    9                         4
5 m up to but not including 8 m                                                                                                                                                                                                                                                    9                         5
8 m up to but not including 14 m                                                                                                                                                                                                                                                   9                         6
The superscript letters in the Table, have the following effect.
a In selecting the pilot-eye-to-wheel height group, only aeroplanes meant to use the system on a regular basis are to be considered. The most demanding of such aeroplanes must determine the pilot-eye-to-wheel height group.
b If possible, the standard wheel clearance shown in column 2 must be provided.
c The wheel clearance may be reduced to not less than those in column 3 with specific written agreement of CASA, where an aeronautical study indicates that such reduced wheel clearances are acceptable.
d If the minimum wheel clearance is provided at a displaced threshold, the corresponding standard wheel clearance specified in column (2) must be available when an aeroplane at the top end of the pilot-eye-to-wheel height group chosen overflies the extremity of the runway.

       (5) The location of the PAPI light units is determined by the relationship between:

(a) the approach angle; and

(b) the difference in levels between the threshold and the light units; and

(c) the minimum eye height over the threshold (MEHT), being dependent on the angle M as shown in Figure 9.50 (5) that is 2' of arc less than the setting angle of the unit which defines the lower boundary of the on-slope indication (unit B, the third unit from the runway as shown in Figure 9.50 (5)).

       (6) If a PAPI is installed on a runway that is not equipped with an ILS, the distance between the threshold and the PAPI (D1, shown in Figure 9.50 (5)) must ensure that the lowest height at which a pilot will see a correct approach path indication will provide the wheel clearance over the threshold specified