Document ID: chunk:federal_register_of_legislation:F2024C01244:reg:5:p90
Version: federal_register_of_legislation:F2024C01244
Segment Type: reg
Provision Reference: reg 5 (pt 90/225)
Character Range: 545995–548751

lights must be toed-in 2 degrees.

CHAPTER 9

Division 9 Visual approach slope indicator systems

9.44 Visual approach slope indicator systems (VASISs)

       (1) This Division applies to the following types of VASIS:

(a) a T visual approach slope indicator system (T-VASIS);

(b) an abbreviated T visual approach slope indicator system (AT-VASIS);

(c) a precision approach path indicator system (PAPI);

(d) a double-sided PAPI.

       (2) The following VASIS must be installed:

(a) at an aerodrome with scheduled international air transport operations — a T-VASIS or a double-sided PAPI;

(b) at an aerodrome without scheduled international air transport operations — an AT‑VASIS or a PAPI, unless CASA has determined, in writing, that additional roll guidance is required;

(c) at an aerodrome where CASA has determined that additional roll guidance is required under paragraph (b) — a T-VASIS or a double-sided PAPI;

(d) if CASA determines, in writing, that high system integrity is required at an aerodrome — a T-VASIS or a double-sided PAPI.

       (3) If an existing taxiway or physical obstruction makes it impossible to install a T-VASIS or a double-sided PAPI on both sides of the runway, an AT-VASIS or a single-sided PAPI must be installed at the applicable runway threshold.

       (4) If an existing taxiway or physical obstruction makes it impossible to install a T-VASIS or a double-sided PAPI on the left-hand side of the runway to achieve the required threshold clearance based on the nominated approach slope, an AT-VASIS or a single-sided PAPI must be installed on the right-hand side at the applicable runway threshold.

       (5) An AT-VASIS or PAPI must be installed on the left-hand side of the runway (as viewed by a pilot approaching to land on the runway) unless it is physically impossible to so locate it, in which case the location may be on the right-hand side of the runway.

       (6) If more than one type of VASIS is used at an aerodrome, the same type of VASIS must be used at each threshold of a runway to avoid confusion.

       (7) If there is more than one runway, the same type of VASIS must be used on all runways with the same runway code number.

       (8) Subsection (6) does not apply if a VASIS type is provided for temporary use only.

9.45 Obstacle assessment surfaces

       (1) For each threshold of a runway where a VASIS is provided, an obstacle assessment surface (OAS) must:

(a) be identified from an obstacle survey and assessment; and

(b) meet the following standards as illustrated in Figure 9.45 (1):

 (i) the baseline must be 150 m wide and coincident with the existing baseline for the approach surface;

 (ii) the slope must be 1.9º;

 (iii) the splay must be 7.5º outwards,