Document ID: chunk:federal_register_of_legislation:F2024C01244:reg:5:p146
Version: federal_register_of_legislation:F2024C01244
Segment Type: reg
Provision Reference: reg 5 (pt 146/225)
Character Range: 689885–692710

shown in Table 9.116 (3); or

(b) the average horizontal illuminance exceeds the maximum uniformity ratio (average to minimum) of not more than 8:1; or

(c) the average vertical illuminance falls below 50% of the associated minimum lux rating in accordance with Table 9.116 (3), as applicable; or

(d) in low-visibility conditions:

 (i) 2 or more adjacent aircraft parking position manoeuvring guidance lights are unserviceable; and

 (ii) there is inadequate illumination available from the apron floodlighting; or

(e) the average illuminance in paragraph 9.116 (3) (a) is not restored within 60 seconds in the event of a power failure to the associated apron floodlighting.

       (2) An apron lighting system is deemed to be unserviceable if:

(a) illumination of the apron outside the parking position falls below the minimum intensity specified in paragraph 9.116 (3) (c) (but subject to subsection 9.116 (4)); or

(b) in low-visibility conditions, the taxiway centreline lights, or the apron floodlighting system, does not provide illumination for the taxiway markings.

Note   For apron floodlighting, the unserviceability standards take into account the reduction in illuminance on the apron edge taxiway, apron taxilane and aircraft parking position, or the presence of shadows, due to a lighting failure.

9.139 T-VASIS standards for unserviceability

       (1) A T-VASIS light unit is deemed unserviceable if:

(a) 3 or more lamps in the electrical (day) circuit are unserviceable; or

(b) any of the lamps in the electrical (night) circuit is unserviceable.

       (2) A T-VASIS is deemed unserviceable if:

(a) for bar units ― 3 or more light units, or 2 or more adjacent light units, are unserviceable;

(b) for fly-up units ― 2 or more light units are unserviceable;

(c) for fly-down units ― 1 or more light units are unserviceable.

        Note   For a T-VASIS, the outage standards take into account both the number of outage lamps within a light unit, and also the number of light units within the T-VASIS.

       (3) An AT-VASIS is deemed unserviceable if:

(a) for bar units ― 2 or more light units are unserviceable; or

(b) subject to paragraph (d), for fly-up units ― any light unit is unserviceable; or

(c) subject to paragraph (d), for fly-down units ― any light unit is unserviceable; or

(d) a red filter has deteriorated such that it does not produce the correct colour light beam, is missing, or is damaged.

       (4) For paragraph (3) (d):

(a) all the lamps within the affected light unit must be extinguished until the red filter is rectified; and

(b) the affected light unit must be considered to be an unserviceable light unit for paragraph (3) (b) or (3) (c).

9.140 PAPI unserviceability standards

Note   For a PAPI, the unserviceability standards take into account both the