Document ID: chunk:federal_register_of_legislation:F2024C01244:reg:5:p147
Version: federal_register_of_legislation:F2024C01244
Segment Type: reg
Provision Reference: reg 5 (pt 147/225)
Character Range: 692459–695159

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 number of lamps on outage within a light unit and also the number of light units within the PAPI.

       (1) A single-sided PAPI is deemed to be unserviceable if:

(a) subject to paragraph (c), any lamp in a 2 or 1 lamp light unit is unserviceable; or

(b) 2 or more lamps in a 3 or more lamp light unit is unserviceable; or

(c) for a red filter — 1 or more of the following has occurred, namely, that the filter:

 (i) has deteriorated to such a degree that it does not produce the correct colour light beam;

 (ii) is missing;

 (iii) is damaged.

       (2) For paragraph (1) (c):

(a) all the lamps associated with the red filter must be extinguished until the red filter is rectified; and

(b) the affected lamp or lamps must be considered to be unserviceable lamps when applying paragraph (1) (a) above.

       (3) A PAPI must be extinguished until the unserviceability in the system is rectified.

       (4) A double-sided PAPI with 8 light units is deemed to be unserviceable if all light units in one wing bar are fully functioning, and any light units in the other wing bar are unserviceable.

       (5) For subsection (4), the PAPI may remain in use if a NOTAM sets out:

(a) the number of unserviceable light units; and

(b) which side of the runway is affected.

       (6) A double-sided PAPI with 8 light units is deemed to be unserviceable if one or more light units in each wing bar is unserviceable.

       (7) An unserviceable double-sided PAPI must be extinguished until the unserviceability is rectified.

9.141 Interleaved circuitry

        A lighting system serviced by interleaved circuitry is deemed to be unserviceable if any 1 of the circuits fails.

9.142 Movement area guidance signs

        For a movement area guidance sign (MAGS):

(a) the sign must be legible at all times; and

(b) any lamp unserviceability in a sign must be fixed as soon as possible.

Note 1   No specific standard is specified for a critical number of unserviceable lamps in an illuminated MAGS. The key requirement is the legibility of the sign inscription at all times.

Note 2   The failure of MAGS illumination is not subject to notification by NOTAM.

9.143 Other lighting on the aerodrome

       (1) This section applies only to lights that are not otherwise provided as visual aids to aircraft under the other provisions of this MOS.

          (2) The following requirements must be complied with:

(a) an aerodrome operator