Document ID: chunk:federal_register_of_legislation:F2024C01244:reg:5:p67
Version: federal_register_of_legislation:F2024C01244
Segment Type: reg
Provision Reference: reg 5 (pt 67/225)
Character Range: 488289–491023

day — illuminance above 500 lux;
            (b) twilight — illuminance between 50 and 500 lux;
            (c) night — illuminance below 50 lux.

 (ii) a switching system that will ensure the correct intensity setting between day, twilight and night.

    (3) If, because of local conditions, an aerodrome requires the aerodrome lights to be set at a higher intensity than night intensity, then a twilight intensity setting may be used, provided it does not produce glare hazard to pilots.

       (4) The PAL must activate an aerodrome lighting system if it detects a coded carrier frequency signal from an airband VHF transmitter (a coded signal).

       (5) On receipt of the coded signal:

(a) the PAL control unit must go into the operate mode for a pre-set period; and

(b) the lights must remain on:

           (i) for a period of at least 30 minutes; or

           (ii) for a period longer than 30 minutes — if local aerodrome operating conditions require the lights to remain on for a longer period in the interests of aviation safety.

       (6) Ten minutes before the aerodrome lighting system is due to turn off, the PAL must cause the lights of at least the primary illuminated wind direction indicator (pIWDI) to flash, and continue to flash, at between 40-50 cycles per minute until either:

(a) the PAL switches off, and all aerodrome lighting, including the pIWDI lights, is extinguished; or

(b) the PAL has been reset for another "on" period.

       (7) When in operate mode (including the last 10 minutes), the receipt of another transmitted activation code must reset the PAL to the beginning of the pre-set period.

9.20 VHF carrier activation code

       (1) The code required to activate the PAL must be generated when the press-to-talk switch of the aircraft VHF transmitter is depressed and a radio frequency carrier signal is produced.

       (2) The activation code must consist of 3 bursts of carrier signal, each between 1 and 5 seconds long, with the last 2 code bursts completed within 24 seconds of the end of the first burst.

       (3) The PAL detector must be capable of tolerating a gap of 0.1 seconds between code bursts.

Note   This is the minimum time it takes to depress and release the aircraft press-to-talk switch. CASA recommends that the code pilots should send is 3 bursts of approximately 3 seconds each, with at least 1 second between bursts, and the 3 bursts must be transmitted within a total of 25 seconds from first to last.

9.21 VHF carrier receiver technical requirements

       (1) The VHF carrier receiver (the receiver) must accept a carrier signal over the frequency range of 118 MHz to 136 MHz.

       (2) The receiver must be controlled at a single frequency