Document ID: chunk:federal_register_of_legislation:F2024C01244:reg:5:p207
Version: federal_register_of_legislation:F2024C01244
Segment Type: reg
Provision Reference: reg 5 (pt 207/225)
Character Range: 853094–856125

(7) The AFRU must have a minimum capacity of 8 seconds for the recorded voice message.

       (8) The AFRU audio transmissions must be clear and intelligible.

       (9) The length of carrier transmission must not exceed the AFRU recorded voice message time.

Note   The carrier must not continue after the voice modulation ceases.

       (10) The transmitted recorded voice message or the tone burst of the AFRU must commence less than 500 milliseconds after the end of the aircraft transmission.

       (11) The transmitter beepback tone of the AFRU must be a 1 000 Hz, 300 millisecond tone burst.

       (12) If the primary power supply for the AFRU fails, the power source must automatically change over to a stand-by power supply capable of operating the unit without interruption for 24 hours.

Note   CASA recommends that, unless the expected aircraft traffic and resultant transmission volume at an aerodrome are known, the transceiver should be able to facilitate, at a minimum, 2 voice responses per hour during the 24 hour period.

       (13) In the event of an internal fault that results in continuous or jammed transmission of the VHF carrier, the AFRU must:

(a) internally detect the continuous or jammed transmission within 1 minute; and

(b) shut down or recycle the unit.

22.05 Power supply and changeover indications

        Either of the following:

(a) the external housing of the AFRU;

(b) remote monitoring of the AFRU;

        must provide an indication of:

(c) the presence or failure of the primary power supply; and

(d) whether a changeover has occurred to operation on the stand-by supply.

22.06 UNICOM services

       (1) UNICOM (universal communications) services:

(a) are non-ATS radio communication services provided on an aerodrome CTAF to enhance the value of information normally available about a non-controlled aerodrome; and

(b) being a secondary use of CTAF, must not inhibit the exchange of aircraft-to-aircraft traffic information.

Note   The primary function of the CTAF frequencies used by UNICOM services is to enable pilots to exchange traffic information for aircraft separation purposes.

       (2) A UNICOM service is not a CA/GRS.

       (3) An aerodrome operator's use of UNICOM services, whether as a frequency confirmation system or otherwise, must be limited to the exchange of radio messages concerning the following:

(a) confirmation of the CTAF frequency selected by aircraft;

(b) general aerodrome weather reports;

(c) aerodrome information;

(d) estimated times of arrival and departure;

(e) passenger requirements;

(f) aircraft refuelling arrangements;

(g) maintenance and servicing of aircraft, including the ordering of urgently required parts;

(h) unscheduled landings by aircraft.

       (4) General aerodrome weather reports provided by a UNICOM operator must be limited to simple, factual statements about the weather, unless the operator is authorised by CASA to make meteorological observations.

CHAPTER 23 LOW-VISIBILITY OPERATIONS