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7.2 Radio Failure Procedure
7.2.1 When an aircraft is being radar vectored the interval between radio
transmission is short. Pilots should make a radio check if no transmission
is heard after a reasonable interval.
7.2.2 In the event of failure of two-way communications while operating
on the radar frequency, the pilot must change to the alternative frequency
and request instructions.
7.2.3 If unable to make contact on the alternative frequency, the pilot
must comply with standard radio failure procedures.
7.2.4 If able to receive but not transmit, the pilot must remain on the
radar frequency and comply with instructions issued which are designed
to establish that the aircraft is receiving. If this is established,
further instructions will be issued.
7.3 Radar Failure Procedure
In the event of radar failure, or loss of radar contact, appropriate
instructions will be issued.
7.4 SSR Emergency Codes
7.4.1 The pilot in an emergency situation must select code 7700 unless
there is a specific reason not to do so.
7.4.2 A pilot must set the transponder on the appropriate code when
subject to unlawful interference. On receipt of this code the controller
will:
a. request confirmation of the setting of the assigned code as follows:
“CONFIRM SQUAWKING ASSIGNED CODE”. (The absence
of a reply in these circumstances shall be regarded as
positive evidence of the emergency);
b. provide the aircraft with priority in all respects;
c. transmit all useful information pertinent to the conduct of the
flight without expecting a reply from the aircraft;
d. avoid references to the nature of the emergency except if it is
first referred to by the pilot;
e. monitor and plot the progress of the flight;
GEN TOC ENR TOC AD TOC Index
ENR (EN ROUTE) A/L 45 effective 24 NOV 05
f. coordinate transfer of control, as appropriate, without requiring
responses from the aircraft, unless communication remains
normal; and
g. relay messages as required between the aircraft and appropriate
authorities.
7.4.3 The pilot of an aircraft losing two-way communication must set the
transponder to code 7600.
7.4.4 A radar controller observing a 7600 code shall request the pilot to
operate the identification (SPI) function. If the identification signal
is received, further control of the aircraft will be continued using the
identification transmission to acknowledge receipt of instructions
issued.
7.4.5 If the identification signal is not received, the aircraft must continue
with the transponder on code 7600 and follow radio failure procedures.
GEN TOC ENR TOC AD TOC Index
ENR (EN ROUTE) A/L 45 effective 24 NOV 05
8. AIRCRAFT RADAR BEACON TRANSPONDER
8.1 Operation of Transponders
8.1.1 Except as indicated below, ATS will assign a temporary discrete
code for each flight sector for aircraft operating in controlled airspace,
and for aircraft participating in Radar Information Service
(RIS).
8.1.2 Unless advised otherwise by ATC or in accordance with para
8.1.8, pilots of Mode 3A transponder-equipped aircraft operating
in Australian airspace must activate their transponders, and where
a Mode 3C capability is also available it must be activated simultaneously
with Mode 3A.
Note: Pilots must ensure that transponders are activated and the
altitude function is selected as:
a. primary radar coverage only exists within 50NM of major airports
and the remainder of the radar surveillance system relies
on transponder information, and
b. TCAS relies on transponder information for its pilot alerting and
collision avoidance functions.
8.1.3 When operating in Australian airspace, or on reaching the
Australian FIR boundary if inbound to Australia, pilots of Mode 3A
transponder-equipped aircraft must ensure that the assigned temporary
discrete code for that flight sector, or the appropriate nondiscrete
code from the following listing is selected:
a. Civil flights in classes A, C and D airspace, or IFR
flights in Class E airspace 3000
b. Civil IFR flights in Class G airspace 2000
c. Civil VFR flights in classes E or G airspace 1200
d. Military flights in classes A, C, D or E airspace 5000
e. Military flights in Class G airspace 6000
f. Civil flights not involved in special operations or
SAR, operating in Class G airspace in excess of
15NM offshore 4000
g. Civil flights engaged in littoral surveillance 7615
8.1.4 Pilots of flights which will require a RIS and/or a clearance into controlled
airspace, and for which a discrete code has already been
coordinated, must select that code immediately prior to making
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