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(...) -when the radar controllers are not physically adjacent, two-way direct-speech facilities between them are at all times available which permit communications to be established instantaneously. Note.-”Instantaneous” refers to communications which effectively provide for immediate access between controllers.
(...) -radio communication with the aircraft is retained by the transferring radar controller until the accepting controller has agreed to assume responsibility for providing the radar services to the aircraft (...)
Where SSR is being used and controllers are provided with radar displays showing the radar position indication and, in alphanumeric form, the identification and level of the aircraft, transfer of radar control of aircraft between adjacent control positions or between two adjacent ATC units may be effected, provided that (...)
a)-updated flight plan information on the aircraft about to be transferred, including the discrete assigned SSR Code, is provided to the accepting controller prior to the transfer;
b)-radar coverage provided to the accepting radar controller is such that the aircraft concerned is shown on the radar display before the transfer is effected and is identified on, but preferably before, receipt of the initial call;
c)-when controllers are not physically adjacent, two-way direct speech facilities, which permit communications to be established instantaneously, are available between them t all times;
d)-the transfer point or points and all other conditions of application (...) have been made the subject of specific instructions (for intra-centre transfer) or of a specific letter of agreement between two adjacent ATC units;
(...)
A.3.2 ICAO Doc.7030, EUR SUPPS :
(...) 6.2 Transfer of radar control without verbal exchange - “silent” radar transfer
Transfer of radar control based on the procedures specified in ICAO Doc 4444 Part VI may be carried out without systematic use of the bi-directional speech facilities available between the adjacent units concerned, provided that :
1) -the detailed conditions applicable for the transfer are the subject of a bilateral agreement; and
2) -the minimum distance between successive aircraft during the period of transfer is agreed as one of the following values :
a)-10 NM when SSR information is used in accordance with the
provisions of 7.2.1. 3), provided that an overlapping radar coverage of at
least 30 NM between units involved exists; or
b)-5 NM when the conditions of a) above apply and both units involved posses electronic aids for immediate recognition of release and acceptance of aircraft under radar transfer.(...)
(...) SSR-derived information may be used alone for the provision of horizontal separation between aircraft in the circumstance and under the conditions specified below :
1)- (...) SSR response may be used for the separation of transponder equipped aircraft (...)
2)- (...) a)-reliable SSR coverage exists within the area;
b)-the area is designated as controlled airspace
c)-the control of air traffic is vested in one ATC unit unless adequate means of co-ordination exist between all ATC units concerned;
d)-actual operating experience has shown that loss of SSR responses is not occurring at a rate affecting the safety of operations and adequate measures for earliest possible detection of such losses have been developed;
e)-density and/or complexity of air traffic in the area and provision of navigational guidance allow to revert safely to other forms of separation in case of SSR failure;
f)-the aircraft concerned have previously been identified and identification has been maintained;
(...)
3)- In defined areas where advanced ATS systems are in operation and SSR is the main source for the provision to air traffic serves of continuous information on the position of the aircraft, and where the carriage of transponders is mandatory, the appropriate ATS authority, after consultation
　
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