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Old 26th Mar 2007, 12:56
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This is a crisis
 
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Sometimes the IDENT feature is used as an alternative for matching code callsign conversion pairing.
e.g. An Aerodrome launches an aircraft and identifies the primary return within one mile of the end of the runway. The Mode A is then associated with this return and so becomes validated.
The next unit along the line can then use this validated return (subject to local agreements) but if code callsign conversion is in use, they have to confirm the pairing before the return can be considered identified to them. This quite often involves messing around with toggling codes and callsigns. It is therefore usually much quicker just to get the aircraft to squawk IDENT.
Mats Part 1:
Identification:
b) Recognising a validated four digit code previously assigned to an aircraft callsign.
When code/callsign conversion procedures are in use, and the code/callsign pairing
can be confirmed, the callsign displayed in the data block may be used to establish
and maintain identity;
c) Observing an IDENT feature when it has been requested. Caution must be
exercised when employing this method because simultaneous requests for SPI
transmissions within the same area may result in misidentification. Aircraft
displaying the conspicuity code are not to be identified by this method.
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