[SystemSafety] Chicago controller halts Delta jet's near-miss....

[Bernd Sieker]

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On 29.06.2015 09:15, Klaus wrote:
> Dear all,
> 

Thank you for the long explanations.


> Then, ICAO manual 9432 specifies: 2.7.2.3 An aircraft shall not
> change its type of call sign during flight except when there is a
> likelihood that confusion may occur because of similar call signs;
> in such cases, an aircraft may be instructed by an air traffic 
> control unit to change the type of its call sign temporarily.


Note that it does not say "change the callsign", but "change the
*type* of callsign". Types are (a) registration, (b) operator +
registration and (c) operator + flight number.

Since (c) is the norm for scheduled line flights, it could then be
instructed to use type (a) or (b) instead.


> Best, Klaus Sievers
> 


Bernd
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