Nuggett 90
Pilots of UK-registered aeroplanes equipped with TCAS II were required to be trained in accordance with the contents of Civil Air Publication (CAP) 579, published that month, which included the following text:
"Manoeuvres should never be made in a direction opposite to that given in an RA: this is because the sense may have been determined following an exchange of data with the established threat. For this reason:
(a) RAs may be disregarded only when pilots visually identify the potentially conflicting traffic and decide that no deviation from the current flight path is needed.
(b) If pilots receive simultaneously an instruction to manoeuvre from ATC and an RA, and both conflict, the advice given by ACAS (TCAS) should be followed."
The JAA have published similar guidelines in Temporary Guidance Leaflet No 11.
To quote the JAA definitions:
Will means that the application of the rule procedure or provision is mandatory.
Should means that the application of the procedure or provision is recommended.
It seems to me that the JAA needs to revisit its TCAS recommendations.