Originally Posted by
Zar_1
Considering how crowded our skies are today, I've always felt strongly that systems like TCAS (and preferably also GPWS/EGPWS) must always be operative.
If I was getting TCAS RAs everyday I might agree with you, but the only RAs I’ve ever had were “nuisance” alerts where one aircraft was levelling off 1000’ above or below another. There’s also the point that, unlike doing the Tango, it only takes one to TCAS RA, so provided the MEL alleviation is short enough that the chances of coming across another aircraft operating under the same MEL are low enough, I’m comfortable with it as it is.