Should RAs be ignored during closely spaced parallel approaches?
TCAS II should be operated in the TA/RA mode at all times. An aircraft operating in the TA-only mode is denied the benefit of collision avoidance. When TCAS TA/RA mode is selected, then the crew should follow an RA generated. Not to do so would not only deny own aircraft the safety benefit provided by the RA, but would also compromise the effectiveness of a coordinated RA generated on the other aircraft. Even if closely-spaced parallel approaches procedures are correctly applied ‘nuisance’ RAs may occasionally occur. However, the safety benefit provided by ACAS takes precedence over an occasional ‘nuisance’ RA. Additionally, there is always a possibility that another aircraft will penetrate the approach airspace causing a real threat.
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