What is the guidance for ACAS operations during closely spaced parallel approach? Should RAs be ignored during closely spaced parallel approaches?
ACAS 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 ACAS TA/RA mode is selected, then the crew should follow an RA generated. Not to do so not only would 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 and subsequent go-around. Additionally, there is always a possibility that another aircraft will penetrate the approach airspace causing a real threat. Note that the evaluation whether the RA was ‘nuisance’ can be done only in hindsight. In real-time the pilot has little chance to correctly evaluate the threat. For more information about TA-only operations see the question below.
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