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The pilots hear the RA aural alert “DESCEND, DESCEND NOW”. Seconds after, a second RA aural alert sounds “CLIMB, CLIMB NOW”. What should the pilots do?

  • A

    Ignore RA, it’s clearly U/S.

  • B

    Stay level because both RAs cancel each other out.

  • C

    Try to make visual contact and then perform RA.

  • D
    Follow RA and bear in mind flight path deviation.

Resolution Advisory (RA)

The PF must respond immediately to RA. The manoeuvre must be limited to the minimum required to satisfy the RA. The PF must strictly follow the TCAS RA even if:

  • Conflicting instructions have been issued by ATC.

  • The RA response capability is limited by aircraft performance.

  • A Traffic information has been given by ATC.

  • There is a visual contact to other traffic. Pilots must be aware that an aeroplane sighted may not necessarily be the intruder or the sole intruder TCAS is responding to.

The PM shall monitor the response to the RA and shall provide updates on the traffic location by checking the traffic display.

When a RA occurs, the Flight Crew must notify the appropriate ATC unit as soon as possible, as permitted by Flight Crew workload.

Pilots should maintain situational awareness since TCAS may issue RAs in conflict with terrain considerations, such as during approaches into rising terrain. Continue to follow the planned lateral flight path unless visual contact with the conflicting traffic requires other action.

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