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Insure that the XPDR altitude reporting is accurate. Inaccurate altitude reporting may lead to unnecessary RA with potential domino effect in RVSM airspaces.

4 Except for A380 ND where a white indication TCAS STBY is displayed when TRAF is selected on EFIS.

3.2.2. FOR THE FLIGHT CREW

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React immediately and appropriately. The RA order must be applied without delay and the green sector of the vertical speed scale must not be exceeded. Do not overreact.

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Do not change the flight path on TA alert. TA is not a dangerous collision threat. However, pay attention when a TA is triggered.

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ADJUST VERTICAL SPEED = Reduce vertical speed. Do not invert the maneuver.

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Take care of VFR traffic whose transponder may not transmit the barometric altitude. Indeed, Mode C at least is required to trigger RA.

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Do not use the TCAS to maintain separations with other aircraft. The ATC controller is responsible for the separation of aircraft. In addition, the TCAS does not provide enough information as SSR does to insure a safe separation.

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Report RA to ATC as soon as possible. This might be the only way to inform the ATC controller of an RA. It will prevent the ATC controller issuing conflicting instructions.

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Always report to ATC when clear of conflict as soon as possible. This might be the only way the ATC controller has to resume normal operations.

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Resume initial ATC clearance when clear of conflict.

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Limit vertical speed to 1 500 ft/min during the last 2 000 ft of the climb or descent. It will prevent level busts that could lead to conflict with aircraft above or below the cleared flight level, especially in RVSM airspaces.

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Check that TCAS is active while approaching a runway for take-off. An active TCAS at that time enables to check there is no landing traffic before lining up on the runway and to prevent omissions of TCAS activation for take-off.

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Refer to ICAO Doc 9863 – Airborne Collision Avoidance System (ACAS) Manual and Part III, Section 3, Chapter 3 of Aircraft Operations – Flight Procedures, Doc 8168-OPS/611, Volume I for operational guidelines (see References).

3.3. REGULATIONS FOR TCAS

The carriage of ACAS II as per ICAO Annex 10, Volume IV is mandatory in all
ICAO member States as per ICAO Annex 6 – Operations of Aircraft – Part I:

“6.18.1 From 1 January 2003, all turbine-engined aeroplanes of a maximum certificated take-off mass in excess of 15 000 kg or authorized to carry more than 30 passengers shall be equipped with an airborne collision avoidance system (ACAS II).
6.18.4 An airborne collision avoidance system shall operate in accordance with the relevant provisions of Annex 10, Volume IV.”
As per EASA EU OPS 1.668, ACAS II is mandatory.
　
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