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When considering system changes it is necessary to assess their impact on the entire ATC operational environment, and to endorse that the introduction of such changes into one air traffic system does not adversely affect, not only that system, but also any interfacing systems where changes have not been introduced.

IFATCA Policy is:

The reduction of vertical separation above FL 290 should not be implemented in any Region until the necessary procedures, staff and equipment are available to safely and expeditiously handle aircraft in the airspace experiencing the reduction and also in systems responsible for transition areas to airspace not affected by a reduction.

Only aircraft capable of meeting the Minimum Aircraft Systems Performance Specifications (MASPs) upon which reduced separation is dependent be permitted to operate in areas where reduced vertical separation is in effect.

Exceptionally, State aircraft may be accepted when appropriate procedures have been evaluated and validated, and controllers are trained in the operation of a mixed-traffic environment. If non MASPS (e.g. military) State aircraft are required to operate in RVSM airspace then, in order to preserve system safety, their number should be kept to the absolute minimum.

IFATCA is opposed to any derogation, mitigation or exemptions such as non-RVSM equipped State aircraft and aircraft not meeting ACAS II (TCAS version 7.0) requirement except in coordinated contingency emergency situations.

See: WP 50 – Acapulco 1990, WP 115 – Tunis 1996, WP 83 – Toulouse 1998 and WP 102 – Geneva 2001

See also: WP 102 – Christchurch 1993

IFATCA Policy is:

Failing a clear operational advantage for either the single alternate or the double alternate Flight Level Orientation Scheme (FLOS), IFATCA proposes that RVSM trials utilise the single alternate FLOS in order to achieve the global application in accordance with ICAO Annex 2. In order to validate the results during this trial period, enhancements on a sub-regional level may become necessary through adequate Flight Level Allocation Schemes (FLAS).

IFATCA urges all states concerned to ensure that the appropriate infra-structure will be in place prior to the commencement of these trials, this involves staff, equipment, training, airspace and route structure, including the transition areas. All factors must be verified and validated through simulations prior to implementation.

See: WP 83 – Toulouse 1998

IFATCA Policy is:

IFATCA endorses the investigation of the concept regarding the use of lateral offset in Oceanic RVSM airspace.

See: WP 107 – Toulouse 1998

See also: WP 88 – Geneva 2001


Last Update: September 29, 2020  

November 3, 2019   361   Jean-Francois Lepage    SEP    

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