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<strong>Annual</strong> <strong>Report</strong> and Accounts <strong>2015</strong> | <strong>NATS</strong> Holdings Limited<br />

Governance<br />

74<br />

<strong>Report</strong>s from Board Committees<br />

(continued)<br />

implied by this programme is for aircraft to be sequenced<br />

into an arrival stream which eliminates, as far as possible,<br />

the need for holding before commencing an approach. It<br />

represents a major change in concept for controllers, and<br />

hence carries implementation risk. Any changes to flight<br />

path patterns requires public consultation, and although<br />

this programme will bring major benefits to the airlines, the<br />

communities under the flight paths, and the environment; all<br />

such changes require conscientious effort to gain informed<br />

support from all parties.<br />

c. New controller workstation and other projects<br />

The new generation of workstations will provide much of the<br />

additional functionality in support of the core system.<br />

Transition Altitude<br />

This is the point at which all aircraft change from standard<br />

pressure setting (at altitude) to sea level pressure (for local<br />

terrain clearance). A proposed alignment from various<br />

altitudes to a revised universal Transition Altitude at<br />

18,000ft across Europe is in discussion, and is likely to be<br />

implemented in any case in UK airspace. It will necessarily<br />

carry risks during transition.<br />

Transition Operations Room<br />

As part of the fundamental change in operating<br />

methodology a transitional operations room has been<br />

created. This will be redundant when the full migration to<br />

new operating methods under SESAR is complete. It is in<br />

build at the year end and the Committee will closely monitor<br />

the programme for implementation.<br />

Resilience<br />

Resilience of operational systems results from a<br />

combination of reliability and powers of recovery. Over<br />

many years <strong>NATS</strong> has been successful in implementing<br />

highly resilient systems, necessary to the fulfilment of its<br />

mission. The Committee is considering the subject in more<br />

depth as a result of a small number of significant recent<br />

events. The objective is to balance the levels of investment<br />

against realistic expectations of resilience in a complex<br />

systems environment.<br />

Peter Read<br />

Chairman of the Technical Review Committee<br />

Time Based Separation<br />

This concept changes the method of separation of aircraft<br />

on the approach to major airports from a distance base<br />

to a time base. It has been successfully implemented at<br />

Heathrow to good effect, thereby significantly reducing<br />

disruption and delays caused by strong weather conditions.<br />

Governance

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