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The fral project
Free Route Airspace Lisboa FIR
The beginning of a new era…
Background
After nearly 30 years of international coordination
and development, the introduction
of basic area navigation (B-RNAV)
on 23 April 1998 marked the achievement
of one of the most significant and
challenging initiatives to improve the
efficiency of the air traffic services (ATS)
route network of the entire European Civil
Aviation Conference (ECAC) area.
However, the advantages expected from
RNAV, with the design and implementation
of the new ATS route network relying
on a complete RNAV environment in the
ECAC en-route airspace, have yet to be
accomplished. This is due to the fact
that European airspace is still confined
to a fixed ground-based navaid structure
resulting in a fixed ATS route network.
The significant traffic growth experienced
during the last decade, coupled with the
large increase in the en-route delay, forced
air navigation service providers (ANSPs)
to increase their airspace capacity by
restructuring the airspace with the creation
of smaller sectors. This trade-off between
operational management and flight efficiency
has resulted in the current airspace
sector design, which does not facilitate
the point-to-point alignment of the ATS
route network.
Airspace initiatives
As a result, the ATS route network is
still not capable of managing the potential
airspace capacity and of satisfying
aircraft operators’ expectations in terms
of greater operational flexibility, punctuality
and financial benefits.
In a bid to address this situation, IATA,
CANSO and EUROCONTROL have
recently launched the Flight Efficiency
Plan (FEP), which aims to enhance
European airspace design and network
management. The FEP comes at a
crucial time, when a global economic
crisis is seriously affecting airlines and
other stakeholders.
Due recognition should be given to the
EUROCONTROL Agency, which since
1994 has been coordinating the necessary
planning and implementation activities
to improve the European ATS route
network. It has done so on a dedicated
step-by-step basis through the Route
Network Development Sub-Group
(RNDSG). The year 2008 saw a significant
step forward, with some States
presenting several promising initiatives
regarding free-route-like operations, as
a starting point towards a full free route
airspace concept.
The FRAL project
Free route airspace is a specific airspace
within which users can freely plan their
routes between an entry point and an exit
point, without reference to the ATS route
network. In this airspace, flights remain
subject to air traffic control.
Recognising the challenges which lie
ahead in terms of traffic growth and flight
efficiency, NAV Portugal has welcomed
the FEP initiative and has decided to
implement, on 7 May 2009, a full free
route airspace within the Lisbon FIR
above FL245. This development is part
of a project known as FRAL (Free Route
Airspace Lisboa FIR).
Since the introduction of B-RNAV, the
Lisbon FIR has experienced a traffic
growth of approximately 52%. To address
this challenge, the NAV Portugal Airspace
Department has redesigned the en-route
airspace, thereby delivering a 60%
increase in capacity and a reduction in the
ATFM en-route delay of 0.2 minutes per
flight. The redesign of the airspace within
Lisbon FIR has taken into consideration
the main traffic flows and has optimised
the management of the operations room.
Consequently and independently of
the routes inserted in flight plans, it has
become common practice at the Lisbon
Area Control Centre to offer aircraft operators
the shortest route between an entry
and an exit point without penalising the
operational management (ATFCM) of the
en-route sectorisation. The day-to-day
experience gained in the operations room
has demonstrated the potential of the
Lisbon FIR to eliminate the upper ATS
Free route airspace is a
specific airspace within
which users can freely plan
their routes between an entry
point and an exit point.
Skyway 51 - Spring 2009 27
route network and carry out the three
main action points of the Flight Efficiency
Plan (see table).
With the elimination of the route network
above FL245, all that remain will be
waypoints/navaids, en-route sectors
and segregated airspace. The excellent
cooperation between NAV Portugal
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本文链接地址：
Skyway Magazine Spring 2009(19)
