CHRISTMAS OFFER Subscribe to Pilot Magazine today CLICK HERE

Mode S — what's going to happen

PUBLISHED: 17:10 22 May 2007 | UPDATED: 13:48 10 October 2012

The CAA has just announced its revised proposals for Mode S

The CAA is now proposing the following implementation phases for Mode S as detailed below: Phase One The existing requirements for aircraft to carry and operate a transponder would remain unchanged. However, with effect from 31 March 2008 the technical means of compliance would be SSR Mode S instead of the ageing Mode A/C technology.To gain access to the current mandatory carriage airspace, all aircraft will need to be upgraded to Mode S from this date. However, there will be a four year transition period from 31 March 2008 during which upgrades of existing transponders can be completed. All new installations of SSR equipment, or where new aircraft are being brought into service with an SSR transponder already installed, will have to be Mode S compliant after 31 March 2008. No further public consultation on this phase will take place.
Phase Two The CAA intends to conduct further public consultation on its policy aim to expand the requirement to carry and operate SSR transponders. This consultation will seek views on the following proposals: For all VFR flights conducted within controlled airspace to be equipped with SSR Mode S transponders.
On a regulatory framework for the establishment of notified ‘Transponder Mandatory Zones’ (TMZs) within specific portions of uncontrolled airspace. The intention of TMZs would be to mitigate specific risks but with the minimum impact on uncontrolled airspace. For all international flights conducted by powered aircraft to operate with SSR Mode S The removal from the Air Navigation Order of the exemption for gliders from transponder carriage requirements.
With the exception of TMZs, operations in Class G airspace below Flight Level 100 would be unaffected by Phase Two, and the use of Letters of Agreement (LOA) and airspace reservations would continue to be available in specific circumstances. The proposed implementation date for this phase will be 31 March 2009, with a three year transition period to provide time for operators to install the necessary SSR Mode S capability.
John Arscott, Director of Airspace Policy, said: “A strategy to safely increase interoperability over time represents the best way to meet the future demands of all airspace users. The increased carriage of Mode S transponders is a significant step towards airspace safety and meeting this objective.”
Future Implementation Phases It is envisaged that the phased implementation will proceed beyond Phase Two with the aim of expanding SSR transponder carriage throughout all UK airspace and, where technically feasible, to all aircraft as user demand and airspace arrangements require. However, depending on the timescales, the means of compliance for these additional phases will need to take into account new technologies and the need to be consistent with emerging European policy. Additional phases would also be subject to further separate consultation.
Funding The CAA is investigating funding opportunities to support its policy proposals. These include encouraging an industry partnership for the development of a Low Power SSR Transponder (LPST). It is also investigating funding to offset institutional costs, such as certification, which could potentially benefit all affected operators.Further consultation A Full Regulatory Impact Assessment (RIA) and proposed amendments to the Air Navigation Order for Phase One will be submitted to Government for consideration by Autumn 2007. It is expected that the public consultation on the proposals for Phase Two will start towards the end of 2007 and will take place over 16 weeks

More from Gear

Tuesday, September 18, 2018

How air-brained are you? Test your general aviation knowledge on matters including safety, history, training or anything related to flying! Compiled by James Allan

Read more
Monday, September 17, 2018

I see you… But do you see me? Part two of our series on electronic conspicuity focuses on the capabilities – and compatibility – of the existing technology

Read more
Thursday, September 13, 2018

What is electronic conspicuity, how does it work and what aircraft equipment is available? – Part one in a new series | By Philip Whiteman

Read more
Monday, July 30, 2018

We’re offering one lucky pilot the chance to win a Yaesu FTA-750 Spirit air band transceiver worth £380

Read more
Friday, May 11, 2018

The online user portal launched in January by NATS promises to make it easier to cross controlled airspace. We put it to the test. Words by Colin Goodwin, photos by Philip Whiteman

Read more
Monday, April 23, 2018

The IC-A25NE is the latest 8.33 handheld from leading manufacturer Icom. Stylish and packed with features including Bluetooth connectivity and the ability to display navigational information from flight plans uploaded from Andriod or iOS devices, it is designed to ‘change the way pilots fly’

Read more
Wednesday, April 11, 2018

Bose has introduced its new active noise cancelling headset for the flight deck, the Bose ProFlight Aviation Headset, a headset described as lightweight and comfortable with three levels of user selectable active noise cancellation

Read more

Newsletter Sign Up

Pilot weekly newsletter
Sign up to receive our regular email newsletter

Our Privacy Policy

Most Read

Subscribe or buy Pilot Magazine