"Early Growth"

Opposition To “Early Growth”

Heathrow’s proposals for “Early Growth” would mean flights directly over many areas of Chiswick not previously overflown potentially from 2022. If Heathrow have their way these flights will happen regardless of whether a new runway is built ! For a more detailed explanation of "Early Growth" see the section below.

Early in 2020 CHATR will publish guidance on this website as to how residents can fight these proposals.


“Early Growth” Explained In More Detail

Heathrow would like to increase capacity from the present limit of 480,000 to 505,000 Air Traffic Movements (“ATMs”) per year. Heathrow describe this as “Early Growth” as they hope this will be permitted by 2022/23 significantly in advance of a third runway.

In order to achieve this Heathrow have put forward an Airspace Change Proposal. This is based on new technology called Performance Based Navigation which they believe makes Independent Parallel Approaches (“IPAs”) to the northern and southern runways at Heathrow technically feasible. The use of this technology and these flightpaths is still subject to the approval of the Civil Aviation Authority (“CAA”). The increase in capacity being sought (25,000 ATMs) to utilize these new flightpaths is also still subject to separate planning approval.

If Heathrow obtain CAA approval but not the planning approval for extra capacity they may still seek to divert existing capacity to these new routes.

The design envelopes prepared by Heathrow (which show the area within which flightpaths are expected to be located) in respect of these IPAs predominantly affect areas not previously overflown. A large number of communities in this constituency will be affected in this way. The impact on amenity, wellbeing and health will be very significant.

For reference below is a link to the Heathrow document “Making Better Use of Our Existing Runways”. Details of the IPA design envelopes may be found on p18-23.


Even those communities already overflown will be badly affected through loss of respite. Presently aircraft land on one runway and take off on the other until 3.00pm. The use of the runways is then switched from 3.00pm. This has provided communities currently beneath the flightpaths with a crucially important period of respite for half a day. The use of IPAs would mean that aircraft would also land on whichever runway was being used for take offs. Those communities below the approach to that runway would in effect lose their respite period.

The impact of “Early Growth” through the use of IPAs is worsened by the fact that the greatest concentration of their use is expected to be between 5.45am and 6.45am. Sleep disturbance is now understood have significant health impacts.