Infringement of RAF Syerston Aerodrome Traffic Zone (ATZ)

On 3 July 2019, a pilot pleaded guilty to an airspace infringement of the RAF Syerston Aerodrome Traffic Zone in November 2018. The pilot was ordered to pay over £3,200 in fines. The infringement resulted from a number of failings that the CAA’s Airspace Infringement Coordination Group (ICG) is seeing repeated frequently.


In November 2018, a C152 pilot departed Gamston aerodrome to fly to Leicester aerodrome. His planned route would have taken him to the west of Syerston. The pilot’s intention was to fly on a track of 210º from Gamston and turn onto 180º degrees when just past Ollerton (5.5 nm southwest of Gamston aerodrome) towards Leicester. The flight took place in mid-afternoon and the low sun was affecting visibility to the west. The pilot was not equipped with any electronic navigational aid such as a moving map.

RAF Syerston is a government aerodrome with an ATZ of 2 nm radius extending to 2000 ft agl (2,231 ft amsl) lying in Class G airspace. It is served by an Air/Ground (A/G) radio service on 128.525 MHz. The aerodrome is used for glider operations. Gliders are launched by winch and by aero-tow. Winch launch activity takes place up to 3,300 ft amsl and is charted as such with a G symbol on the 1:250,000 and 1:500,000 VFR charts along with the A/G frequency. As with all military ATZ, the details are notified in the UK AIP ENR 2.2.

The flight

The C152 pilot

Outbound from Gamston, as he climbed past 1,500 feet, it became apparent to the pilot that visibility was poor to the south and west. The pilot descended to remain visual with the ground. He believed he turned early and flew on a more south-easterly track than planned. In receipt of a Basic Service from East Midlands Radar, the controller told the pilot that Syerston was active and repeated it to him shortly afterwards. When the pilot encountered a glider in his 12 o’clock, he climbed and manoeuvred to maintain separation. He estimated that the two aircraft had passed within 300 feet of each other but was satisfied that there was “no danger of collision”.

The pilot stated that flying conditions had been difficult. Visibility was poor with low sun. He had ended-up five miles east of where he thought he was. Analysis of radar data showed that the aircraft had flown over Southwell, directly through the Syerston ATZ and overhead the aerodrome to Bottesford. The route had taken the C152 overhead the glider site at 1,578 feet amsl.

The glider pilot

The glider pilot was conducting an exercise within the ATZ at about 1,100 feet and flying northwards. He saw an aircraft flying towards him, over the launch winch, no more than 100 feet above and 500 feet away laterally from his glider. The pilot assessed that the aircraft would come close to him if he did not do something and so he rolled the glider to the right to create distance. The aircraft passed the glider about 100-200 feet to the left and at a similar altitude. The winch operator reported to the pilot that there was an aircraft above him and consequently a glider launch was stopped whilst the unknown aircraft was within the ATZ.

Learning Points

Risk of cable strike

The pilot overflew a glider site, albeit unintentionally, that was annotated on the chart with winch launch activity up to 3,300 ft amsl. A 4.5 mm Dyneema or steel wire in the air, when struck by an aircraft could have fatal consequences for both the aircraft impacting the wire and the glider, if still attached to the cable. Pilots must plan to avoid glider, and other aerial sporting, sites and be aware of what lies along and in proximity of their intended route and near any planned alternates. Check the VFR charts when route planning; a glider site is annotated on the chart as a G in a circle. If winch launching takes place at the location, a figure in thousands of feet will be annotated with the G. For example G/3.5 signifies winch launching to 3500 ft amsl. Where the site is hang or para gliding with winch launching, the chart symbol will be shown with the altitude.

Pilots should be aware that the vertical extent relates only to the maximum altitude of the cable and not to the maximum altitude to which glider, hang gliders or paragliders may be encountered.

Use of a moving map

This is another example of a serious airspace infringement where the pilot was not using a moving map. 85% of analysed airspace infringements in 2017 could have been prevented with the use of such a device. This aid to planning and navigation increases the pilot’s situational awareness considerably thereby allowing more capacity for operating the aircraft and communicating; in essence making navigation more simple. However, with sole use / over-reliance of moving maps, standard navigation skills can fade. When using a moving map it is good practice to have the route marked on a current aviation chart in case the system fails. Similarly, when refreshing chart and VRP navigation, it is good practice to have a moving map as a back-up.

When using moving maps, although the gliding symbol is reasonably clear the difference in presentation from the CAA chart is significant. Pilots are to be aware that on some moving maps:

  • There may be no indication of winch launching.
  • There may be no information of the maximum height of winch launches.
  • There may be no warnings of intense gliding activity.

To see the required information on activity at the sporting aviation site the pilot must select the site by touching the symbol on the chart to open the dialog box. In addition, pilots must check their APP settings to ensure that they have not  de-selected sporting aviation. By doing so, the pilot becomes totally oblivious to any risk.

Met conditions

Both pilots stated that the low sun was affecting visibility. The C152 pilot added that flying conditions had been difficult. Whilst the SERA VMC minima of 5 km visibility may be reduced to 1500 m if flying by day and at 140 kts or less and below 3000 ft for flights outside controlled airspace, pilots must apply Threat and Error Management when deciding if they are going to fly or continue with their flight. When flying at 90 kts, an aircraft takes less than 33 seconds to fly 1500 m.

Pilots, especially inexperienced pilots or those with low-hours must recognise the threats associated with flying at the minima. Faced with the same met conditions, the C152 pilot stated that he would now return to the airfield (of departure).  It is important to know the legal limits as well as your own limits – do not ‘press on’.

Rule 11 of The Rules of the Air 2015

Aerodrome Traffic Zones (ATZ) are established under Rule 11 to are established to give protection to aircraft at the critical stages of flight when departing, arriving and flying in the vicinity of an aerodrome.

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