Ethanol-Free Mogas Please select the appropriate engine type link below where you will find information describing how to obtain clearance for an aircraft to use unleaded Mogas. For Rotax, Jabiru and VW engines, please see the E5 Mogas page. Continental Hirth 2 Stroke Lycoming Related Information Operating Information TL 2.20 Fuel Flow Checking Inspection Checks - Fuel Flow EASA Investigation on MOGAS EASA has issued the Final Report of the Safety Implications of Biofuels in Aviation (SIoBiA) This project was undertaken by the University of Aachen under a research contract to EASA. The Light Aircraft Association was represented during this project by Barr y Plumb, who was a member of the project steering committee. All aspects of t he use of Mogas containing biofuel additives were considered in the research programme and the final report from the project is now publicly available here . This is a summarised version of the SIoBia findings. Placards Cockpit Placard Fuel Filler Placard

Light Aviation Magazine 2018 Click on the links below to open each issue of Light Aviation Magazine from 2018 January 2018 April 2018 July 2018 October 2018 February 2018 May 2018 August 2018 November 2018 March 2018 June 2018 September 2018 December 2018

Light Aviation Magazine 2015 Click on the links below to open each issue of Light Aviation Magazine from 2015 January 2015 April 2015 July 2015 October 2015 February 2015 May 2015 August 2015 November 2015 March 2015 June 2015 September 2015 December 2015

Night IFR PROCESS SUMMARY LIST OF TYPES PERMIT IFR FEES NIGHT IFR INSPECTORS FAQs POH LITE TEMPLATE (PowerPoint File) NIGHT IFR PILOTS ACCEPTED INSTRUMENTS TL 2.27 - PROCEDURE FOR APPROVAL & TL 2.28 - ASSESSMENT OF AIRCRAFT LAA/MOD15 APPLICATION FORM

We provide a system whereby members can build an aircraft in the comfort of their own home (or wherever they choose) from either a set of plans or from a kit of parts. Every year around 100 newly-constructed aircraft are added to the LAA fleet, with members generally taking around 1 to 4 years to complete their kit projects. A whole range of aircraft is available to build, from single-seaters to four-seaters, aerobatic to amphibian, and WWI replica triplanes to gyroplanes. The LAA is tasked with ensuring that the designs members build meet minimum airworthiness requirements, appropriate to the type. Proposals for accepting other designs of aircraft can be put to the LAA, and a number of such types are accepted each year following a review of their airworthiness, amongst other things. This requires a member to champion the type through the process, arranging for the necessary technical information to be passed to the Engineering department and to build and test the first example. Similarly, it is possible for a member to build an aircraft of their own design. LAA provides support for this (see the Designing aircraft section), but due to limited resources only the most promising/developed designs can be advanced through the system. Building Aircraft One of the founding principles of the LAA is to provide for members wishing to build their own aircraft, either for their own education or to enable them to own an affordable aircraft. Of course, whichever type you choose it is usually possible to customise it to your liking using the LAA’s modification system. So if it’s an elaborate avionics suite that takes your fancy or an automotive engine conversion, there’s a route to investigating whether it’s possible. If you like the idea of building, but feel you lack the skills, then there are courses on various aspects of aircraft building to help bring you up to speed. Your Inspector is also a fantastic mine of information and generally will be your first port of call for technical information. Of course, the LAA also has a pool of full-time engineers who can be contacted for advice. For further information, click the button below for Technical Leaflets covering the Build Process Click here for more information

LAA are proud to announce our Rally 2025 sponsors The 2025 LAA Rally will take place at Leicester Airfield over the three days Friday 29th to Sunday 31st August. We are excited to be working with Leicestershire Aero Club to host the event at Leicester Airfield. The weekend will focus on the fly-in and social elements of our annual event; provide the opportunity to see a wide range of exhibitors, hear from industry experts in our Speakers Corner programme of talks, get hands-on skills experience in the Homebuilders marquee; meet our LAA team, purchase LAA merchandise and relax in the Struts & Clubs stand. We are reverting to our traditional exhibition layout which provides for a series of marquees housing all the LAA activities; indoor exhibitor space and our homebuilders exhibits. Outside provides the space for larger displays and we will look forward to showcasing manufacturers and distributors of a wide range of the latest aircraft types from across the LAA fleet. The Speakers Corner marquee, will host a varied programme of talks throughout the weekend, including an open Q&A session each day with CEO, Simon Tilling. Members will have free access to the aircraft park, with access available at an additional charge to non-members enabling everyone to get up close to inspect the wide range of aircraft attending the Rally. The exhibition site will host a wide selection of food choices, a full bar and ice cream van during the daytime whilst evening entertainment, food and bar will be provided by Leicestershire Aero Club. There will be free car parking and on site campsite. We look forward to seeing you at Leicester! Introduction

Lycoming Lycoming engines in certain specific airframe types have been approved by the CAA for the use of unleaded Mogas, using the process described in CAP747 , See Section 2, Part 4, General Concession 5. This involves purchasing an STC (Supplemental Type Certificate) from either the EAA or Petersen Aviation in the USA and carrying out the actions called for by the STC. The procedures stated in CAP747 may be followed for LAA aircraft but only for aircraft with the exact same engine/airframe combinations quoted on in CAP747.. An LAA inspector must check that the aircraft operator has obtained a copy of CAP747, Section 2, Part 4, GC5 and of the appropriate STC and complied with the actions called for therein, and signed off a suitable logbook entry accordingly before the aircraft may be flown with unleaded Mogas.

LAA are proud to announce our Rally 2025 sponsors General Information Event Opening Hours 9.30am – 5.00pm each day (Fri & Sat) 9.30am – 4.00pm (Sun) Fly-In Instructions Up to date fly-in instructions can be found here . Please read these before you fly into the Rally. Camping Camping facilities providing basic amenities including hot showers will be available on site. There is ample ground for caravans and motorhomes. The site will be up and running from Thursday afternoon and will close early on Monday morning. Camping passes can be bought in advance via the LAA Shop . In addition to catering provision on the exhibition site, evening food and a bar will be available on the Thursday, Friday and Saturday evenings with entertainment on Friday and Saturday evenings, provided by Leicestershire Aero Club. Parking Please follow the signs to the designated free Rally Car parks. Designated parking will be signed for Disabled and Exhibitor users. You must display a Blue Badge if using Disabled Parking areas - any car without a Blue Badge will be asked to move to the main parking area. All emergency access ways must be kept clear. Please ensure you are familiar with the routes and do not block with vehicles or stock. Please do not block emergency gates onto the airfield. You must ensure that you keep the roadway clear for all other users. Dogs We understand that many visitors wish to bring their dogs with them, we welcome dogs on site. However, as this is an operational airfield, all dogs MUST BE KEPT ON A LEAD when on any part of the site. Dogs are not allowed in the aircraft parking areas. Please ensure you pick up after your dog. Anyone caught allowing their dog to foul without picking up will be asked to remove the dog from site. All dogs must have an identity tag with contact tel no on. WiFi Should you require WiFi, then please bring your own supply. Please be aware that due to the remote location of the airfield, WiFi reception can be unreliable. Water Drinking water is on the campsite and at the tower. There is an outside tap at the tower. Waste We operate a clean site policy and therefore all exhibitors, visitors and traders should remove their own rubbish from their pitch. A skip will be provided on site for cardboard and general rubbish. No electrical or hazardous materials should be disposed of in the skip. Toilets & Shower Facilities Toilets will be provided in the exhibition site, in the aircraft park and on the campsite, together with hot shower facilities. First Aid First Aid cover is provided by an external third party for the duration of the event. In the event of an emergency, please contact them or a member of Leicester Airfield staff. Fire Fire Marshals will be in attendance and should be contacted in the unlikely event of fire. Please ensure all flammable materials are kept away from possible sources of ignition. Dispose of any rubbish in the skips provided. No naked flames are allowed on any exhibition stand or trading stand. Security Regular patrols are carried out by our contracted security staff. e-Scooters No e-Scooters are permitted on site.

Hirth 2 Stroke Covering Letter to Owners Fuel System Inspection Checklist

Preliminary Design Preliminary Design is the stage where the design is sized and developed in outline, leading to a three view drawing, performance and weight predictions. To help with this, LAA has developed a number of spreadsheets. Spreadsheet 1 is used to develop the basic geometry of the proposed aircraft, size the wing, fuselage and tail surfaces and work out some of the key parameters used later. Spreadsheet 2 is used to estimate the performance of the aircraft based on the geometry, initial weight estimates, engine power and guestimates of the drag coefficient and prop efficiency, allowing you to see how the performance is affected by changing each parameter in turn. Spreadsheet 3 is used to work out the critical structural speeds, develop the flight envelope and predict the aerodynamic loads on the main surfaces which can be used to size the structure, and as the basis for a load test program. The weight and balance spreadsheet elsewhere on our website allows the designer to quickly evaluate the implications on weight and cg of different positions for the crew, fuel tanks and baggage bay, and work out what empty aircraft weight and cg he must aim for. Thanks to the simplicity of these programs it takes only minutes to study the implications of changing the aircraft’s specification, for example the effect of changing the wing aspect-ratio, the trade-off between extra weight and cleaning up the airframe drag, extra power etc. Downloadable Spreadsheets Worked Spreadsheet Examples Design Tutorials

Inspector Training Seminars In 2018, the ‘Inspector Training Seminar’ (ITS) scheme was introduced. This means that, in order to continue operating as an Inspector, every Inspector must attend an ITS in the previous four years, as assessed on 31st March each year, as part of their recurrent training. All Inspector Training Seminars for spring 2025 have now been completed, there will be more Seminars planned for Autumn and Winter. Each Inspector Training Seminar is free-of-charge and includes a complimentary lunch. The day runs from 0930 to 1630. Any Inspector is welcome to book onto a seminar, effectively resetting their ITS attendance and therefore, recurrent training, early; but priority will be given to those Inspectors due for review by 31st March 2026. Please contact LAA Engineering for further details of exact venues and booking details.

E5 Mogas Inspection Checklists for Jabiru 2200A, Jabiru 3300A, Rotax 2 Stroke, Rotax 4 Stroke, VW and VW-based engines can be found at the link below Inspection Checklists Other useful documentation is as follows: TL 2.26 Procedures for E5 Mogas use TL 2.20 Fuel Flow Checking Inspection Checks - Fuel Flow Rotax Service Instruction for 912/914 Rotax Service Instruction for 2-strokes Jabiru Service Letter Buy Mogas Placards Cockpit Placard Fuel Filler Placard