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

< Back New LAA Inspector - Conrad Ceillam 2 Sept 2025 We are pleased to welcome Conrad Ceillam as a new LAA Inspector, having attended an LAA Inspector Assessment Day at Turweston recently. As a youngster, he worked mostly on 3-engined piston aircraft for commercial flight, and on some twin turboprops in Guernsey. He then moved on to mostly narrow-bodied jets and turboprops, with some executive jets in the UK. Latterly, he worked in Finland on medium-bodied jets, scientific aircraft, and mission/patrol. Since moving to Shetland, he has mostly worked on twin-piston passenger craft. He has held BMAA inspector approvals since April 2023. Next Previous

< Back Telephones 4 Apr 2024 Please note that the LAA phone system is being updated today and currently we are unable to receive any incoming calls. We appreciate the inconvenience this may be causing but we envisage they will only be down for part of the day. Next Previous

< Back The online Permit Revalidation System is live for Gyroplanes! 22 Jul 2025 We are pleased to announce that the online Permit to Fly revalidation system went live today for gyroplanes, both home-built and factory-built! Step-by-Step Video Guide, FAQs and Crib Sheet The step-by-step guide to the new online Permit Revalidation system in the form of an ‘ Online Permit Revalidation Explained ’ video can be found below. This was written for a fixed-wing example, but the majority of questions are the same for gyroplanes and the process for gyroplanes has the same three stages as for any fixed-wing aircraft. We have also compiled a list of ‘ Frequently Asked Questions ’ for you, which are found below. The ' Crib Sheet ' for Inspectors referenced in the video is formally called the ' Airworthiness Review Reference Guide ' and is available HERE . There is a version of the crib sheet for homebuilt gyroplanes, entitled ARR-REF (HOMEBUILT GYROPLANE) and a version for factory-built gyroplanes, entitled ARR-REF (FB GYROPLANE). The Check Flight Schedules for both homebuilt and factory-built gyroplanes have now been combined into a single check flight schedule for gyroplanes, entitled CFS-1 (GYRO). This is available HERE . Previous check flight forms for homebuilt and factory-built gyroplanes are now obsolete. The Permit Flight Release Certificate (PFRC) is now a separate document, where it was previously contained within the application form for revalidating a Permit to Fly. It can be found HERE . Key Considerations There are a few key considerations to ensure a Permit to Fly revalidation under the new system goes smoothly: Please make sure you know your username and password for the LAA website. If you have forgotten your login details, please contact the LAA Office. All aircraft using the new system for the first time will require a check flight no older than 3 months at the time of submission of the revalidation application. This is in order to provide a baseline for the online system. The 3-year check flight cycle will then apply subsequently to most aircraft types. Some aircraft will still require a check flight at every revalidation, these are: Aircraft cleared for Night/IFR. Aircraft which have flown less than 12 hours since the previous revalidation inspection. Aircraft Owners will not have to submit a CFS-1 (GYRO) Check Flight Schedule when applying through the new system. However, a CFS-1 (GYRO) will need to be completed for each check flight and stored with the aircraft’s documentation, so that it is available when needed. We will no longer be accepting old-style (paper or scanned) Airworthiness Reviews for homebuilt or factory-built gyroplanes conducted on or after 22 nd July 2025. Need Help? The ‘Revalidating a Permit to Fly’ page on the LAA website signposts you to all the information you will need and can be found HERE . If you have any problems or questions, please follow the steps below: Watch the ‘ Online Permit Revalidation Explained ’ video found HERE . Read Technical Leaflet 2.00 - 'Revalidating your Aircraft's Permit to Fly,' which has now been updated to include information for gyroplanes. Look at the gyroplane variants of the 'crib sheet' for LAA Inspectors, entitled ' Airworthiness Review Reference Guide ,' which is available HERE . Look at our list of FAQs ,. If steps 1-4 do not help you find the answer, contact LAA Engineering on [email protected] or call (0)1280 846786 20250721 - Permit Revalidation Process FAQs Issue 2 .pdf Download PDF • 198KB Next Previous

LAA are proud to announce our Rally 2025 sponsors Other Attractions The LAA Leicester Rally 2025 opens on Friday 29th August at 9.30 am and closes at 4pm on Sunday 31st August. Aircraft Park – Over 600 aircraft, dependent upon the weather are expected to fly-in over the 3 days of the Rally Airside access - a unique opportunity to inspect the aircraft and chat with the owners Large trade-exhibition: everything from a nut and bolt to an aircraft kit Aircraft Covering Display LAA Team present throughout the weekend Pilot Coaching Scheme coaches available to give advice Flea Market: Sell those unwanted parts or buy yourself a bargain! Speakers Corner: Seminars by keynote speakers throughout the weekend Strut Members' Area Outside catering including bar: Selection of fast-food and beverage outlets including bar and ice cream van; seating area Evening Bar, Food and Entertainment provided by Leicestershire Aero Club On-site campsite GASCo's Aircraft Competition LAA Education and Hands on Skills information and advice Full range of LAA clothing and merchandise

LAA Rally 2025 "Inspired to Fly" LAA are proud to announce our Rally 2025 sponsors We are pleased to announce that the LAA Rally will be held in conjunction with Leicestershire Aero Club at Leicester Airfield on 29th-31st August 2025. Are you interested in sponsoring the event or advertising in the Weekend Show Guide? OR Do you want to display your aircraft project in the Homebuilders tent? Contact Nancy Lillington at [email protected] WELCOME TO THE LAA 2025 RALLY FLY-IN ENTRANCE FEES GENERAL INFORMATION FLYING IN & BOOKING A LANDING SLOT CAMPING & ACCOMMODATION EXHIBITOR INFORMATION OPENING TIMES & CAR PARKING OTHER ATTRACTIONS TROPHIES & AWARDS

The Light Aircraft Association (LAA) is the UK’s principal representative body for amateur-built and vintage light aircraft, as well as supporting some factory-built microlights and gyroplanes. WELCOME TO THE LIGHT AIRCRAFT ASSOCIATION Welcome to the Light Aircraft Association, the heart of a community that lives and breathes recreational aviation in all its forms! With over 75 years of history, no other UK association has the depth of knowledge and experience in looking after our sport. 7,500 Members 2,700 Aircraft 1,600 Build Projects NINE REASONS TO JOIN THE LAA 1 BUILD YOUR OWN AIRCRAFT The LAA was formed out of the amateur aircraft building movement. Even today, you can build an aircraft from the original plans or purchase a modern kit from a recognised manufacturer to build your dream aircraft, with the support of an LAA Inspector. There are so many types to choose from! More Info 2 PILOT COACHING The Pilot Coaching Scheme includes provision of Biennial Reviews and Class Rating Revalidation, as well as Type Conversions, Renewal Training, Differences Training and Licence Migration. Coaches are based all over the UK and willing to travel to meet your needs! More Info 3 LIGHT AVIATION MAGAZINE Our full-colour monthly magazine, Light Aviation , is free to all members and is packed with a wealth of technical and flying information, first-hand reports of members’ flying adventures and aircraft builds, in depth flight tests and so much more – it’s real cover to cover reading every month! More Info 4 ENGINEERING FACILITIES At our core is the amateur built aircraft movement and the comprehensive engineering facilities that support the Permit to Fly airworthiness system. A full time staff of qualified engineers and a countrywide network of Inspectors help make owning and flying your own aircraft both possible and affordable. More Info 5 TRAINING COURSES The LAA provides a wide range of courses for members, ranging from electrics to working with aluminum, aircraft carpentry, composites, Rotax engines or even an Air to Ground Radio Operators' Course! These will help you build or maintain your aircraft to the highest standard and meet LAA members with similar interests. More Info 6 OPERATE AN AIRCRAFT With the LAA fleet size ever increasing, more and more LAA members are operating LAA aircraft that they have not built under the LAA Permit to Fly Airworthiness System. The LAA Engineering Department offers the support you need to fly! More Info 7 MEET FELLOW AVIATION LOVERS! Do you want to meet fellow light aviation lovers? Clubs for LAA members (also known as Struts) meet at a local level to share knowledge and experiences, as well as take part in local events. You can find the 'Strut' nearest to you! More Info 8 MEMBER DISCOUNTS Every year, the LAA hosts a 'fly-in,' known as the 'LAA Rally' or more recently, the 'Grass Roots Fly In.' LAA members benefit from a discounted entry fee! Furthermore, there are a number of LAA-friendly companies that offer discounts and deals to LAA members. These can be found by clicking the button below. More Info 9 MEMBER REPRESENTATION We have an enviable reputation for determination and fairness within the corridors of power in the UK and Europe. We are one of the principle representative groups providing balanced consultative input on matters such as airspace, planning and safety regulation to bodies including the Department for Transport and Civil Aviation Authority. More Info Contact Us Turweston Aerodrome Nr Brackley Northants NN13 5YD Office Phone No: +44 (0)1280 846 786 Office email: [email protected] Engineering email: [email protected] Our office opening hours are Monday to Friday, 9am to 5pm Download Map Local Accommodation

Certification & Approval Having worked out a promising-looking layout, initial three-view and performance and weight specifications, now is the stage where the hard work begins of transforming concepts to working drawings. Essential decisions have to be made about types of material to be used, the structural arrangement, exact choice of powerplant and so on. You’ll probably need to make a cockpit mock-up to check the ergonomics and control system arrangements, and maybe build a flying radio controlled model of the design to give faith in the handling characteristics. With the basic geometry laid out, stress calculations and assembly drawings come next, then drawings of individual piece parts. Keep an up-to-date tally on weights. As the drawings get more detailed you must re-evaluate whether you are going to meet your original targets in terms of weight, strength and aerodynamic cleanliness, whether you need to re-visit your original assumptions or re-design from scratch. Is there a way that the part or assembly can be made more easily, more cheaply, lighter, stronger, more fatigue or corrosion resistant ? Fewer parts and fewer joints generally means fewer problems and less weight. Can you use off the shelf parts rather than having to make them specially ? Are there other aeroplanes around that have already solved a particular problem in a clever way ? Will the aircraft be easy to inspect in service, easy to repair if it gets damaged ? Can it be broken down for transportation ? If the handling isn’t quite right when the prototype is test flown, does the design make provision for ‘tweaks’ to put it right ? Does the design include reserves of strength to cope with weight growth in service and more powerful engines, or is everything pared down to the minimum ? Downloadable Spreadsheets Technical Leaflets Design Tutorials

< Back New Permit Revalidation System Announcement 20 Mar 2025 The new Permit Revalidation System is coming on 15th April - watch the announcement video below to find out more! Next Previous

< Back The New Permit Revalidation System 28 Feb 2025 As the weather improves and the days grow longer, the flying season is just around the corner. Although you may already be thinking about all your usual flying preparations, there is one extra exciting update Owners and Inspectors alike should keep in mind this year: the launch of the new Permit Revalidation System. A flow chart of the new Permit Revalidation Process This new system will be fully online, and submission of your revalidation application will be via the LAA website under the “My Aircraft Details” section. Therefore, before arranging for an inspection this year, please make sure you can access your LAA member page. You can do this by going on www.lightaircraftassociation.co.uk and clicking on the Login button at the top left of the page and checking that your aircraft details are correct. If you have any issues with your login or aircraft details, please contact the LAA Office on 01280 846 786 or via email at [email protected] Screenshot showing where to login on the LAA website Screenshot showing the ‘My Aircraft Details’ button once you have logged into the LAA website Screenshot showing the button to start apply of your Permit to Fly Revalidation in the ‘My Aircraft Data’ area Applying for revalidation under the new system will be straightforward. Aircraft owners will begin the process by selecting their Inspector. Once selected, the Inspector will be notified that an application is awaiting their attention. After the Inspector submits their airworthiness review, the Owner will be prompted to pay for the revalidation, at which point the application will be sent instantly to LAA Engineering for issue. We are also planning to reduce the requirement for a check flight from one to three years for most aircraft types. However, Inspectors will also have the flexibility to request a check flight as part of the revalidation, if deemed necessary. Additionally, once the new system has launched, Inspectors will be able to issue PFRCs up to two years past the expiry of the Certificate of Validity. Please note, these changes, along with the new check flight cycle, will take effect only once the new system is officially launched. As we get closer to launch in April, more guidance, including a video and notes, will be shared with Owners and Inspectors, ensuring a smooth transition to the new Permit Revalidation System. Stay tuned for more! Next Previous

< Back Mandatory Technical Directive issued for Pioneer aircraft 6 Mar 2024 The control horn on the elevator trim tab on a Pioneer 300 failed in flight, which resulted in sever trim tab flutter. A safe landing was made and there was no further damage to the aircraft. MTD-02-2024 requires the checking of this horn on all Pioneer variants to ensure that it is of the correct design standard and recommends regular checks for free-play in the system. Next Previous

< Back The importance of airfield location 12 Feb 2024 The first results of a survey conducted by the new Strategic Airfield Network (SAN) indicate that location is the number one reason airfields consider themselves important. For more information, head to the Flyer article below: https://flyer.co.uk/location-location-location-airfields-are-important/ Next Previous