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E10 Mogas From 1st September 2021, the government mandated that all regular grade unleaded petrol must contain up to 10% ethanol, rather than up to 5% as previously. In the autumn of 2021, most filling stations around the UK re-marked their E5 petrol pumps to show that they now supply E10 specification fuel, and started receiving tanker-loads blended with up to 10 percent ethanol content. For the automotive world this means reduced carbon dioxide emissions, which is better for the environment, and, arguably in terms of eco-desirability, a small further reduction in the reliance on fossil fuel. The automotive industry had been preparing for this change, and people with road vehicles registered after 2002 should be able to switch to E10 without noticing any difference. Unfortunately, the additional ethanol content is bad news for aviation users if we were to ignore the change and start putting E10 in our aircraft regardless. Ethanol is a powerful chemical solvent which can attack components including rubberised gaskets and fuel pipes, older lacquered carburettor floats and composite or plastic components in some newer fuel systems. The doubling of the concentration of ethanol in E10 compared to E5 makes it much more likely that problems will be experienced if these parts are not designed to be ethanol-proof. Ethanol also has an affinity for absorbing water, which over time can then become acidic, attacking metal components in the fuel system and engine. Even if there was a practical way to do so in the volumes of fuel we use in our aircraft, we cannot safely remove the ethanol content from the fuel because the ethanol acts as an octane enhancer, so the washed-out fuel would be left with a reduced octane value, likely to cause detonation problems. Another issue is that ethanol-blended fuel has a lower energy density than petrol, so to develop full power from our engines using an E10 fuel, we may need to richen the fuel/air mixture, for example using a bigger carburettor jet size. Owners of Rotax and Jabiru engines are probably already aware that many of these engines are supplied as being able to use E10 fuel – though with Jabiru engines, in particular, it’s far from straightforward because some of the earlier engines require cylinder head modifications and reduced compression ratio if they are to avoid detonation issues when using any form of Mogas. Jabiru also say that Mogas of any type should not be used in commercial flight schools and only at the owners own risk. Even with a supposedly E10-compatable engine, the chemical compatibility problems with fuel system components are such that the LAA does not at present approve the use of E10 Mogas in any LAA amateur-built or vintage aircraft. For factory-built microlights and factory-built gyroplanes, where LAA is not the approving authority but only renews the CAA’s Permits to Fly, owners need to refer to the TADS for the types for details of the approved fuel types, and monitor the service bulletins from the approved manufacturers for news of any updates. Where we need to be particularly careful in reading-across from (hopefully) a trouble-free transition to E10 in automotive use is the big difference between our petrol cars and the way our aircraft engines are configured. Our cars generally have submerged fuel pumps in their petrol tanks and a sealed fuel system. In our aircraft we have an open-vented tank and usually a fuel pump several feet away, often mounted in a hot area of the engine bay near to the engine exhaust, dragging the fuel through a fairly convoluted pipework system, a filter and fuel selector – all features encouraging a vapour lock - and then to make matters worse we want to climb up to altitude and operate in reduced atmospheric pressure. Modern petrol cars have a fuel injection systems rather than carburettors, a circulating fuel system designed to purge any vapour forming in the fuel line, and an ECU that monitors the engine’s parameters constantly and adjusts the fuel mixture strength and ignition timing to prevent damage to the engine – and if all else fails and the engine should ‘pink’, we can hear it from the driver’s seat and drop a gear to lighten the load. Because of the much higher background noise level in our aircraft, detonation cannot be heard and the pilot’s first indication of a problem may be when the first piston crown disintegrates, or a valve head departs its stem. In conclusion - E10 is presently not approved for use in any LAA aircraft. ‘Hoping for the best’ and using E10 fuel in your aircraft regardless could risk ruining the fuel system components, fibreglass tanks falling to bits, engine failure through contamination of the fuel or ruptured fuel pump diaphragms etc, or more serious engine damage. For most of our engines, UL91 Avgas is the best choice, but 97 octane E5 Super Unleaded remains an alternative to the now-obsolete E5 spec Mogas.

Continuing Airworthiness Information One of the key strengths of the LAA's system is that we can monitor the fleet centrally and keep track of airworthiness incidents from around the world. Where necessary, we can then let our owners know, to help them keep flying safely. A full listing of Airworthiness Alerts, Technical Service Bulletins and Mandatory Technical Directives can be found below: ALERTS, TECHNICAL SERVICE BULLETINS & MANDATORY TECHNICAL DIRECTIVES

< Back LAA Alert for some models of Rotax Engines 1 Mar 2025 LAA Alert A-02-2025 has been published on the LAA website (and is also attached), highlighting a recent service bulletin published by Rotax regarding the inspection and/or replacement of the crankcase and/or gearbox housing on affected engines. Rotax has identified a potential manufacturing issue affecting the hardness values of the crankcase and/or gearbox housing materials in certain engines. These components may not meet the required specifications for material hardness, which could lead to reduced component durability and/or potential oil leakage. Rotax regards this bulletin as mandatory. A-02-2025 - Rotax Crankcase .pdf Download PDF • 220KB Next Previous

Light Aviation Magazine 2023 Click on the links below to open each issue of Light Aviation Magazine from 2023 January 2023 April 2023 July 2023 October 2023 February 2023 May 2023 August 2023 November 2023 March 2023 June 2023 September 2023 December 2023

Light Aviation Magazine 2016 Click on the links below to open each issue of Light Aviation Magazine from 2016 January 2016 April 2016 July 2016 October 2016 February 2016 May 2016 August 2016 November 2016 March 2016 June 2016 September 2016 December 2016

< Back Mandatory Technical Directive issued for Rotax 914 powered Eurofox aircraft 29 May 2024 Mandatory Technical Directive, MTD-03-2024 has been issued today to introduce mandatory disabling of cabin heat on examples of the type fitted with Rotax 914 (and derivative) engines. This follows an in-service occurrence of carbon monoxide entering the cabin due to leaks from the exhaust system. The MTD must be carried out before flight on or after 5th June 2024. This MTD has been emailed to all affected owners. Next Previous

National Private Pilot Licence Latest News - Feb 2026 + Examiner Report for NPPL (SEP/TMG) Skill Test + Please use this FORM to contact us with any NPPL queries you have. + General Exemption E6556 CLICK HERE FOR PCS DETAILS FAQs Details on revalidation of ratings, renewals and more! We will continue to add more FAQs as required. Working on them!! CLICK HERE FOR PCS DETAILS NPPL FEES for SEP / TMG Two payments need to be made: One to the LAA and one to the CAA. Please note that the CAA will send a payment link to your email address For details on how to pay, please visit the LAA Online Shop CLICK HERE FOR PCS DETAILS APPLICATION FORMS All applications that are submitted via email must be as a .pdf, as one document and not individual pages and in colour. Alternatively you can send them by post. Grant of a NPPL (or addition of a rating) with a SEP or TMG Class rating * F or all microlight ratings or enquiries please refer to the BMAA website * CLICK HERE FOR PCS DETAILS MEDICALS Please use the link below for information on how to obtain a medical. Cellma System (portal) To register for the CAA Portal please read CAA Customer Portal Registraion Guide CLICK HERE FOR PCS DETAILS INTERIM CAP 3181 The purpose of this CAP is a temporary measure until the main CAP will be ready for publication. This CAP sets out the requirements and syllabus for student pilots, pilots, instructors, examiners and training organisations to follow the issue of a NPPL (A). CAP3181 CLICK HERE FOR PCS DETAILS

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

< Back MTD-02-2025 issued - Mission M108 Nose Leg Failures 6 Jun 2025 MTD-02-2025 - 'Nose leg failures' was issued today for Mission M108 aircraft. This MTD can be found HERE and is also attached below. Three instances of nose leg failure have occurred in the past 12 months, two of which recently. This MTD mandates the regular inspection of this area until a long-term fix has been put in place. Lambert Aircraft Engineering is working to finalise a solution as soon as possible, working closely with the LAA. We will update the MTD as appropriate once a solution is in place. MTD-02-2025 - Mission M108 Nose Leg .pdf Download PDF • 212KB Next Previous

< Back LAA appoints new CEO 22 Feb 2023 “This is my dream role and I can’t wait to get started!” Simon Tilling has been appointed as the new CEO of the Light Aircraft Association. He will start in his new role in mid-April. Simon brings to the Association a wealth of leadership, general management and customer service experience gained in the technology sector including ‘blue chip’ brands such as Dell and Sony, together with a passion for sport and recreational aviation. Simon is an experienced pilot who has owned various LAA types, including one of the UK’s oldest Taylorcraft Auster aircraft. He’s also a former British Air Racing champion and was from 2020 to 2022 the chairman of the Royal Aero Club ‘3Rs’ committee for races, records and rallies, during which time he regenerated the appeal of air racing to new participants. Eryl Smith, Chairman of the LAA said “I am delighted to announce Simon’s appointment as CEO of the LAA and look forward to working with him to further improve the performance and standing of the Association on behalf of our members.” Next Previous

< Back Mandatory Technical Directive issued for Pietenpol Air Campers 19 Jul 2024 Mandatory Technical Directive, MTD-06-2024 has been issued to introduce mandatory checks for corrosion on the wing rear struts. This follows a recent in-service finding where servere corrosion was found in a flying example of the type in the UK. The MTD must be carried out before further flight on or after 18th July 2024 on Pietenpol Air Camper aircraft fitted with the 'Jim Wills' wing rear struts. Next Previous