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97 Octane Super Unleaded Since the replacement of regular E5 Mogas at the pumps by E10, for the time being at least, Mogas users have an alternative option in the form of 97 RON Super Unleaded fuels. 97 RON Super Unleaded fuel supplied by garage forecourts is NOT necessarily ethanol-free, but its ethanol content will be capped at a maximum of 5%. 97 RON E5 Super Unleaded fuel can be used under the LAA process for E5 Mogas, as before. There’s currently no legal requirement for ethanol to be present in super unleaded petrol and in fact, quite a few members have reported that their tests have shown Super Unleaded fuel to be ethanol-free in their areas. Esso reports that “Synergy Supreme+ 99 is actually ethanol free (except, due to technical supply reasons, in Devon, Cornwall, North Wales, North England and Scotland). Legislation requires us to place E5 labels on pumps that dispense unleaded petrol with ‘up to 5% ethanol’, including those that contain no ethanol, which is why we display them on our Synergy Supreme+ 99 pumps”. Shell, BP, Tesco and other fuel suppliers don’t commit to such detail, merely stating their fuels “may contain up to 5% ethanol”. Of course, many LAA members have been using Mogas of one sort or another for many years. For many airstrip users, the prospect of having to go to an airfield to fill up with Avgas would seem at best very off-putting, and at worst totally impractical for their style of operation. Hopefully Super Unleaded will continue to be an option using the LAA’s E5 procedure. Where 97 octane E5 super unleaded can be found that’s ethanol-free, it can be used in the broader range of LAA aircraft with engines eligible for use with E0 unleaded fuel. But it is important that Mogas users take on board the fact that unlike with aviation fuels, automotive fuel specifications generally only describe the properties of the fuel blend, in terms of octane rating and other characteristics, they don’t specify the chemical make-up of the fuel. Apart from specifying broad maxima and minima for those components that the powers-that-be wish to either encourage or discourage, the specifications leave to the fuel supplier the choice of how to blend the fuel to achieve the described properties. In some cases it’s the relatively small amounts of additives that cause compatibility issues, rather than the main components of the fuel that cause the problems – and the mix of additives may vary from one batch to the next. With Mogas of any type, what you get from the pump one week may be different to what you get the week after, or got the week before. The fact that your fuel system pump diaphragms, seals, composite tanks and so on might have been unaffected by Mogas up till now does not guarantee that they will be OK with the blend that the next tanker-load brings to your garage forecourt. Unfortunately there is no simple answer to this, and the only way to mitigate this problem is by constant vigilance, and thoughtful adaption of your maintenance schedule to check for signs of problems developing before they create a safety issue – more frequent checking of filters, changing of fuel lines etc. Signs to watch out for are swelling of rubber components like diaphragms, fuel valve seals and O rings, fuel pipes hardening or developing surface cracks, fuel tank sealants wrinkling or detaching from the internal surfaces of fuel tanks. Varnishes on cork floats may go gummy, or plastic carburettor floats absorb fuel and lose buoyancy, causing a rich mixture and rough running. Watch out for discolouration of the fuel you take out as fuel samples, which may imply something dissolving somewhere in the system, and for corrosion in the bases of your carb float bowls and gascolator. Avoid letting Mogas go stale in your fuel system – drain it out before a long period of disuse. Don’t leave the tanks empty for a long period – better to fill them with Avgas which will reduce condensation, and also, particularly with plastic tanks, prevent the tank’s internals drying out which can cause problems with shrinkage, and in extreme cases, the tanks splitting open. O rings and other rubber parts are best kept submerged in fuel continuously. We’ve seen cases where composite aircraft skins have rippled apparently due to exposure to the vapours created by the break-down products in stale Mogas, after being left unattended over a single winter. Mogas is blended with the expectation that in a car it will be used within a few weeks of being supplied, so it doesn’t need to be as stable over a long period of time as an aviation fuel. If a composite or plastic fuel tank is built into your aircraft, consider carefully whether you want to run the risk of having to replace it should the tank deteriorate with Mogas exposure, with all that that implies. With an integral tank in a wet-wing Jabiru aircraft, the answer should be certainly not – but even with the embedded polyethylene fuel tank in a Europa’s fuselage, changing the fuel tank is not an operation for the faint-hearted, involving cutting out quite large parts of the fibreglass cockpit module to release the tank, and then scarfing them back again afterwards in-situ. The Europa kit was first produced in the era of four-star Mogas, a very different blend to what we find at the pumps today. Ethanol-proof rubber hoses are available. In particular SAE J30/R9 or the European equivalent DIN 7339 D3 are automotive hose standards that are widely available from auto factors, and should be used in preference to the older SAEJ30/R6 standard hose which is more permeable to fuel vapour and will more quickly harden and crack, particularly using fuel containing ethanol. The SAE spec J30/R14 is a lower pressure, more pliable version for carburettor systems. Watch out for cheap imitations – the real McCoy should come from a reputable manufacturer, be marked with the SAE number along its length and will likely cost at least £10 a metre. What can we do to help the situation ? It may be that off-the-shelf drop-in-the-tank additives can be used to mitigate some of the problems with mogas fuel, in particular, stabilisers and anti-corrosion products, just as they are routinely in the marine and race-car world. Not knowing what’s in them, we recommending steering clear of any additives that claim to boost the fuel’s octane. Definitely avoid additives that claim to actively enhance an engine’s power or fuel economy, other than just to restore proper performance by giving the carburettor jets and orifices an occasional clean-up. For most aircraft engines UL91 Avgas remains the ideal fuel, in that it is a tightly-controlled aviation-grade fuel of a guaranteed composition, blended for long-term stability and optimal volatility for aviation use. As it is in effect the familiar 100LL Avgas but supplied without its tetraethyl lead, any fuel system designed for 100LL Avgas will be unaffected by using UL91 fuel, or, if circumstances demand, by a mix of 100LL and UL91. Despite a pervasive mis-conception, UL91 fuel is NOT Mogas and suffers from none of the issues associated with Mogas use in aircraft. A list of engines suitable for use with UL91 fuel can be downloaded from the ‘operating and maintaining an LAA Aircraft’ page of the LAA’s new website. Moves are afoot to increase the number of airfields supplying UL91 fuel, with full LAA backing.

< Back LAA members - Make your views known! 25 Jan 2024 Basingstoke & Deane Borough Council's consultation on their draft Local Plan – which includes a proposed new Popham Garden Village on Popham Airfield, has opened. It runs until 4 March 2024. This proposal is not in line with either Government policy or their stated aim to make the UK the best place in the world for General Aviation. The Government's policy can be found in their publication ' Flightpath to the Future " and makes repeated references to the vital importance of airfields, forming a critical part of national infrastructure. You can have your say and tell Basingstoke & Deane Council that their proposal is contrary to Government policy and insist the proposal is removed from the current ‘draft’ strategic plan. Visit the Local Plan Update ' Have Your Say ' section of their webiste. Next Previous

< Back LAA RALLY 2026 - Speakers Corner 28 Aug 2026 Speakers Corner timetable has been released. Please click on link below to access the full schedule. Speakers Corner Speakers Corner 2026 .pdf Download PDF • 67KB Next Previous

What does the Pilot Coaching Scheme offer? Licence Revalidation & Renewals LAA Coaches can provide the “one hour with an Instructor ” flight at any time in the second year of your licence revalidation period, and then sign the revalidation if you have already flown the required hours. They all hold UK 'R' examiner privileges, so can also revalidate ratings on UK PPLs and NPPLs once all the requirements have been completed, even if they have not flown with you. All Coaches are allowed to do Renewal Training under the LAA DTO to assist pilots to prepare for their General Skills Test to get their lapsed licence back. Differences Training "Differences Training" requires the acquisition of additional knowledge and training on any appropriate device, or on an aircraft. It requires both ground and flight training and must be endorsed as having been completed by a suitably qualified Flight Instructor or Class Rating Instructor. Features which, when first experienced, require differences training are: Turbo-charged or Super-charged engines Variable pitch and constant speed propellers Tail wheel undercarriage Retractable undercarriage Cabin Pressurisation EFIS Single power lever control (SPLC) Microlights Additionally, for the UK National Private Pilot's Licence (NPPL) SSEA class rating, differences training is required for aircraft with a cruise speed in excess of 140 knots indicated airspeed. Familiarisation Training Before flying any type or variant of aircraft which you’ve not flown before, within the Single-Engine Piston (SEP) class, you must complete "Familiarisation Training". This is the correct modern terminology for what would previously be described as being "Checked Out" on a new type. "Familiarisation Training" requires the acquisition of additional knowledge by one of the following means: Self-study of appropriate material about the aircraft such as the Pilot Operating Handbook, Pilot’s notes, etc Training with a suitably qualified instructor A verbal brief from a pilot already familiar with the type , particularly in the case of a single seat aircraft, With multi seat aircraft, while it may be helpful to fly with another pilot already familiar with the type, pilots should note that only qualified instructors are authorised to provide training, including familiarisation training and this could lead to difficulties if an accident were to occur that was supervised by any pilot other than a qualified instructor. In addition, when first transitioning to flying types or variants of aircraft which include various specific more demanding or unusual features, that he or she has not previously experienced as pilot in command, a pilot must also have differences training with a qualified instructor to teach them to safely deal with the feature or features concerned. Whilst differences training with an instructor is mandatory, we also recommend you include ground and flight training with an instructor as part of your familiarisation training. Type Conversion If you're thinking of buying an aircraft, where do you go for a type conversion? The PCS has coaches who are experienced on a variety of modern and vintage types. Your coach will take you through your conversion until you are competent on type. Licence Migration The PCS can assist you to upgrade your licence to a different type and also add additional ratings e.g. NPPL(M) to NPPL(SSEA) etc. Miscellaneous Although we do offer specific courses, our coaches are available to fly with you for any flying training you may need in your aircraft. This can include revision of, for example: Practice Forced Landings; Circuits; Stalling; Navigation; R/T and more. Whilst we do not, at present, offer ab initio training, a number of our coaches are also fully qualified Flying Instructors and so may be able to assist with any training issues you may have.

< Back LAA Alert A-01-2026 - Eurofox Tailplane Struts 5 Jun 2026 LAA Alert A-01-2026 - Eurofox Tailplane Struts This Alert has been issued to raise awareness of the possibility of a serious structural failure of the aircraft if the tailplane struts on Eurofox type aircraft are incorrectly assembled. In the event that the tailplane struts are found to have been mis-assembled, or the aircraft is suspected of having flown in the past with the struts mis-assembled, the aircraft should not be flown until such time as the strut attachment lugs have been confirmed to be free of cracks and the struts correctly re-positioned. If cracked lugs are suspected, consult LAA Engineering for advice about suitable NDT or other inspection of the strut attachment lugs. Re-fitting the tailplane struts is an operation that requires an inspection by an LAA inspector and signing of a PMR statement before flight. Please refer to the LAA Alert A-01-2026 HERE or below for full details and recommended checks. A-01-2026 - Eurofox Tailplane Struts .pdf Download PDF • 282KB Next Previous

< Back LAA Alert published for Gen 4’ Jabiru 2200 and 3300 engines 1 Mar 2025 LAA Alert A-03-2025 has been published on the LAA website (and is also attached), highlighting the recent service bulletin, JSP 051, published by Jabiru Aircraft Pty Ltd, which applies to specific Jabiru 2200 and 3300 engines and requires the replacement of the pistons on engines within certain serial number ranges, which they state were supplied between April 2017 and August 2019. Jabiru regards the Bulletin as mandatory. The Bulletin advises that Jabiru has identified that pistons supplied with the affected engines were in some cases susceptible to failure, and have specified that the pistons must be replaced by pistons of the later, improved design at or before 200 hours running time, following the procedures shown in the engine overhaul book, including any necessary running-in provisions and choice of oils. A-03-2025 - Gen 4 Jabiru 2200 and 3300 engines .pdf Download PDF • 201KB Next Previous

< Back Permit Revalidation Forms updated 1 Dec 2023 The Airworthiness Review Report (LAA/ARR-1) and Permit Revalidation Application (LAA/PTF-REVAL) forms have both been upissued to Issue 6. These forms form part of the Permit to Fly Revalidation Process. The latest issues of the forms can be downloaded here . Technical Leaflet 2.00 (Revalidating your Aircraft's Permit to Fly) has also been updated to Issue 5 to reflect these changes and can be downloaded here . Next Previous

< Back Positive Progress 11 Sept 2026 Positive progress on the investigation into the tailplane attachment bolt hole positioning issue We wanted to provide a further update on the investigation into the tailplane attachment bolt hole positioning issue identified in some RV aircraft, and to share the encouraging progress that has been made. Since issuing MTD-07-2026 on 19th August and the revised Issue 2 on 25th August, which included a helpful relaxation of one of the edge-distance limits, we have received around twenty reports from owners whose aircraft were found to be outside the published criteria. Van's Aircraft has received more than sixty similar notifications following the release of Service Bulletin SB-00134. Many of these reports have provided valuable data, which is helping build a clearer understanding of the issue across the wider RV fleet. Over recent weeks, LAA Engineering and Van's Engineering Team have been working closely together, reviewing these reports on a daily basis. By examining the various types of edge-margin discrepancies in detail, we have been able to develop a much better understanding of the structural implications and the most appropriate solutions. Following a very productive meeting on 9th September with Van's Chief Engineer, Rian Johnson, LAA Engineering will now reassess all reported LAA cases in light of this latest technical work. We are optimistic that a number of aircraft may be able to return to flight immediately without further action. Others may require only limited rework, while a smaller number may need more extensive rectification. These reported cases are our highest priority, and we intend to provide individual responses to affected owners by 18 September 2026. Where a straightforward solution is not immediately available, we will look to Van’s for a proposal of how to deal with the individual aircraft. A particularly positive development is that Van's has completed additional finite element analysis of the affected structure and, based on these findings, has released Revision 2.1 of Service Bulletin SB-00134, dated 4th September. This latest revision introduces further relaxations to some of the bolt-position criteria, reflecting increased confidence in the structural capability of the design. In certain cases, aircraft previously considered non-compliant may now be acceptable for continued operation, subject to periodic inspections. We are currently awaiting some additional technical data relating to Service Bulletin revisions 2.0 and 2.1 before publishing MTD-07-2026 at Issue 3. Until the revised MTD is issued, owners carrying out MTD-07-2026 Issue 2 must continue to apply the criteria contained within SB-00134 Revision 1 and continue reporting any non-conformances to both the LAA and Van's. We are in the process of updating MTD-07-2026 to reflect the latest engineering findings from Van's and to incorporate any additional improvements that can simplify inspections and minimise disruption to owners. Our aim is to provide clear, practical guidance that supports both safety and continued flying activity wherever possible. If your aircraft is found to be non-conforming, we would be grateful if you could also include photographs of both bolt groups from above and below (using a mirror or endoscope where necessary). These images are proving extremely valuable in helping our engineers assess each case efficiently and determine whether any corrective action is required. We appreciate the patience and cooperation shown by RV owners throughout this process. The close collaboration between owners, the LAA and Van's has already produced significant progress, and we remain committed to restoring aircraft to service safely and as quickly as possible. For reference, copies of the documents mentioned above are provided below. 20260825 - MTD-07-2026 - Vans Horizontal Stabiliser Attach Position Iss 2 .pdf Download PDF • 476KB SB 00134 - Horizontal Stabilizer Forward Attach Bolts - Rev 1 .pdf Download PDF • 1.57MB Next Previous

< Back New Head of Continuing Airworthiness and Inspection 3 Dec 2024 The LAA is very pleased to announce that Lucy Wootton has been appointed as the new Head of Continuing Airworthiness and Inspection. LAA CEO Simon Tilling continues: “We have taken the opportunity to bring together the inspection and airworthiness teams under one leader. Currently Continuing Airworthiness and our nationwide team of Inspectors are interdependent functions, bringing them together allows for closer co-operation and the alignment of objectives and actions. This new, combined team has the overall objective of ensuring and maintaining the safety and airworthiness of the LAA fleet of more than 2,700 aircraft. It’s responsibilities will include: Airworthiness audits (ACAMs) Permit to Fly Revalidation Process & PFRCs Tracking, analysis, and management of airworthiness issues and identification of solutions Promulgation of continuing airworthiness Information (TADS, Alerts, TSBs, MTDs, Light Aviation Magazine, website) External Liaison (AAIB, CAA, BGA, BMAA) Inspector Induction Support Training, development, and record keeping Communication Performance management Authorisations Contribution to processes and procedures (EPM, Exposition, SPARS, TLs etc) Lucy joined the LAA in August 2022 as Chief Inspector. She has a first-class Masters degree in Aeronautical Engineering, with Honours, from Loughborough University, having spent five years there, including a year’s placement at Rolls-Royce in Failure Investigation, for which she achieved a Diploma in Industrial Studies. Lucy has also been a British Gliding Association Inspector for more than 10 years, as well as an ARC Signatory. Lucy holds a PPL(A) for both single-engine piston aircraft and touring motor gliders, with a night rating, instrument rating(restricted) and sailplane towing rating. Prior to joining the LAA, Lucy worked as an Aircraft Structural Repair Design Engineer for a major aeronautical engineering organisation. Since joining the LAA as Chief Inspector, Lucy has been instrumental in the continuing development of the LAA Inspectorate, who are recognised for their knowledge and skills and professionalism across the aviation industry." Next Previous

< Back New LAA Factory-Built Gyroplane Inspector - Kevin Whitehead 3 Apr 2026 We are pleased to welcome Kevin Whitehead as a new LAA Inspector, having attended an LAA Inspector Assessment Day at Turweston recently. Kevin joins us as an LAA Factory-Built Gyroplane Inspector based in Scotland, further strengthening our support for members and aircraft owners in the region. In his role, Kevin will carry out maintenance and repairs, conduct permit renewal inspections, and provide recommendations to help ensure the continued safety and airworthiness of LAA aircraft. We are delighted to have Kevin on board and look forward to his contribution to the LAA community. Next Previous

< Back Engineering updates in August and September 1 Oct 2024 The following documents have been issued/updated in the Engineering 'Info Library' during August and September. Standard modifications: Europa SM12871 cockpit fresh air rotary ventilators issue 2 Propeller type lists PTL-1 : Aeronca 7-series Kitfox mk1-mk3 Next Previous

< 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