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

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

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 Engineering updates in October and November 6 Dec 2024 The following documents have been issued/updated in the Engineering 'Info Library' during October and November. Alerts : Alert A-01-2024 Eurostar trim system Alert A-02-2024 Lycoming connecting rod bushings TADS : Europa Eurostar Sling 2 Next Previous

< Back Mandatory Technical Directive issued for many Zenair types 14 Jan 2025 MTD-01-2025 - 'Inspection of horizontal stabiliser (tailplane) attachment brackets and associated hardware for cracks, looseness and other forms of distress' is issued for Zenair CH601, CH650, CH701, CH750 and variants of these four models. This MTD can be found HERE and is also available below. A number of cases have been found whereby the structural integrity of the horizontal stabiliser mountings on the Zenair types identified above have been compromised by one or more of the following: cracking of the attachment brackets oversize holes loose rivets distorted and chafed brackets. These problems could occur due to a number of factors including poor build quality, a build-up of tolerances in the positioning or dimensions of the brackets, improper assembly, rough treatment or in-flight vibration. Failure of a tailplane attachment could result in degraded controllability in flight or loss of control. Special inspections of this area have been recommended by Zenair since January 2017, in their document ‘Mandatory Action. Jan. 2017 – Inspection of Horizontal Stabilizer tail attachment brackets’. This Mandatory Technical Directive mandates this safety action for aircraft operating on LAA Permits to Fly. MTD-01-2025 - Zenair Tailplane Brackets .pdf Download PDF • 162KB Next Previous

< Back Engineering updates in July 7 Aug 2025 The following documents have been issued/updated in the Engineering 'Info Library' during July. Continuing airworthiness information : Mandatory Technical Directive MTD-05-2024 issue 2 - Jabiru distributor caps Mandatory Technical Directive MTD-03-2025 - Marquart Charger aileron slave strut Alert A-05-2024 issue 2 - Rotax engine oil spray nozzle Alert A-07-2025 - Glastar aileron servo-tab pushrod cracking Alert A-08-2025 - Gen 4 Jabiru engine crankshafts Technical leaflets : TL 2.00 - Revalidating your aircraft's Permit to Fly TL 2.19 - The LAA Generic Maintenance Schedule TL 2.33 - Insepctor categories for type TADS : 274 - Europa 315 - Eurostar 324 - Supermarine Spitfire mk26 Propeller type lists PTL/1 : Kitfox mk1/mk2/mk3 Forms : LAA/AR-REF (FB GYROPLANE) - Airworthiness review reference guide (crib sheet) LAA/AR-REF (HOMEBUILT GYROPLANE) - Airworthiness review reference guide (crib sheet) LAA/AR-REF (FIXED WING) - Airworthiness review reference guide (crib sheet) LAA/CFS-1 (GYRO) - Check flight schedule LAA/CFS-1 (FIXED WING) - Check flight schedule LAA/FBG-SUPP - Supplement to factory-built gyroplane revalidaton form LAA/PFRC-1 - Permit Flight Release Certificate LAA/FT-NEW - Flight test schedule, new builds, transfers, modifications and repairs LAA/FT-ENG - Flight test schedule, engine modifications Next Previous

Light Aviation Magazine 2022 Click on the links below to open each issue of Light Aviation Magazine from 2022 January 2022 April 2022 July 2022 October 2022 February 2022 May 2022 August 2022 November 2022 March 2022 June 2022 September 2022 December 2022

< Back Engineering updates in April 6 May 2025 The following documents have been issued/updated in the Engineering 'Info Library' during April. Technical leaflets : TL 2.00 - Revalidating your aircraft's Permit to Fly TL 2.33 - Inspector categories for types (new TL) Forms: LAA/AR-REF - Airworthiness review reference guide (crib sheet) (new form) LAA/CFS-1 (fixed wing) - Check flight schedule LAA/PFRC-1 (fixed wing) - Permit flight release certificate Next Previous

Rotax Carburetted 912/914 Installation & Operation Price Member - £213, Non-Member - £233 Duration Arrival 09:30. Finish 17:00. < Back About the Course Kevin Dilks of SAS, a well-respected and Rotax trained engineer, has many years of experience in the field and will be hosting this course at the LAA’s Training facility at Turweston. The course covers everything those who own/operate a carburetted Rotax 912 (UL, ULS and 914 turbocharged) engine need to know about getting the best out of these very popular engines and keeping them in tiptop condition. Your Instructor Kevin Dilks Dates New date tbc Times Arrival 09:30. Finish 17:00. Duration One day course Venue LAA HQ, Turweston Aerodrome, NN13 5YD Price Member - £213, Non-Member - £233 Booking Pls call the LAA on 01280 846 786 to enquire/book or email [email protected] . *Please note that payment is required when booking, to confirm your place. NO place will be held without confirmed payment* **Please note that your booking payment is non-refundable unless we can fill your place timeously or there are exceptional circumstances**

< Back Two new LAA Inspectors appointed 28 Sept 2023 Congratulations to our latest LAA Inspectors, Luke McMillan and Gareth Rutt. Luke and Gareth both came to LAA HQ at Turweston last Thursday for 'Induction, Examination and Interview Day' with our Chief Inspector, Lucy. We wish Luke and Gareth well as they start this exciting new chapter! Next Previous