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.

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

Modifying & Repairing Aircraft One of the main features of the LAA system is that modifications and repairs can be approved with significantly reduced costs compared with aircraft on Certificates of Airworthiness, where applicants would need to deal with the CAA or EASA. Since the engineering team are all ‘little aircraft’ experts, it is usually a straight-forward job to approve many types of change. Of course, with many of our members being so creative, sometimes the job takes a little more time and thought to approve! View current mod/repair application queue Modifcation Type Description Further Details Application Form Application Fee Category Changes Applications to change an aircraft’s category from a microlight to a ‘Group A’ aircraft (and vice versa) are allocated a modification number to record the change. If an engine or propeller change is required at the same time, then an application must be made as noted above. N/A LAA/ MOD 10 £206 Engine & Propeller Changes These are treated as Prototype or Repeat modifications, unless they appear on the PTL list for the type. Technical Leaflet TL 3.02 LAA/MOD 4 and LAA/MOD 5 * See below Avionics Installations These are not considered modifications, but in order to fulfil their legal obligations, owners are required to keep LAA up-to-date should radio details alter. A special system exists for the approval of radio changes that is separate from other modifications. Technical Leaflet TL 3.03 LAA/MOD 7 No charge for radio/transponder installations, but a £31 fee is chargeable for certified ADS-B Out applications STCs Where a change has previously been approved by means of a Supplemental Type Certificate (STC), an LAA Inspector can sign off the change. Technical Leaflet TL 3.29 N/A N/A The Trivial Change Sometimes a change is so trivial that no application is required and there is no need to inform the Engineering department. Technical Leaflet TL 3.10 N/A N/A Manufacturers' Modifications Kit manufacturers and plans suppliers often have long lists of optional modifications that can be fitted and during the lifetime of a type product improvements are introduced. Generally, LAA-accepted optional items are listed on the TADS for the type. N/A N/A N/A The Standard Modification This is a modification that is very well defined and is applicable to a particular aircraft or engine type or types. Members may nominate new Standard Modifications using form LAA/MOD 9; however, LAA Engineering may choose to convert popular Repeat modifications into Standard Modifications. Technical Leaflet TL 3.06 LAA/MOD 1 Variable, see individual mods for details The Repeat Modification A modification that has already been approved on one aircraft as a Prototype modification. Note that a Repeat modification must identically replicate the original Prototype modification including fasteners and positions of parts and should generally be on the same aircraft type as the original. Technical Leaflet TL 3.07 and TL 3.17 LAA/MOD 11 * See below The Prototype ("normal") Modification This is a normal modification application made in the usual way and is applicable only to the aircraft for which the application is made. Technical Leaflet TL 3.01 LAA/MOD 2 and LAA/MOD3 * See below * All prototype modifications (including engine and propeller changes) attract a minimum fee of £103 which covers up to two hours' work; all repeat modifications (including engine and propeller changes) attract a minimum fee of £52 which covers up to one hour's work. Thereafter, work is charged at £57/hour in either case. See the relevant Technical Leaflet for the type of modification for further details. To access the Technical Leaflets, MOD forms and Standard Modifications described above, click one of the buttons below: Technical Leaflets on Modifications & Repairs LAA MOD Forms Standard Modifications

< Back LAA Head Office closed on Friday 4th July 3 Jul 2025 LAA HQ will be closed on Friday 4th July 2025 due to the Silverstone Grand Prix. All staff will be working from home, so can continue to deal with your calls and emails, but will not be on site at Turweston to answer any questions directly or receive any hand-delivered documents. Next Previous

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

Light Aviation Magazine 2019 Click on the links below to open each issue of Light Aviation Magazine from 2019 January 2019 April 2019 July 2019 October 2019 February 2019 May 2019 August 2019 November 2019 March 2019 June 2019 September 2019 December 2019

Night IFR Certain LAA types can be cleared for flight at night and/or under IMC (instrument meteorlogical conditions) - commonly referred to as 'Night/IFR' for convenience. The special Night/IFR requirements and process are detailed in technical leaflets TL 2.27 and 2.28, linked below, which are additional to the standard requirements applicable to any LAA aircraft. The special requirements involve the aircraft being of a type that demonstrates flight handling broadly in accordance with CS-23 subpart B (some types, including the RV-6 and RV-7, have a restricted aft cg limit to meet the pitch stability requirements), and each individual example must have a special IFR flight test to confirm it matches the first one tested. For a night clearance, the aircraft must also undergo a night test to check its lighting and general suitability for night flight. The aircraft must have accumulated enough flying hours in VFR to prove its reliability, and it must have an engine of a type accepted as being likely to be as reliable as a certified engine (for example we accept ‘clone’ Lycomings even though not certified). The propeller must be rain-proof, i.e. have hardened leading edges, and the aircraft must have an effective carb ice prevention system. The aircraft’s panel must have at least two independent attitude indicators, with either separate power sources or back-up internal power. If two EFIS are used to provide attitude information, with no other attitude instrument, then the two EFIS must be of different manufacturers so as to avoid the risk of simultaneous failures. There must be pitot heat, an alternative static and an OAT gauge. If the essential systems are relying on electrical power, the electrics must be designed to avoid being vulnerable to any single component failure, and if there is a single alternator there must be enough battery capacity to keep the essential systems running for an adequate time (at least 30 mins) before the battery goes flat. If two radios are fitted, they must not be both vulnerable to failure if any single component fails (e.g. must not be both fed through a single avionics master switch with no back-up power available). LAA does not specify what navigation or radio equipment is fitted, but as with a certified aircraft, the equipment fit determines what type of airspace can be used. An autopilot is not required, but certainly helps reduce pilot workload in sustained instrument flight. Non-certified equipment, including EFIS and autopilots, alternators, etc, are permitted, subject to the usual LAA checks. The aircraft has to be inspected initially and annually by an inspector with a special ‘night/IFR’ endorsement on their LAA inspector approval, and the aircraft is checked to have been built to an appropriate level of quality for a night/IFR aircraft. For example, quality of its instrument wiring, electrical power supply wiring, etc, are checked which are much more critical than in an aircraft only flying day VFR. The ASI and altimeter must be regularly calibrated, the battery must have a regular capacity check and the radios checked regularly by a qualified radio engineer. The aircraft must have an accepted pilot’s operating handbook and an acceptable maintenance schedule, and be maintained to that schedule. The application process involves not only a night/IFR inspector but also a night/IFR assessor who is one of a small band of LAA volunteers qualified to assess the design aspects of the aircraft’s systems and who compiles a technical report about the aircraft and if he is happy with it, includes a recommendation to remove the day-VFR only restriction. The report includes details of the aircraft’s systems, the special flight test reports, inspection reports, maintenance schedule and POH, a photo of the instrument panel and an electrical load analysis. This report is sent to LAA Engineering who checks through it and all being well, issues the aircraft new paperwork with the day and/or VFR restriction removed and replaced by limitations allowing IFR and/or night flight. All LAA night/IFR aircraft are restricted to not fly in the vicinity of thunderstorms and, for IFR cleared aircraft, take-off and landing in visibility less than 1500m is prohibited. The aircraft may not be operated in IMC below 500 ft agl for a precision approach, or 600 ft for a non-precision approach, or approach system limits, whichever is the greater. The pilot qualification for flying an LAA night/IFR aircraft at night or in IFR is the same as for flying a certified light aircraft at night or IFR. Aircraft types that have been successfully cleared for night/IFR flight include the RV-6, -7, -8, -9 and -10 (nosewheel and tailwheel variants – some with cg range restrictions), Europa and Cozy. Several of the modern lightweight 600 kg types have failed to comply due to low stability margins making them OK for day VFR flight but not suitable instrument platforms for night or IFR. Whilst a very few Rotax powered aircraft have been be to be cleared, most of the thirty or so LAA aircraft that have successfully transitioned are powered by Lycoming or Lycoming-clone engines. 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

Flight Testing Aircraft The following current flight test schedules are available for printing. These schedules are subject to change at any time and without notice. Ensure that the current flight test schedule is used otherwise it may not be accepted. For this reason it is not advisable to save these document on your computer. Flight Testing Forms & Schedules Other useful documentation is as follows: TL 1.19 Initial Testing Flying Pilot Briefing for First Flight TL 2.00 Revalidating a Permit to Fly CAP 1038 CAA Check Flight Handbook TL 3.19 Auto-Pilot Flight Test Notes TL 3.22 Flight Test Reports TL 3.23 Constant Speed Prop Set-Up TL 3.25 General notes and limitations on test flights Airpseed Indicator Calibration Climb-Performance Plotter FAA Flight Testing Handbook

< Back Engineering updates in October 11 Nov 2025 The following documents have been issued/updated in the Engineering 'Info Library' during October. Continuing airworthiness information : Alert A-11-2025 - Eurostar control system rose joints Alert A-12-2025 - Aeroprakt windscreens TADS: Evektor Eurostar Vans RV-9/-9A Propeller type lists PTL/1 : Murphy Renegade 912 (new) Murphy Renegade Spirit (new) Vans RV-6 (up-issued) Next Previous

< Back Engineering updates in December 2 Jan 2025 The following documents have been issued/updated in the Engineering 'Info Library' during December. Continuing airworthiness information: Mandatory Technical Directive 07-2024 - Eurofox trim cables Alert 03-2024 - Eurostar trim cables Alert 04-2024 - Loose Rotax engines Alert 05-2024 - Rotax 900 series engines - blocked oil spray nozzle Technical Leaflets: TL 2.22 'non-type specific MPDs' TADS : Sling 4 TSi Wishing all our members a very Happy New Year. 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

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.