Rotax 912 Annual & 100 Hour Enhanced Service Class

Expanded Inspection & Service Class

Instructor: Roger Lee in Tucson, AZ

(This is a private class and not a Rotax certified class)

This is a two day class.                                                                                                                                                                                                                                                  

Dates: May 4th & 5th, 2024 Saturday & Sunday  (0800 hrs. – 1700 hrs)  Cost: $450

Do to the hands on work a maximum class size is 10-12. Pre-registration is needed because classes are usually full.

Phone: 520-349-7056   or  Email: roger@lsamechanic.com

Location: Ryan Airfield in Tucson, AZ

Due to a big demand this class is back. Prepare to learn and have fun doing it!


  This is an improved service level class that will raise and improve the 100 hour and annual inspection understanding. It will guide people to perform at a higher level of education and knowledge base whether you are a private owner or a mechanic. After discussions and feedback with the students that have taken this enhanced Service class with mostly hands on instruction they feel like they are capable of performing at a higher level with inspections, performing simple service work and documenting in the logbook over some other service classes. This class will have a couple hours of classroom each day, but the majority of each day is all hands on work with a functioning Rotax 912ULS and a 912iS engine and targeting the 100 hour / annual inspection and general service work. We will perform an actual annual inspection on a functional aircraft and every student will be supplied with an inspection checklist. We will demonstrate and perform other service functions. While working you will be able to ask real time questions and take notes to help your understanding of the work when you return home. This will empower owners and mechanics to perform better 100 hour and annual inspections, better DOCUMENTATION, and service-based maintenance on the 912 engines. This class will expand on the already successful Rotax Service class by incorporating more hands on time, but more importantly it will expand on better logbook documentation and will focus on a more detailed and  proper inspection process while performing service-level work on the 912 UL, ULS & iS class engine and the 914 engine. This enhanced class will help reduce maintenance induced engine problems and simple time consuming inquiries to the Rotax distributors’ and owners’ maintenance based questions.

  The new Expanded Inspection Service Class and associated demonstrations will include, but not be limited to:

Classroom instruction:  each day is 3-4 hours of classroom with engine part props

(Each student to bring a laptop, IPAD or similar media device)

  1. Registering engines
  2. Finding current manuals on the different internet sites
  3. How to use each manual and its content
  4. Having students demonstrate where to find appropriate documentation for given problems
  5. Service Bulletins and related document recovery from the internet
  6. Understanding Service Bulletin and related material
  7. Understanding what is included in the required 25 hour warranty inspection and its importance
  8. Parts’ time limits and their importance
  9. Check list locations, usage and their importance (Inspection check list)
  10. Logbook entries, their importance and the proper way to log engine information
  11. Researching and use of proper fluids (Loctite, oils, lubricants and fuels)
  12. Hose change and its challenges. (The why’s and how’s)

In hangar work and hands on ramp demonstrations:  (approximately 12 hrs)

  1. Following and using the Line Maintenance 100 hr. and Annual check list. (each student will be issued a checklist)
  2. Proper hose inspection and its importance
  3. Proper use of hose clamps, clamping techniques and the tools. Types of clamps and demo each including Oetiker, Band-It, fuel injection clamps and the constant compression spring clamps.
  4. Wiring inspections and what to look for with minor trouble shooting on a few common wiring problems.
  5. Water pump weep hole inspection and what to look for. Information on what to do if coolant is found on the floor from this area.
  6. How to perform an actual oil purge and its proper technique and why this is so important.
  7. Discussion on draining and re-filling the cooling system
  8. Applying heat and vibration shields and what constitutes vulnerable areas.
  9. Remote mounting the oil pressure and or fuel pressure sender
  10. How to remove pins from plastic wiring connectors (i.e. the ignition modules and regulator/rectifier)
  11. Gearbox friction torque test and how to locate the TDC mark
  12. Perform a differential compression test and discuss its indications
  13. Proper K&N air filter cleaning and oiling
  14. Full class involvement in how to do a mechanical carb sync and a pneumatic sync and how to diagnose carb problems with gauges
  15. Carb inspection and weighing floats
  16. Proper spark plug gapping and thermal paste application.
  17. Oil pressure regulator installation. (plug screw, spring and mushroom)
  18. 90 degree coolant elbow inspection for leaks and proper leak repair
  19. Gearbox removal and installation. We will disassemble a gearbox just to allow students to see its interior parts operation (no maintenance, just prep for shipping to a distributor)
  20. Trouble shooting low fuel or oil pressure problems. (How to set up an inexpensive test gauge)
  21. Possible Tanis or Reiff pre-heater application
  22. Fuel pump replacement
  23. Removal and cleaning of the oil tank
  24. Safety wiring the oil pressure regulator plug screw, magnetic plug, air filter and throttle cables when needed
  25. Cutting and inspecting the oil filter (how to wash it for better results)
  26. Header Wrap installation discussion. The do’s and don’ts.
  27. Proper exhaust spring inspection, installation, including safety wire and proper application of high temp silicone
  28. Proper prop pitch setup demonstration. This seems to be a big one for many people. Many owners and A&P’s don’t know how to do this and it’s important for the engine.
  29. Oil and oil filter change and catching an oil sample for a lab analysis. Venting vs Purging
  30. General Trouble shooting (questions & answers)                                                                                                                                            -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------   

    Tucson, AZ Rotax Enhanced Service Class Details

    May 4th & 5th, 2024

      The class is May 4th & 5th, 2024 (Saturday & Sunday). The class will start promptly at 0800 each day. There will be classroom presentation in the Ryan Airfield conference room each day in the morning and work in the hangar each day after the class presentation. There will be a lunch break each day at approximately 1130 hours.

    Please bring a laptop or tablet device in case you need to find Rotax information and manuals on line. There is Wi-Fi in the classroom.

    The class is being held at Ryan Airfield (KRYN) in Tucson, AZ. (9698 W Ajo Hwy).  This is west of Tucson proper and city limits and approximately 15 minute drive from the Tucson Airport (TIA). If you fly in your own aircraft parking is right up at the back door of the conference room. Rental cars are available at Tucson Airport or Enterprise car rental on Valencia road and Uber can pick you up at Ryan if you need a car from there.

    Directions to Ryan Airfield are as follows and can be reached by either Ajo Hwy or Valencia Rd. They both run right in front of Ryan Airport. The conference room is up front at the airport on Ajo Hwy. It is the only building out on Ajo Hwy and the only parking out on Ajo Hwy.

    If you are staying in Tucson central or out by Interstate 10 then take I-10 to I-19 south. Immediately exit west onto Ajo Hwy. Follow this road 12 miles out to Ryan Airfield.

    If you are staying in a hotel out by Tucson Airport off Valencia Rd. Just head west on Valencia until it dead ends right at Ryan Airfield on Ajo Hwy.  or for a unique experience Casino Del Sol at 5655 W Valencia Rd. just 5 minutes down the road from Ryan Airfield. This is a large Native-American Casino.

    There is a restaurant at Ryan field. There a two other restaurants in the area. We can share cars.

    Prepare to learn and have fun doing it!

    For questions call Roger Lee in Tucson, AZ at 520-349-7056


Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

  • Re: Rotax Enhanced Annual and Service Class May 4th & 5th, 2024

    by » 3 months ago

    Hi All,
    It's getting closer to class time and slots are closing up. If you own a Rotax engine you should take a Rotax service class that will teach you all the everyday maintenance , but with our class we not only cover that, but we use a Rotax inspection checklist and go down that item by item. Plus we get into hoses, hose change, clamps and how to adjust your prop the proper way. We delve deep into carb sync and what the gauges are telling you and we do real time carb syncs. You'll learn how to diagnose with gauges. We work on a live aircraft / engine. 
    What's really unique about this class is we keep the class size small at 10 students because you all will be turning all the wrenches and screwdrivers for the annual checklist.
    Because of he way we teach, work on the engine, do an annual on an engine and have all the students do the work this will answer all your Rotax questions and since you are doing all the work you will remember more from this class.

    There is no way you can attend this class and not learn things.

    Roger Lee
    Tucson, AZ

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

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