Rotax 912 gearbox Inspection Time table

[roger lee]

Hi All,

Here is a reminder about our Rotax 912 gearbox inspection time table. There are many getting close or already there so make sure you get this done when it is due. It is a requirement. The only one who can do a gearbox is a "Heavy Maint" rated mechanic. You do not want your backyard mechanic to mess this up. You also need a special tool to compress the gear set down and a hydraulic press.

If you have an engine that has the 2000 hr TBO and use 91 oct. unleaded fuel then you are due at 1000 hrs.
If you have the 2000 hr TBO and use 100LL more than 30% of the time you are due at 600 hrs.
If you have a 1500 hr. TBO and use 91 oct. unleaded fuel you are due at 800 hrs.
If you have a 1500 hr. TBO and use 100LL more than 30% of the time you are due at 600 hrs.

I'm sure the rates to do this will differ because of labor cost at each facility. To clean the clutch of the lead if you have used 100LL then it will be approximately $100 + shipping from the distributor. You do not necessarily need new bearings, but if you choose to add that as an option it is about $160 in parts and another $100 in labor.
All you really need is new Bellville washers ($60) and shimming. If you need only the inspection then you are looking at roughly 2.5 hrs labor plus the $60 for the washers. This should be all most of us need. You can have the shop at your location do it right there or send the gearbox out. Shipping the gearbox is quite easy. If you have any questions you can call me or Jeremy at CPS. Jeremy can do these inspections at CPS and I'm also Rotax Heavy Maint rated here in Tucson.

If you are an owner that blends their fuel with a 50/50 mix of 100LL and 91 oct. then your due at the earlier times.

If you use 100LL then you will also have to send the slipper clutch in to one of the distributors (CPS, Lockwood or Leading Edge) to have the clutch dismantled and cleaned of the lead paste that will render the clutch either inoperable or greatly inhibited.

There is nothing really good to be said for 100LL and if your aircraft can use 91 oct. unleaded regardless of the ethanol or not, then you are way ahead of the maint game and it saves you a lot of money, even from day one starting with low time oil changes.