Time Between Overhauls (TBO) for Rotax Aircraft Engines

Time Between Overhauls (TBO) for Rotax Aircraft Engines

Rotax 2-Stroke UL Engines Rotax 4-Stroke UL Engines
912UL 912 ULS 912 ULSFR 914UL
300h / 5 years All
600h / 10 years 4,152.666
SI-26-1994
to 1200h
1000h / 10 years 4,418.103
SB-914-027UL
to 1200h
1200h / 10 years 4,427.532
SB-912-041UL
to 1500h
4,429.714
SB-912-041UL
to 1500h
1200h / 12 years 4,418.104
1200h / 15 years 4,152.667
4,404.717

SB-912-041UL
to 1500h
1500h / 12 years 4,427.533 4,429.715
1500h / 15 years 4,404.718

Example:
You have an 912 ULS engine with a serial number of 4,427.116. In the 912 ULS column, you’ll notice that the serial numbers which are inferior or equal to 4,427.532 have a TBO of 1200h / 10 years. You will also notice that the TBO can be increased to 1500h when the instructions contained in service document SB-912-041UL are followed. You can find these service documents on

  • These informations and much more can be found in our Engine Maintenance Logs.
  • Entrust your maintenance and overhauls to Aero Propulsion Technologies