Aircraft Design & Certification
Tomark SD-4 LSA

Viper SD-4

  • CS-LSA type certification
  • Rotax 912 engine / Neuform fix pitch propeller

AD&C involvement:

  • EASA Type Certification Process (cert. program)
  • Loads
  • Structure and System Testing
  • Flight Test 

The project:

Tomark s.r.o. is company located in Presov a city in the east of the Republic of Slowakia.

The company applied for a CS-LSA approval of their very successful microlight/homebuilt aircraft Viper SD-4. The design is of rugged aluminum sheet metal and features simple piloting, exclusiv interieur and astonishing price / performance ratio.

AD&C has successfully guided the engineering team thru the ELA1 process towards the EASA type certification approval on 22nd March 2016. The aim of this cooperation is the development of type certified product, a trained team at Tomark and a qualified company with reliable production and spare part supply.

You can find the EASA Type Certificate here: pdfEASA.A.606 Viper SD-4_issue2.pdf339.84 kB

The tasks of AD&C within this project are primarily:

  • Coordination with EASA
  • Guidance for adaption of the design to comply with the certification basis
  • Loads, sizing and analysis of structural strength and stiffness wher needed
  • Testing of strucutre and systems
  • Flight Test
  • Support of compilation of required substantiation documentation
  • Support in continued airworthiness matters

SD-4 LSA Gallery


From Concept

to Certification.

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