Regulation (EU) 2020/270

All of the following constitutes the complex maintenance tasks which, according to Appendix II, shall not be carried out by the pilot-owner. Those tasks shall be released either by an approved maintenance organisation or by independent certifying staff:

1. the modification, repair or replacement by riveting, bonding, laminating, or welding of any of the following airframe parts:
   1. (1)a box beam;
   2. a wing stringer or chord member;
   3. a spar;
   4. a spar flange;
   5. a member of a truss type beam;
   6. the web of a beam;
   7. a keel or chine member of a flying boat hull or a float;
   8. a corrugated sheet compression member in a wing or tail surface;
   9. a wing main rib;
   10. a wing or tail surface brace strut;
   11. an engine mount;
   12. a fuselage longeron or frame;
   13. a member of a side truss, horizontal truss or bulkhead;
   14. a seat support brace or bracket;
   15. a seat rail replacement;
   16. a landing-gear strut or brace strut;
   17. an axle;
   18. a wheel; and
   19. a ski or ski pedestal, excluding the replacement of a low-friction coating;
2. the modification or repair of any of the following parts:
   1. aircraft skin or the skin of an aircraft float if the work requires the use of a support, jig or fixture;
   2. aircraft skin that is subject to pressurisation loads if the damage to the skin measures more than 15 cm (6 in.) in any direction;
   3. a load-bearing part of a control system, including a control column, pedal, shaft, quadrant, bell crank, torque tube, control horn and forged or cast bracket, but excluding:
      1. the swaging of a repair splice or cable fitting; and
      2. the replacement of a push-pull tube end fitting that is attached by riveting;
   4. any other structure not listed in point (a) that a manufacturer has identified as primary structure in their maintenance manual, structural repair manual or instructions for continuing airworthiness;
      1. dismantling and subsequent reassembling of a piston engine other than:
         1. to obtain access to the piston/cylinder assemblies; or
         2. to remove the rear accessory cover to inspect and/or replace oil pump assemblies, where such work does not involve the removal and refitment of internal gears;
      2. dismantling and subsequent reassembling of reduction gears;
      3. welding and brazing of joints, other-than-minor weld repairs to exhaust units carried out by a suitably approved or authorised welder but excluding component replacement;
      4. the disturbing of individual parts of units which are supplied as bench-tested units except for the replacement or adjustment of items normally replaceable or adjustable in service;
   5. the balancing of a propeller, except:
      1. for the certification of static balancing where required by the maintenance manual; and
      2. dynamic balancing on installed propellers using electronic balancing equipment where permitted by the maintenance manual or other approved airworthiness data;
   6. any additional task that requires:
      1. specialised tooling, equipment or facilities; or
      2. significant coordination procedures because of the extensive duration of the tasks and the involvement of several persons.

→ Appendix IV