The 10 % extension comes from M.A.302. The Part-M Light includes an alleviation in that regard:
ML.A.302
(d) A MIP:
(1) shall contain the following inspection intervals:
(a) for aeroplanes, touring motor gliders (‘TMGs’) and balloons, every annual or 100-
h interval, whichever comes first, to which a tolerance of 1 month or 10 h may be
applied. The next interval shall be calculated as from the time the inspection takes
plac;
With Part-M you could go to 110h but the next inspection was required again after 100 hours. Now we can rename it as 110-hour-inspection. :)
Edit: Here’s the regulation, valid from March 24th 2020. https://www.easa.europa.eu/document-library/general-publications/erules-consolidated-regulation-eu-no-13212014-continuing
I don’t know the regulation (finding EASA regs is a whole new lifetime project 
) but an “engineer” has to approve the extension. So, the CAMO possibly? I know a fair number of people have hassle with this when doing a long trip somewhere.
Which regulation is it that allows the 10% extensions?
And if I am right, the pilot owner and its privilege has to be declared in the maintenance program to perform maintenance.
if you do have sex in it, that won’t affect the legality of you driving the car.
I can think of a few ways where it might be possible to do both.
Indeed and it still requires the owner authorization (and not the single pilot-owner) to work on the aircraft.
Don’t forget part-M MA.801(d) which is highly relevant to Peter’s question.
By derogation from point M.A.801(b), in the case of unforeseen situations, when an aircraft is grounded at a location where no approved maintenance organisation appropriately approved under this Annex or Annex II (Part-145) and no appropriate certifying staff are available, the owner may authorise any person, with no less than 3 years of appropriate maintenance experience and holding the proper qualifications, to maintain according to the standards set out in Subpart D of this Annex and release the aircraft. ….
That paragraph is applicable to all categories of aircraft.
Peter wrote:
In that case, how is pilot maintenance ever possible?
Basically, every time planned maintenance is performed :
The person responsible for aircraft airwothiness : (pick one of the two possibilities below)
sends a work order to a : (pick one of the four possibilities below)
The “aircraft owner” and “Pilot owner” can be the same person but not necessarily.
When a pilot owner sends a works order to a pilot-owner, it does not involves any company and yet maintenance is performed according to Part-M.
Before the commencement of maintenance a written work order shall be agreed between the organisation and the organisation requesting maintenance to clearly establish the maintenance to be carried out.
In that case, how is pilot maintenance ever possible?
Peter wrote:
the airworthiness of the aircraft is maintained.
No it’s not.
Commission Regulation (EU) No 1321/2014 says:
M.A.610 Maintenance work orders
Before the commencement of maintenance a written work order shall be agreed between the organisation and the organisation requesting maintenance to clearly establish the maintenance to be carried out.
