Here are all TBO from the EC225 spec sheet
http://airbushelicoptersinc.com/imag..._data_2009.pdf
Let's go through some dates again (from oep.no)
09.12.2014 Approval of extended TBO
03.12.2015 Approval of extended TBO
so a year between those dates. The extended TBO is 100 hours.
So either inbetween 2014 and 2015 the MGB was changed. Or the AC flew
less than 100 hours.
18.12.2015 Second approval of extended TBO
Then the MGB was changed 17th of January 2016.
The changed MGB had 2300 hours.
Estimating from the 2014 date, could be MGB was changed
around January 2015 and flew 2300 hours until January 2016.
Between the 3rd and the 18th is 15 days.
And the TBO is extended with 100 hours. 100 hours - 15 days
Fits with 2300 hours a year, but is off course just speculation.
But I agree 1300 hours in 3.5 months doesn't sound realistic