912ULS TBO-Question
my question is about a 912ULS, Ser.-Nr. 4,428.330, manufactured in 2002, actually 695 h of operation.
Due to the Line Maintenance Handbook the TBO is 1.500 h or 12 years, which would mean the end of TBO in 2014.
Comparing the 2 SB ...
- SB-912-057UL (dated 2009-12-01), affecting 912 ULS from S/N 6,775.790 and in section 1) b)
“For all engine S/N lower than given a) ...." and
- SB-912-041UL (dated 2010-03-01) affecting 912 ULS from S/N 4,427.533 to S/N 6,775.789
... I can´t find out for the above mentioned motor, if we can increase the TBO to 2.000 h / 15 years or not.
SB-912-057UL mentions 15 years in chapter 1) 1.1) b), but the newer SB-912-041UL only specifies a maximum of 12 years.
What is right for Ser.Nr. 4,428.330?
Thanks for your help,
Curt