interpreting component remaining times
I'm trying to get behind helicopter TBOs and TCIs. I think I understand TBO:
If a used MRGB with a TBO of 1200h and previous usage of 200h
was installed at say 6000h
and I look at the compoment remaining life times sheet at 6600h
the remaining time is 6000 + (1200-200) - 6600 = 400h
Now I'm looking at a "Clutch" with 1200h "service life" (but stating "TCI" not "TBO") that
had a previous usage time of 1300h (well past its TCI),
was installed at 6000h
and the sheet at 6600h says:
"disassemble" at 6100h (! in the past)
"remaining time" -400h (yes, minus)
The ship is claimed to be airworthy and "has fresh 100h checks", mind you.
This either indicates that I don't understand some basic term, or the timekeeping sheet constains invalid data,
especially as I cannot come up with any arithmetic that produces these -400h remaining.
The interesting aspect is, that all other TCI items are calculated exactly liek the TBO items.
Please enlighten me, I'd like to understand these calculations.
Last edited by Reely340; 26th Jul 2017 at 09:48.