Ascend by Cirium does not ever go back and change our values with the intent to obscure or change
what our underlying value opinion was at that previous point in time. All of the historical value opinions
stored in our values database are our recorded value opinions as-at the indicated historical point in
There are some exceptions:
• In rare cases, we have restated our baseline specification for a value subseries, which means
that the historical values for that value sub series must be recalculated to the updated baseline
spec assumption. This restatement was done using our historical spec adjustments that were
in place at those historical points in time, and then our historical spec adjusters are also
recalculated in reference to the updated baseline specification. The end result is that our
historical value for a specific aircraft of a specific given specification remained the same, but
the generic historical value does change because it now reflects a different assumed
The following is a list of commercial aircraft for which we made such baseline
spec adjustments over the years:
o We split our Airbus A320ceo into the older ones (with 5A/A1 engines built from 1988
to 2003) and younger ones (with 5B/A5 engines, built from 1993 onwards)
o We split our Airbus A330-300 into the older ones (with low weight built from 1992 to
1998) and younger ones (with high weight, built from 1999 onwards)
o We merged 12 variants of Embraer E-Jets into 4 because the other 8 variants were
just versions of the 4 variants with different baseline MTOWs.
o We restated our baseline engine assumption for the 787 family from RR Trent 1000 to
GE GEnx engines.
o We restated our baseline engine assumption for the A319ceo from CFM56-5A engines
to IAE V2522-A5
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