Posted for "rtitsworth" <rtitsworth@mindspring.com>:

 Scott,
 
 The 230's should have been 235's (my ignorance and a codification error).
 Thanks for the catch.  My apologies for steeling 5 CI from the 235 drivers
 :-)
 
 I also found several of the ORIGs that I had incorrectly coded as LEGACYs
 (the field promotion has been revoked) - they are returned to their rightful
 status
 
 I also found N16PH (a 320) has an FAA  AWdate in 1974 (10 years before
 Lance's first 200).  I assume it's an faa typo and should be 1994 (the
 serial # fits about there).
 
 Thanks for the registration Info.  The dates now makes more sense to me.  I
 was advised to "reserve" my N-Number, but did not understand that
 registration was an intermediate step before the DAR airworthiness
 inspections (I'm nowhere near that far along yet).
 
 My initial confusion was partly fueled buy some of the FAA registration
 dates (CERTIFICATION DATE) being well after the AW certification dates
 (AIRWORTHY DATE).  This seemed backwards.  However, I've learned these are
 perhaps caused by an aircraft being sold and/or someone changing their
 address both of which appear to trigger a change in the  registration date
 (CERTIFICATION DATE).  The AIRWORTHY DATE stays the same (of course).
 
 Assuming the FAA db is up to date and complete (it's the best we have), then
 the most conservative view is to consider planes (db records) with AIRWORTHY
 DATES as flying and all other as not-flying.
 
 I made all the above corrections to the detail list and summaries
 (attached).  I Hope I'm not unnecessarily filling folks mailboxes and/or
 choking someone's phone line (any dial-up users?).  Everyone can replace the
 earlier .xls with this (version b) copy - if you didn't just delete prior my
 rambling anyway.
 
 After the corrections and inspection of the [Summary-by-AWYear] data, it
 DOES appear as if there is a significant difference in the average age of
 the IV&IVP vs IVT fleets as was theorized by Michael Smith earlier (the data
 will set us free).  The average IV is approx 2.5 times older (IV/IVP = 5+
 years versus IVT approx 2 years).  Now to re-integrate that into the
 accident report data/analysis, guesstimate on any miles flown differences,
 and crush some numbers.  My back the envelope scribble, shows them to still
 be close, but we'll need our statistics experts to weight in (Lorn Olson are
 you out there?)
.
 Rick Titsworth
 
[Rather than fill folks' mailboxes with this file (exceeds 1/2MB) I've uploaded it to the
files area on the LML website (www.lancaironline.net/maillist.html)... you can download it
from there.  From the LML website go to the NTSB page (about 2/3 down the menubar on the
left side of the page), and look for it at the bottom.  On most systems simply right-click
the link and select the "save target as..." option in the menu that pops up and pick a place
on your computer to locate the file.

Oh yeah, one other thing... Rick, I corrected a misprint in your first paragraph... the "5"
that you stole from the 235 guys was cubic inches, not HP.  No charge for the change <g>.

    <Marv>    ]