Thanks, that helped me chase down the difference. Thought my filter-fu was messed up. :-)
Assuming you used this site...
https://registry.faa.gov/aircraftinq...f_Inquiry.aspx
... it works by model code, not N-Number. This tells one how many aircraft of a given type *have* been licensed at one point, but does not address whether they're currently in the FAA registry.
If you cross-reference the model codes to the N-Number list, 32 of those Tailwinds have had their registrations canceled. My search using the downloaded database was only for active registrations (though, obviously, I do maintain a list of de-registered aircraft as well).
Here's the list of de-registered W10s.
N-NUMBER Dereg year MFR MODEL YEAR-MFR MFR-MDL-CODE SERIAL-NUMBER17PV 2009 STRUBLE MATT W-10 1996 056017O 969598 2013 BRUSE EVERT HUBERT TAILWIND W8MW10 0560250 589320WT 2011 ALLEY BRIAN K W-10 TAILWIND 1997 056033J 940622TW 2005 GRIFFITH THOMAS W WITTMAN TAILWND W-10 05603PD 622270RS 2013 STEBER RONALD J WITTMAN TLWND W-10 056048K DR2512DT 2013 TRAUGER DAVID J WITTMAN TLWIND W-10 1999 056049C DR11210U 2015 CHENEY HAROLD A TAILWIND W-10 05604BS 9796246D 1997 LOUCKS GARY D TAIL WIND W-10 05604CR 11561194K 2000 DURRWACHTER JOHN C WITTMAN TAILWND W-10 05604PD 10517079N 2000 MCCLANAHAN HOMER W WHITMAN TAILWND W-10 05605FZ 1181173RS 2001 BEAN ROBERT E WITTMAN TAILWIND W10 05605S6 001032028RS101XN 2013 KENNEDY FRANCIS M WITTMAN/KENNEDY MW10 0560684 9538470X 2001 FREUND FRIEDRICH W WITTMAN TAILWIND W10 05607QZ 1178543CL 2002 MCCOY ROBERT S W10 TAILWIND 05611T9 01-11869XU 2006 SNAVELY GLENN E WITTMAN TAILWIN-W-10 05612G0 1488WB 2010 BYRD JOHN MCINTOSH WITTMAN W-10 05613OF 11954031X 2008 MORPHEW BEN WITTMAN W-10 056140J 54540WB 2009 BERNARD WILLIAM R JR TAILWIND W-10 2004 056158M 98-1100688CS 2009 STEWART WILLIAM L WITTMAN TAILWIND W10 2006 05621MD 1001547S 2005 WHITLOCK DONALD C TAILWIND W-10 05626J3 719865JT 2018 WING JOHN R WITTMAN TAILWIND W10 2011 05631AW 001211TW 2018 ROBERT C CROFT / RALPH G CROFT WITTMAN W10 TAILWIND 05633CQ 99-113079BT TANNER-BILL WITTMAN TAILWIND W10 9790506 46149BT 2001 TANNER BOB J. WITTMAN TAILWIND W10 9790507 49BT9054R 2018 COUGHLIN JERRY E W-10 TAILWIND 1981 9790509 43862JE 2013 EVANS JAMES H WITTMAN TAILWIND W10 9790514 448625JS 2019 SHIVER JAMES H TAILWIND W-10 1986 9790517 JS 4668175G 2018 CLEMENT JAMES L WITTMAN W-10 1989 9790525 43638CW 2001 WOOD CALLBIE FRANKLIN JR WITTMAN W-10 9790526 65190TS 2005 SMITH TAYLOR WITTMANW-10 1990 9790527 587557CL 2017 ROE CLEO WITTMAN TAILWIND W10 1992 9790531 557
Ron Wanttaja