Posted for J H Webb <airmale@windstream.net>:

 Marv,
 
    I sent this on Jan 4, 2010 and it did not appear. My principle reason for
writing was that the pilot was my late wife's brother and I was very familiar
with the accident. The has been much said that is incorrect about the
accident. I talked to the accident investigator and they had to place blame.
In this case if you read the transcript of the radio calls you note some blame
should be on the FAA's side too. But with regard to the comments that Lynn
made there were some errors that I chose to point out. sometimes I get these
emails read a little late as I am 2710 emails behind but I try
 
 Lynn,
 
First
 the accident happened May 16th 2003, Not in June. Reference the
 accident in Allendale, SC the indicated airspeed was indicated as 253
 TAS in the accident report which is below Red line 274 (99% of the time
 IAS is lower than TAS) at the last data point.
 The aircraft was at 3.7Also the accident report mentions that the
 aircraft was 12 miles from a serious storm at the time of the accident,
 but in an area where a storm developed shortly after the accident.
 Things change fast in TRW's.
 
  Brent Regan wrote an
 interesting analysis of the Sierra data including the rates of change
 & presented what I felt was quite accurate estimates of the last
 moments leading up to the breakup. The aircraft did an unusual amount
 of rolling and pitching prior to the breakup.
 
    It would appear that the accident was caused mainly by high G's and
secondarily high speed (above the green line,
 below the red line) in turbulence (third factor). This high level of
 maneuvering & G's in heavy turbulence at higher speeds is not a
 safe plan.
 
 Jack Webb
 BSAE
Former Chief Engineering Test Pilot GA
 
 
>>  
>
>“On August 09, 2005 N750F,    a Lancair IV-P disintegrated in flight in a dive
>at Mach 0.62. It is not in    your list as it happened in  Canada (Transport
>Canada Report A05W0160).
>
>In June of 2003 N29ME, a Lancair IV-P, disintegrated in    flight after
>exceeding 253KTAS (274KIAS). (NTSB Report ATL03LA094)”
>
>It appears that both accident aircraft    were being flow in
> thunderstorms at the time they    disintegrated.
>Do you
>   suppose that the turbulence associated with thunderstorms may have been a
>   factor in these in-flight breakups?
>Just    wondering.
>
>Lynn    Farnsworth