Ian Strachan wrote:

Would you please explain why lack of manufacturer support has any
bearing on the security of a flight recorder or the validity of a
flight log.


In the event of an anomaly in recording or in the IGC file data, advice
from the recorder manufacturer has proved vital in the past in
explaining to the validating authority what is likely to have happened.

Several world records have been saved as a result of manufacturer advice
and tests where otherwise they would have been lost.

Sometimes the recorder has been returned to the manufacturer for tests
so that the anomaly can be explained. In at least one case, after
manufacturer tests indicated a line of investigation, further flight
tests were carried out by GFAC with that recorder and resulted in
several World Records being validated. Without this process it would
not have been.

I thought a primary reason for having a manufacturer around was for
examining the flight recorder when cheating was suspected. They should
be the best authority on whether the instrument or it's code has been
modified.

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Eric Greenwell
Washington State
USA