klehman(at)albedo.net
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 Posted: Sun Feb 25, 2007 6:36 am Post subject: Engine monitoring, was Magneto failure in general, Was: P Ma |
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It is indeed valuable to get immediate notification of a parameter that
is out of limits. However those limits have to be broad enough to avoid
nuisance warnings. One improvement is that I can program my EIS with a
minimum in flight oil pressure separately from minimum on the ground or
at idle. However I have traded away the ability to visualize a normal
range (or mark what is normal in cruise) on an analog gauge which I find
easier than trying to remember a digital number. I consider that a good
trade but for me there is some value in both digital and analog indications.
It seems to me that the next step is software that builds a record of
normal parameters and then compares the present readings to the long
term norms so that it can automatically flag a subtle trend that may
indicate future problems. An example might be comparing present oil
pressure to a table or graph of what it has been at that rpm and
temperature for the last 50 hours and also to the manufacturers absolute
limit. A slight falling trend might indicate oil contamination, plugged
filter, degrading sensor, or something more serious that I would not
notice without automatic recording and automatic comparisons by the
software. A few guys do something similar by downloading info
continuously to a laptop and checking it after the flight.
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