peter(at)sportingaero.com
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 Posted: Sun Sep 17, 2006 5:06 am Post subject: Systems Testing (was Fuel Pump Switch(es)) |
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Try writing down a list of things your fuel system must do. Write simple
statements and start with the basics - transfer fuel from the tank to
the carb/injector fuel inlet at xx pressure. Write only one 'feature'
per statement. Think about what you want to happen in unusual situations
or when components fail. Try not to think about your design. You are
creating a set of "Requirements". Include details - must be able to get
at fuel filter easily for servicing - as well as whole system issues -
system must only need servicing yearly. Define words like 'easily'.
There are now two parallel paths to follow. 1) Look at your design to
ensure you have met all of the requirements - be critical (not always
easy). If the design does not meet the requirements then change the
design.
2) Develop a verification or test for each requirement. If a ground test
is too difficult you will now understand any risks you are taking - for
example you may decide to trust the pressure gauge manufacturer's
calibration (most people do). Minimize flight testing, its risky and
getting good data is more difficult than you think. The best way is to
get someone other than the designer to write the tests (your wife may
be?), but that's not always possible.
Be honest with yourself when testing. A second pair of eyes often helps.
Try to keep it all simple.
Yours, Pete
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