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klehman(at)albedo.net
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 Posted: Fri Aug 24, 2007 5:15 am Post subject: Strobes - Light Plane Maintenance Article-capacitor life |
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Yes absolutely but...
Several people seemed to have problems shortly after first flight so I
personally did power up my strobes every 6 months prior to flying. IIRC
aeroflash did recommend that. However I'm sensitive to the issue
because I have replaced failed electrolytics in consumer electronics in
as little as 3 years from manufacture. Last week it was a little used
photocopier. Previous to that was a DVD player. One of my favorite
troubleshooting tools has become a little in circuit ESR (equivalent
series resistance) tester for capacitors. I think it was a kit from Bob
Parker for well under a $100.
Ken
Bill Maxwell wrote:
[quote]
<wrmaxwell(at)bigpond.com>
I doubt it. The message is greatly exaggerated. Electrolytic
capacitors will eventually lose their capacitor ability if left on a
shelf for a long time, but that is many years in my experience. They
rely upon being connected in circuit with a voltage across them, so an
oxide layer can form on the aluminium foil from which they are
constructed. It provides the necesary dielectric layer. However, a
capacitor which has lost that layer can be re-formed by connecting
them up andprogressively increasing the voltage to the rated working
voltage.
If the LPM article were correct, every set of strobes would need to
carry an "instal by" date. I imagine that most would have a period
between manufacture and sale of greater than 12 months.
Bill
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matronics(at)rtist.nl
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| Posted: Fri Aug 24, 2007 5:59 am Post subject: Strobes - Light Plane Maintenance Article-capacitor life |
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This could be a different issue altogether. A couple years ago an Asian
manufacturer was caught when they stole a new formula for elco's. They
happened to steal a flawed version, which caused millions of bad elco's to
be produced. They ended up in a lot of PC motherboards and other consumer
goods and they all failed after six months to a year or so . See:
http://www.geek.com/capacitor-failures-plague-motherboard-vendors/
I thought by now those should have all been weeded out, apparently not.
These failures however are not the same as ageing failures.
Rob
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