Ever wonder why the standby alternator or vacuum pump isn’t working? There is a drive coupling that is designed to break if something becomes stuck. They are also supposed to be replaced every 500 hours or they can start looking like this!
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Editor-in-Chief Marc Cook takes note of the good, bad and the uncapitalized in public reactions to a recent aircraft accident. He encourages knowledgeable pilots, builders and enthusiasts to counter the public rantings of armchair crackpots with kindness and courage. Also, a tip of the buttonless cap to Omar Filipovic, KITPLANES.coms new webmaster, for his savvy work to create a more lively and flexible web site.
last time I looked, the vacuum pump drive spool had a 500hr OR 10 year service life whichever comes first.
Perhaps this is newer data than when you last looked, butTempest has a service letter, SL-001 which recommends replacement every 6 years.
In our glass cockpits the standby alternaotr seems pretty important. That’s why we recommend 5 years.
Vic
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