This was discovered on an aircraft during a condition inspection. It really was a poor installation. Nonetheless, the aircraft had been operating on unfiltered air for quite some time. It’s not the first time I have seen this. It is quite easy to check during a preflight by using a flashlight and peering up into the lower cowling from the exhaust exit.
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Shopmaster Shop TalkDear Bob Fritz: I have the opportunity to purchase a Shopmaster Lathe/Mill...
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How you choose might depend on panel space and your control set preference—but the choices are extensive!