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Around the Patch

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Have you checked your fuel system for leaks lately? Turns out there's a good reason to periodically conduct a thorough investigation. Incipient leaks may go undetected. Worse, when the O-ring on the fuel-selector valve goes bad, it could allow air into the system, which means your engine could misbehave at a most inconvenient time. Often, this malady is difficult to diagnose and the assumption is that the fuel selector is OK when it is not.

Flight Testing: Finding TAS from GPS Data

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Math works! Kevin Horton shows you how to use GPS data to calculate true airspeed.

Firewall Layout

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The chess game.

Flush Rivet Removal

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There can be more than 10,000 rivets in an aluminum kit aircraft. Given that many opportunities for errors, you’ll surely need to replace a few.