January 2000 Issue

Letters January 2000

Tachs, PC Sims
Some notes on articles in past issues: With reference to your piece on electronic tachs in the September, 1999 issue, most owners depend on the tachometer hour meter to determine when ADs, TBO inspections and so on are due.

The Horizon tach records hours at a constant rate beginning when the engine reaches 800 RPM, thus it essentially accumulates time like a Hobbs meter. As we all know from our airplane rental experiences, the Hobbs meter accumulates time more rapidly than the tachometer hour meter, often significantly so. Thatís not good for the pocketbook because the faster running clock makes all of those pesky maintenance items come due earlier and more...

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