On Sun, 08 Feb 2004 17:43:43 -0600, "O. Sami Saydjari"
wrote:

As I reading through my aircraft logs, I noticed several replacements of
the Directional Gyro and Turn Coordinator. The plane is a 1978 Piper
Turbo Arrow 3. Is is normal to need to replace these things every 4-5
years?

I have an 2002 SR20 and my TC was replaced after 10 months, my
directional gyro (Sandel EHSI) lasted 1 year and 9 months.