Mean Time to Failure

"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 had a 25 year old Cessna 150 with what was apparently the original DG and turn
coordinator. IIRC, there was no record in the logs that either had been rebuilt
or replaced. The RC Allen DG in my Maule started drifting about a year after I
bought it, and I had it rebuilt by Ducasse. It's given me no trouble since. I
have a rebuilt turn-and-bank in the Maule, so I don't have a TC referent there.
The Maule's a '95 model.

George Patterson
Love, n.: A form of temporary insanity afflicting the young. It is curable
either by marriage or by removal of the afflicted from the circumstances
under which he incurred the condition. It is sometimes fatal, but more
often to the physician than to the patient.