On May 2, 3:29 am, Bob Noel
wrote:
In article , Ron Natalie wrote:
Doesn't this also bring up the question of when is an overhaul due
(according to hours)?
At 2000 hobbs hours or 2000 tach hours?
Lou

Tach

BZZT Wrong answer. Time in service. Tach is acceptable,
so are elapsed time meters. I don't even have a recording
tach in my plane.

argh, I knew better than that too.

In Canada, at least, the time used for such things as engines
is Air Time, described in the regs like this:

"air time" - means, with respect to keeping technical records, the
time from the moment an aircraft leaves the surface until it comes
into contact with the surface at the next point of landing.

Technical records include engine logs. So a tach could be way
off if you spend a lot of time taxying or running up or doing other
non-flying stuff.

Dan