Time Measurement for Inspections

The tach is the instrument for measuring engine hours...
denny

"O. Sami Saydjari" wrote in message
...
OK, dumb question. For 100-hour inspections (or 50 hours until oil
change), is this measured in Hobbs time or Tach time?

-Sami
N2057M, Piper Turbo Arrow III

"Dennis O'Connor" wrote in message ...
The tach is the instrument for measuring engine hours...

Not necessarily. The FAA just wants a consistent reasonably accurate way of
recording time in service. Some aircraft, like late model Bonanza's (and now my
Navion) don't even have a recording tach (no tach time at all). We use the elapsed
time meter (hobbs).

"Ron Natalie" wrote in message
m...
Not necessarily. The FAA just wants a consistent reasonably accurate way
of
recording time in service. Some aircraft, like late model Bonanza's (and
now my
Navion) don't even have a recording tach (no tach time at all). We use
the elapsed
time meter (hobbs).

What do you consider "late model Bonanza"? Every one I've looked at (from
1987 onward until they stopped making them in 1994 has one (at least in the
F33A model).

Guessing that Hobbs time is 25% higher than Tach time, I'd put a recording
tach in if it didn't have one already.

What do you consider "late model Bonanza"? Every one I've looked at (from
1987 onward until they stopped making them in 1994 has one (at least in the
F33A model).

How about a 2003 model A36? I service a 1998 A36 and it has no recording tach
only a hobbs meter. All the engine instruments have been reduced to about 1.5"
diameter dials, no room for a tach counter.

John Dupre'

"JDupre5762" wrote in message ...
What do you consider "late model Bonanza"? Every one I've looked at (from
1987 onward until they stopped making them in 1994 has one (at least in the
F33A model).

How about a 2003 model A36? I service a 1998 A36 and it has no recording tach
only a hobbs meter. All the engine instruments have been reduced to about 1.5"
diameter dials, no room for a tach counter.

Yep, that's the ticket. My Navion now has the prop, engine, and engine instruments from
a 2003 A36. Got it with 9 hours total (just enough time to get it from Kansas down to
the conversion shop to put the turboprop on). My old tach wouldn't have worked anyhow.
It was set up for the old Gopher-35 engine which cruises at 2800 RPM. The hours on the
tach weren't the total time anyhow (not the original tach, had to add something like 4000 hours
to the value).