Here is another one I wanted to mention: AC 90-94.

"Guidelines for Using GPS Equipment for IFR En Route &
Terminal Operations & for Nonprecision Instrument Approaches
(12/14/94) (AFS-820)"

You can find it here, if you're an AOPA member:

http://www.aopa.org/members/files/ac/ac90-94.pdf

On 11/18/2005 4:41 PM, Mark Hansen wrote:

On 11/18/2005 3:43 PM, tom pettit tompetatpeak wrote:
I don't currently have any navigation equipment. I was hoping that a
single, certified, gps unit could be used as primary, with an uncertified
unit as back up. I was hoping I didn't need anything else. Reading the
FARS it isn't very specific, or more likely, I just don't know enough about
this stuff yet.
thanks,
tom

Well, start with FAR 91.205. Specifically, 91.205 (d), and
91.205 (d) (2), where it state:

"...navigational equipment appropriate to the ground
facilities to be used".

Then, have a look at the AIM, in the section on Navigational Aids (section
1), specifically, 1-1-19 (d) (1), which talks about Authorization to conduct
any GPS operation under IFR, and later it talks about the requirements
for alternate navigation equipment.


Basically, what this all boils down to, is this: If you have a
IFR-certified GPS system (TSO-129 certified), like the Garmin
GNS 430, you can use it for IFR operations, but the plane needs
to be equipped with the typical IFR navigation radios anyway.

There are some exceptions, but this should get you thinking in the
right direction. I would expect that the GPS systems that can be
used without any other nav equipment on board would be more expensive
than a TSO-129 system + standard nav gear anyway.

I hope this helps,


"Mark Hansen" wrote in message
...
On 11/18/2005 13:28, tom pettit tompetatpeak wrote:

I'm currently flying VFR in a vfr equipped plane. What would be the
lowest cost GPS based instrument system I could install and be legal for
IFR flying?

I looked through the last six months of this newsgroup, but didn't see a
FAQ or the answer to the above, so I hope it won't be something that was
just hashed out.

thanks,
tom pettit

Keep in mind that it takes a specific unit (a TSO one forty something
rather than the TSO 129... I'm not sure I have those number correct) for
the GPS unit to be used as the sole means of IFR navigation.

I mention this, because you said your plane is not currently IFR
capable. In order to use one of the TSO 129 certified GPS units for
IFR flight, the plane must still have the navigation equipment on
board for the ground based navigation aids along the route of flight.

Does any of this apply to you?

If not, sorry if I misunderstood your situation.


--
Mark Hansen, PP-ASEL, Instrument Airplane
Sacramento, CA






--
Mark Hansen, PP-ASEL, Instrument Airplane
Sacramento, CA