G1000 lost GPS for a bit

[Steven Barnes]

Just flew another 2.1 in our local Diamond Star with the G1000. Flew a
friend down to St. Louis area to pick up his daughter. On the way back, I
was putting a chart (the big book from AirChart Systems) down on the floor
between my feet. I bumped the Master/Alt switch. I looked up wondering why
the intercom died & saw 2 dark screens. Poo.
It was a beautiful (hot) day, so no problem. I turn the master back on and
in a few seconds I've got the primary display back. Radios & Nav, but no GPS
signal, and we're right under the shelf of St. Louis class B.
After a quick, but required, refresher on pilotage we cleared the St. Louis
area. We couldn't find a way to recycle just the GPS. I turned off the
Avionics switch for a few seconds. Killed everything but the primary flight
display. When I brought it back on, we had full GPS again.

Pretty weird. Only having about 4.5 hours behind a G1000, I'd hate to have
that happen IFR. Ugh.

Lesson learned? First, don't do that. Second, the quick on/off of the main
master without turning off the Avionics master apparently causing some havoc
in there somewhere. Third, always have charts handy.


--



PP-ASEL, instrument

[BTIZ]

did you find anything in the G1000 tech manual on this?

"Steven Barnes" > wrote in message
. ..
> Just flew another 2.1 in our local Diamond Star with the G1000. Flew a
> friend down to St. Louis area to pick up his daughter. On the way back, I
> was putting a chart (the big book from AirChart Systems) down on the floor
> between my feet. I bumped the Master/Alt switch. I looked up wondering why
> the intercom died & saw 2 dark screens. Poo.
> It was a beautiful (hot) day, so no problem. I turn the master back on and
> in a few seconds I've got the primary display back. Radios & Nav, but no
> GPS
> signal, and we're right under the shelf of St. Louis class B.
> After a quick, but required, refresher on pilotage we cleared the St.
> Louis
> area. We couldn't find a way to recycle just the GPS. I turned off the
> Avionics switch for a few seconds. Killed everything but the primary
> flight
> display. When I brought it back on, we had full GPS again.
>
> Pretty weird. Only having about 4.5 hours behind a G1000, I'd hate to have
> that happen IFR. Ugh.
>
> Lesson learned? First, don't do that. Second, the quick on/off of the main
> master without turning off the Avionics master apparently causing some
> havoc
> in there somewhere. Third, always have charts handy.
>
>
> --
>
>
>
> PP-ASEL, instrument
>
>

[Nathan Young]

On Sun, 24 Jul 2005 20:42:01 GMT, "Steven Barnes"
> wrote:

>Just flew another 2.1 in our local Diamond Star with the G1000. Flew a
>friend down to St. Louis area to pick up his daughter. On the way back, I
>was putting a chart (the big book from AirChart Systems) down on the floor
>between my feet. I bumped the Master/Alt switch. I looked up wondering why
>the intercom died & saw 2 dark screens. Poo.
>It was a beautiful (hot) day, so no problem. I turn the master back on and
>in a few seconds I've got the primary display back. Radios & Nav, but no GPS
>signal, and we're right under the shelf of St. Louis class B.

GPS can take some time to lock (typically << 1minute with modern
receivers). How long did you wait?

[Steven Barnes]

"Nathan Young" > wrote in message
...
> On Sun, 24 Jul 2005 20:42:01 GMT, "Steven Barnes"
> > wrote:
>
> >Just flew another 2.1 in our local Diamond Star with the G1000. Flew a
> >friend down to St. Louis area to pick up his daughter. On the way back, I
> >was putting a chart (the big book from AirChart Systems) down on the
floor
> >between my feet. I bumped the Master/Alt switch. I looked up wondering
why
> >the intercom died & saw 2 dark screens. Poo.
> >It was a beautiful (hot) day, so no problem. I turn the master back on
and
> >in a few seconds I've got the primary display back. Radios & Nav, but no
GPS
> >signal, and we're right under the shelf of St. Louis class B.
>
> GPS can take some time to lock (typically << 1minute with modern
> receivers). How long did you wait?

We flew for over 15 minutes that way. Pretty weird. I didn't get a chance to
look it up when we got back.
Tell ya what, though. Even in flight, it only took about 30 seconds (rough
estimate) before I had the AHRS back online with Comm & Nav.