What you see in the Full Panel image is the final configuration before I sold
When I bought the aircraft in 1990 it came with a standard six-pack, and HSI,
which was relocated and is now shown on the Full Panel image behind the pilot's
yoke. A Century II autopilot and a PSS 60 altitude hold is shown at the bottom
of the center panel. The radio stack contained an audio panel, two Mark 12Ds,
ADF (low row left on the floating panel, a transponder and a Foster loran.
On the right canted panel was an Alcor EGT and a fuel flow computer. Quite a
well equipped aircraft when purchased. I was the third owner.
In the early 1990s I added the Stormscope (1992), the Sandel and a PS1000
(1991) intercom. With the addition of the Sandel the existing HSI was moved to
the lower panel below the floating panel. I also added a CHT gauge to the cant
Because the Sandel CRT stroke display depended on a bulb, switching was also
designed and installed to allow the Century II to drive either the Sandel or the
NSD360 HSI for redundancy in case the Sandel bulb blew. It never happened but...
And then came GPS.
In May of 2002 one of the radios was removed and a Garmin GNS-430 installed
and was later upgraded to WAAS in Nov 2007. With the GNS-430 WAAS upgrade the
EATON annunciators were installed. Total cost of the annunciators as installed
was just under $2k.
For redundancy the system was upgraded with an Eaton annunciator illuminated
switch. The switch allowed either the Sandel, as HSI-1, or the non-slaved
NSD-360 driven by the Mark 12D or the Foster LRN-500 (Loran) were selectable as
HSI-2 to drive the Century II autopilot. This switch is shown in the Upper Panel
& Annunciators image as AP Select. Look carefully and you can see the HSI1 and
HSI2 illuminated legends.
In about 2007 the FAA required that various annunciator indications be within
a specific distance of the GPS in line of site of the pilot. There were a number
of outfits that were providing `boxes' for a bit North of $2k+ for just the
required indications. I did not like the looks of them nor the design. Todd
Adams of Lancaster Avionics at Lancaster Airport in PA suggested the EATON
I also did not like the fact that various older `annunciator' lights were
scattered all over the panel.
In November 2007 the Loran was replaced with a GNS 400W/500W WAAS again for
redundancy. The ability to switch between HSI-1 (GNS-430W) and HSI-2 (GNS
400W/Mark12D) was retained. Four additional Eaton annunciators, two for each GNS,
were installed to provide display of MSG, WPT, APR, INT, VLOC, GPS, OBS, TERM.
These are labeled GPS 1 and GPS 2 in the Upper Panel & Annunciators and
Intermediate Upgrade images. Four legends are displayed in each annunciator. You
can see GPS displays best in the Intermediate Upgrade image.
At the same time, various other indicators, as shown in the right hand row of
four annunciators, were added. A remote GEAR UP/GEAR DN indicator is shown at
A GYRO/ALT OUT warning is next. Both of these are push to test. The third is
an OIL P/CHT warning. The last one is a dummy installed as a `Spare'. It's
really just the head.
The Eaton annunciators are best acquired customized. As mentioned above, they
can have up to four legends when used as simple indicators. They are also
available as toggle switches, with or without push to test.
The Eaton annunciators are best acquired through a distributor. Let the
distributor know what you want and let them deal with Eaton. A suggested
Associated Aircraft Supply
3250 Stone Myers Pkwy, Grapevine, TX 76051
1-800-369 3212, 214-331-4381
You can also contact
KLAN in PA
"I see no real downside to vacuum/pressure driven analog gauges provided you
have a decent backup pump. Installed, the backup pump is about the cost of a G5
Electronics quits the same as anything else."
David F. Rogers, PhD, ATP
Professor of Aerospace Engineering (Emeritus)
"Pilots know how TO fly airplanes.
Aeronautical Engineers know HOW airplanes fly.
Seldom do the twain meet."