Installation manual

GEM INSTALLATION MANUAL DOCUMENT No. 070906 REV. 1.4
INSIGHT
INSTRUMENT CORP. 18 BOX 122, FORT ERIE, ONTARIO, L2A 5M6
Use the proper tools listed in the Tools and Materials section to crimp and insert the pins into the D-sub
connector body.
The Feature Table on page six indicates the supplementary features available for each GEM model.
The G1 GEM has no P2 connector, all connections are made through P1.
The G2, G3, and G4-001 GEM's have a 25-pin D-sub connector, refer to Drawing No. 610C-315 (Pages 1-3).
The G4-002 (twin) GEM has a 37-pin D-connector, refer to Drawing No. G4-315 (Pages 1-3).
For aircraft with existing compatible Fuel Flow sensors, use Insight P/N 610C-025 FF Signal Adapter as shown
on Drawing No. 101116 (one adapter per FF Sensor).
For twin engine aircraft equipped with two GEM's (G3 or G4-001) and a TAS-1000 Air Data Computer, refer to
Drawing No. 121210.
Checking The Installation
Verify ALL connections before applying aircraft power. Pin 15 (connector P1) is aircraft ground and pin S is
approximately +14V DC or +28V DC (See Drawing No. 1200-018).
When power is initially applied, the GEM display will illuminate to full brightness.
Immediately upon power application the GEM will display a status screen with serial number, software version
number, etc., for a few seconds. After the status screen, the GEM reverts to the main GEM bar-graph page.
EGT and CHT (and TIT) color-coded bar graph columns indicate their respective cylinder temperatures, and
supplementary values appear in cyan.
The GEM Display brightness level automatically adjusts to match the ambient light level. The automatic dimming
may be tested in bright ambient light by covering the entire face of the Display with the palm of your hand for
several seconds. The Display will dim and then brighten when your hand is removed.
In low ambient light, the auto-dimming feature may be tested by shining a flashlight on the display for several
seconds. It changes brightness slowly, in discrete steps, to prevent annoying flicker in response to rapid
ambient light level changes.
NOTE!
Do not use a LED flashlight for the brightness test! Use a flashlight with an incandescent bulb!
After the tests described above have been performed, check for possible interference with existing avionics
by listening for audio interference on Com, Nav, DME, ADF, etc. Interference is uncommon, however, these
characteristics should be tested.
If interference is detected, remove power from the Display unit to check if it is the emitter of the interference.
If the GEM series Display is the interference source, re-route the wiring harnesses away from affected
equipment. Contact Insight Product Support if needed further assistance.