Electronics International US-8A - Manual (Page 22)

18.5
6. Before starting the installation make sure the unit will fit in the location you intend to install it without
obstructing the operation of any controls.
7. If this instrument is to replace an existing unit in the aircraft, it is the installer's responsibility to move or
replace any existing instruments or components in accordance with FAA approved methods and proce-
dures. The following Installation Instructions do not cover moving or the removal of any existing instru-
ments or components.
2. CHT Probe Installation:
A single CHT probe should be placed on the hottest cylinder. In a 6-cylinder engine this would be one of the
center cylinders. On a 4-cylinder engine this would be one of the back cylinders.
If a second CHT probe is to be installed it should be placed on one of the front unobstructed cylinders. This
will allow the US-8A to detect shock-cooling automatically.
Most engines have a port just below the lower spark plug for the CHT probe. If your engine has a primary
CHT probe in one of the cylinders, do not remove it. The US-8A is not STC'd as a primary replacement
instrument. Select another cylinder for your probe. If you’re putting a CHT probe on every cylinder use our
P-102 Gasket CHT Probe for your primary cylinder.
Installation Instructions 1. Important Information and Initial Check Out