FAA Approved Installation Manual for the EDM-960 system
Report No 909
Primary Engine Data Management System
Page 14 of 45 Rev C
Date 12-12-12
14. Turbine Inlet Temperature (TIT) Probe Installation (optional)
Use the J1 connector harness 790200 and insert the yellow wire into the connector pin 16 and the red wire into pin
17. The standard TIT probe PN M111-T with a #48 clamp is placed in the exhaust stack accumulator to a maximum
depth of 1/2 inch and approximately 4 inches from the turbine inlet if possible, on the waste-gate side of the turbine.
14.1 Using the Factory original TIT Probe
The factory installed TIT probe (K-calibration) is compatible with the JPI EDM-960 System. Connect the JPI wire
marked TIT. Replacement probes should be purchased per part number from the aircraft manufacturer.
The EDM-960 permits you to remove the factory installed TIT indicator and leave the TIT probe installed. Connect
the JPI wire marked TIT directly to the probe noting color polarity. The TIT probe should now have only the JPI
leads attached to it. No calibration of the EDM-960 is necessary.
15. Cylinder Head Temperature (CHT) Probe Installation
Use the J2 connector harness 700700 or 700702 labeled C1 through C4 or C6. The JPI probe is a bayonet probe
P/N 5050-T that has a captive 3/8-24 boss that is screwed into the head of each cylinder.
For Indicator replacement, replace your existing CHT probe and adapter, a bayonet or screw in type with one
supplied by JPI. Install the probe on the same cylinder from which you removed the original equipment probe. Your
current CHT probe is installed in the hottest cylinder as determined by the airframe manufacturer.
RADIAL ENGINE (CHT) SPARK PLUG GASKET
The spark plug gasket probe, P/N M-113, replaces the standard copper spark plug gasket on one spark plug. The
probe is usually placed on the Rear plugs. After many removals the probe may be annealed for re-use. Heat to
1100
o
F and quench in water.
16. Outside Air Temperature (OAT) Probe Installation
Connect the OAT probe to the
LEFT ENGINE DAU J1 connector
harness 790200 labeled OAT. All
wiring must be type K
thermocouple wire. Do not splice
ordinary copper wire in any
temperature probe circuits.
Install the OAT probe, PN 400510
in the airframe manufacturer’s recommended location. If this information is not available, place the OAT probe in
clean airflow such as in a cabin air scoop or below the underside of the wing away from engine heat or exhaust. In
this case it is recommended that the installation be done similar to the antenna installation. The outside aluminum
shield tube is used to both hold the probe in place and shield it from radiated heat from the sun it can be replaced
with a 5/16 nut. The OAT option is typically displayed as digital gauge and has no associated alarms.
17. Compressor Discharge Temp Probe Installation (optional)
Use the J1 connector harness 790200 and insert the yellow wire into the connector pin 3 and the red wire into pin
4. All wiring must be type K thermocouple wire. The Induction Air Temperature probe, (IAT), is installed just after
the inter-cooler and the Compressor Discharge Temperature (CDT) just before the inter-cooler. The probe is the
same as an EGT probe and installed similarly to an EGT probe. A large clamp is supplied to fit around the air duct
leaving the inter-cooler. Alternately a 1/8 NPT fitting is available. IAT option is displayed as an independent digital
temperature like "125 IAT". On non-turbo engines the IAT in reality is the Carburetor temperature and displayed as
“34 CRB.”
washer
aircraft sheet metal
washer
probe
shield tube
used to secure
probe
