Teledyne Continental Motors, Inc.
TM
Non-Overhaul Removal and Replacement
IOF-240 Series Engine Maintenance Manual
10-65
29 November 2006
8.
Secure the signal conditioner with hold-down washers, new lock washers, and nuts.
Torque the two nuts per Appendix B.
CAUTION: If the resistance measured exceeds 0.5 ohms, the
FADEC System has a ground problem. Correct the ground problem
and recheck the resistance between the SSA sensor body and
airframe electrical ground bus. Do not return the aircraft to service
until the resistance is less than 0.5 ohms.
9.
Using a DVM, measure the resistance between the SSA sensor body (accessible
between the oil sump and crankcase) and airframe electrical ground bus. Resistance
must be less than 0.5 ohms.
10.
Using a DVM, measure the resistance between one of the SSA signal conditioner 25-
pin header shells and airframe electrical ground bus. Resistance must be less than 0.5
ohms.
11.
Perform an “SSA Operational Check” to verify the unit is serviceable.
10-11.7. SSA Operational Check
Procedure
1.
Ensure the Aircraft Master Power Switch, Ignition Switch, FADEC Primary Power
Switch and Secondary Power Switch are OFF.
2.
Disconnect the high voltage harness and remove the top spark plugs from all
cylinders; see “High Voltage Harness and Spark Plug Maintenance” in Chapter 9 of
this manual for detailed removal instructions.
NOTE: The N
c
and N
e
switches enable audio associated with LED
illumination. Position all N
c
and N
e
switches closest to its
representative LED indicator to turn off audio.
3.
Disconnect both of the Engine Low Voltage Harness 25-pin connectors from the
signal conditioner. Plug the 25-pin connector of the FADEC Timing Tool (shown in
Figure 10-55) into one of the 25-pin headers on the signal conditioner.
4.
Turn the FADEC Timing Tool ON by sliding the power switch toward the top of the
tester. The power LED will illuminate to indicate power is on. The N
c
and N
e
LED
state will depend on sensor position in relation to the camshaft. LEDs are normally
ON; as the holes in the camshaft pass the sensor, the LED will extinguish
momentarily.
WARNING
Clear the arc of the propeller of personnel and obstructions to
avoid injury or equipment damage.
5.
Note the position of the propeller. Rotate the propeller in the normal running direction
(CW as viewed from cockpit) through two complete revolutions while observing the
Test Indicator LEDs. Notice the indicators switching ON and OFF as the holes in the
camshaft intersect the sensors.
