Maintenance and Adjustments
Teledyne Continental Motors, Inc.
TM
9-4
IOF-240 Series Engine Maintenance Manual
29 November 2006
9-1.1. Ground Strap Connection Point Cleaning
The integrity of electrical ground is important to the ability of the FADEC System to
tolerate electromagnetic interference and lightning transients. Two ground straps,
shown in Figure 9-1, are installed on the Electronic Control Unit (ECU). Ground straps
are also installed between the engine and airframe. This procedure applies to any
ground strap connection on this engine.
CAUTION: The security and cleanliness of all ground straps,
electrical connectors, electrical terminals and shields is absolutely
necessary to maintain the FADEC System’s ability to tolerate the
high levels of Electro-Magnetic Interference (EMI) and lightning
that may be experienced in the flight environment. Any ground
straps, electrical connectors, electrical terminals, and shields that
are loose, corroded, or broken must be repaired or replaced prior to
further flight operations.
Ground points
Ground straps
Ground points
Ground straps
Figure 9-1.
Ground Straps and Connection Points
1.
Remove the connection fasteners for the ground strap.
2.
Using a stiff wire brush (miniature bottle brush); clean out the bonding bolt holes in
the ECU.
3.
Using a Scotch-Brite pad, clean the contact area on the ECU.
4.
Apply Alodine to the strap contact area on the ECU and allow it to dry.
5.
Using Scotch-Brite, clean the oxides off of the ends of the ground straps.
6.
Install fasteners and torque the bolts per Appendix B in this manual to reattach the
ground strap.
7.
Perform the “Ground Strap Continuity Test” in Chapter 7 of this manual.
