© 2018 Avco Corporation. All Rights Reserved
Appendix D
November 2018
Page 519
TEO-540-C1A Engine Maintenance Manual
Fault ID
441
Fault Group
56
Fault Name
[FAULT: NTO lamp output failure]
Fault
Description
Primary: NTO Lamp Output Failure
Secondary: -reserved-
Fault Lamp
None
Root Cause
This fault indicates a failure of the NTO lamp output on the primary channel
Troubleshooting Steps
1.
If annunciator uses an incandescent bulb, go to step 2. If annunciator uses an LED bulb, go to step 4.
2.
Replace bulb. Does fault become inactive. If yes, go to step 3. If no, go to step 4.
3.
Clear Service faults using the FST by following the steps outlined in the “Access the Field Service Tool”
section in Appendix C or the latest revision of
SSP-118.
4.
Remove connector/wires from annunciator. Complete continuity/short circuit test on annunciator assembly,
using a multi-meter and aircraft wiring manual. If annunciator is defective, replace. If annunciator passes
tests, go to step 5.
5.
Complete a continuity test of the harness from the annunciator to the ECU connector using the engine system
schematic in Appendix B and aircraft wiring diagram manual. If the continuity check fails, isolate to affected
harness by disconnecting AF-P1. If engine airframe harness is at fault, contact Lycoming Engines. If aircraft
wiring is at fault, repair in accordance with aircraft maintenance manual. If the continuity checks good,
replace the annunciator. If fault persists, replace the ECU.
Fault ID
442
Fault Group
56
Fault Name
[FAULT: PFT lamp output failure]
Fault
Description
PFT lamp output driver failure fault
Fault Lamp
None
Root Cause
This fault indicates a Pre-Flight Test lamp output failure
Troubleshooting Steps
1.
If annunciator uses an incandescent bulb, go to step 2. If annunciator uses an LED bulb, go to step 4.
2.
Replace the bulb. Does fault become inactive. If yes, go to step 3. If no, go to step 4.
3.
Clear Service faults using the FST by following the steps outlined in the “Access the Field Service Tool”
section in Appendix C or the latest revision of
SSP-118.
4.
Remove connector/wires from annunciator. Complete continuity/short circuit test on annunciator assembly,
using a multi-meter and aircraft wiring manual. If annunciator is defective, replace. If annunciator passes
tests, go to step 5.
5.
Complete a continuity test of the harness from the annunciator to the ECU connector using the engine system
schematic in Appendix B and aircraft wiring diagram manual. If the continuity check fails, isolate to affected
harness by disconnecting AF-P1. If engine airframe harness is at fault, contact Lycoming Engines. If aircraft
wiring is at fault, repair in accordance with aircraft maintenance manual. If the continuity checks good,
replace annunciator. If fault persists, replace the ECU.
Fault ID
443
Fault Group
56
Fault Name
[FAULT: FFL lamp output failure]
Fault
Description
Fault Found Lamp output failure driver
fault
Fault Lamp
None
Root Cause
This fault indicates a fault found lamp output failure has been consistently detected.
Troubleshooting Steps
1.
If annunciator uses an incandescent bulb, go to step 2. If annunciator uses an LED bulb, go to step 4.
2.
Replace the bulb. Does fault become inactive. If yes, go to step 3. If no, go to step 4.
3.
Clear Service faults using the FST by following the steps outlined in the “Access the Field Service Tool”
section in Appendix C or the latest revision of
SSP-118.
4.
Remove connector/wires from annunciator. Complete continuity/short circuit test on annunciator assembly,
using a multi-meter and aircraft wiring manual. If annunciator is defective, replace. If annunciator passes
tests, go to step 5.
5.
Complete a continuity test of the harness from the annunciator to the ECU connector using the engine system
schematic in Appendix B and aircraft wiring diagram manual. If the continuity check fails, isolate to affected
harness by disconnecting AF-P1. If engine airframe harness is at fault, contact Lycoming Engines. If aircraft
wiring is at fault, repair in accordance with aircraft maintenance manual. If the continuity checks good,
replace annunciator. If fault persists, replace the ECU.
