Lycoming TEO-540-C1A Maintenance Manual page 549

TEO-540-C1A Engine Maintenance Manual
Fault ID 441
Fault Primary: NTO Lamp Output Failure
Description Secondary: -reserved-
Root Cause This fault indicates a failure of the NTO lamp output on the primary channel
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
PFT lamp output driver failure fault
Description
Root Cause This fault indicates a Pre-Flight Test lamp output failure
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 Fault Found Lamp output failure driver
Description fault
Root Cause This fault indicates a fault found lamp output failure has been consistently detected.
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.
© 2018 Avco Corporation. All Rights Reserved
November 2018
Fault Group 56
Troubleshooting Steps
Fault Group 56
Troubleshooting Steps
Fault Group 56
Troubleshooting Steps
Fault Name [FAULT: NTO lamp output failure]
Fault Lamp
Fault Name
[FAULT: PFT lamp output failure]
Fault Lamp
Fault Name
[FAULT: FFL lamp output failure]
Fault Lamp
None
None
None
Appendix D
Page 519