Lycoming TEO-540-C1A Maintenance Manual page 523

TEO-540-C1A Engine Maintenance Manual
Fault ID 337
Fault
Power box power noise fault
Description
This fault indicates the digital input Power Box source has noise levels. The fault will
Root Cause
become inactive if the noise is reduced.
1. Gain access to engine rear accessory drive area, and inspect the following items:
•
PMA for obvious damage and security.
•
Engine harness for obvious damage and security, including harness PMA connector.
Are the PMA and engine harness secure and show no physical damage? If yes, go to step 2.
If no, complete the following for the finding:
•
PMA not secure.
o Remove PMA per the "PMA Removal" section in Chapter 73-10 and inspect PMA shaft and
gear for damage. If damage is found, replace the PMA, and inspect accessory gear drive for
damage. If no damage is found on either the PMA or accessory gear drive, reinstall PMA per
the "PMA Installation" section in Chapter 73-10.
•
PMA damaged. Replace the PMA per the "Permanent Magnet Alternator (PMA)
Replacement" section in Chapter 73-10.
•
Engine harness damaged. Contact Lycoming Engines.
2. Complete a continuity and short circuit test of the engine and engine airframe harnesses from PMA
connector to the Power Box connector using the engine system schematic. If the continuity or short
circuit check fails, isolate to affected harness by disconnecting the engine harness at the firewall
connector, then contact Lycoming Engines. If both checks pass, replace the Power Box. Is fault still
active? If yes, contact Lycoming Engines. If no, go to step 3.
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.
Fault ID 338
Fault
Description
Root Cause
Fault ID 339
Fault
Description
Root Cause
© 2018 Avco Corporation. All Rights Reserved
November 2018
Fault Group 43
Troubleshooting Steps
Fault Group 43
Troubleshooting Steps
Fault Group 43
Troubleshooting Steps
Fault Name
[FAULT: APU power source noise]
Fault Lamp
Fault Name
-Reserved-
Fault Lamp
Fault Name
-Reserved-
Fault Lamp
NTO
NTO
NTO
Appendix D
Page 493