Lycoming TEO-540-C1A, Maintenance Manual, Page: 566 / 568

Appendix D © 2018 Avco Corporation. All Rights Reserved
Page 536 November 2018
TEO-540-C1A Engine Maintenance Manual
Fault ID 552 Fault Group 70 Fault Name
[FAULT: CHT cyl 1 coss-check]
Fault
Description
CHT cyl 1 cross-check fault Fault Lamp FFL
Root Cause
This fault is a cross-check between local cylinder head temperature and inferred cylinder
head temperature has consistently exceeded its calibrated maximum threshold
Fault ID 553 Fault Group 70 Fault Name
[FAULT: CHT cyl 2 coss-check]
Fault
Description
CHT cyl 2 cross-check fault
Fault Lamp FFL
Root Cause
This fault indicates a cross-check between local cylinder head temperature and inferred
cylinder head temperature has consistently exceeded its calibrated maximum threshold
Fault ID 554 Fault Group 70 Fault Name
[FAULT: CHT cyl 3 coss-check]
Fault
Description
CHT cyl 3 cross-check fault Fault Lamp FFL
Root Cause
This fault indicates cross-check between local cylinder head temperature and inferred
cylinder head temperature has consistently exceeded its calibrated maximum threshold
Fault ID 555 Fault Group 70 Fault Name
[FAULT: CHT cyl 4 coss-check]
Fault
Description
CHT cyl 4 cross-check fault Fault Lamp FFL
Root Cause
This fault indicates the cross-check of cylinder head temperature which means a cross-
check between local cylinder head temperature and inferred cylinder head temperature has
consistently exceeded its calibrated maximum threshold
Fault ID 556 Fault Group 70 Fault Name
[FAULT: CHT cyl 5 coss-check]
Fault
Description
CHT cyl 5 cross-check fault
Fault Lamp FFL
Root Cause
This fault indicates the cross-check of cylinder head temperature which means a cross-
check between local cylinder head temperature and inferred cylinder head temperature has
consistently exceeded its calibrated maximum threshold
Fault ID 557 Fault Group 70 Fault Name
[FAULT: CHT cyl 6 coss-check]
Fault
Description
CHT cyl 6 cross-check fault Fault Lamp FFL
Root Cause
This fault indicates the cross-check of cylinder head temperature which means a cross-
check between local cylinder head temperature and inferred cylinder head temperature has
consistently exceeded its calibrated maximum threshold
Fault ID 558 Fault Group 70 Fault Name
[FAULT: CHT cyl 7 coss-check]
Fault
Description
CHT cyl 7 cross-check fault Fault Lamp FFL
Root Cause
This fault indicates the cross-check of cylinder head temperature which means a cross-
check between local cylinder head temperature and inferred cylinder head temperature has
consistently exceeded its calibrated maximum threshold
Fault ID 559 Fault Group 70 Fault Name
[FAULT: CHT cyl 8 coss-check]
Fault
Description
CHT cyl 8 cross-check fault
Fault Lamp FFL
Root Cause
This fault indicates the cross-check of cylinder head temperature which means a cross-
check between local cylinder head temperature and inferred cylinder head temperature has
consistently exceeded its calibrated maximum threshold
Troubleshooting Steps for Faults 552 thru 559
1. Run the engine in accordance with the engine and aircraft maintenance manuals. Is the fault active? *
If yes, go to step 3. If no, go to step 2.