Hour Exhaust System Inspection - Lycoming TEO-540-C1A Maintenance Manual

2. 50-Hour Exhaust System Inspection

NOTICE: Complete this inspection after every 50 hours of engine operation.
A. Examine the transition (Figure 3) and its gaskets and clamps as well as the slip joints (Figure
4) for cracks, and poor or loose fittings. Identify and correct any problems. Replace any
damaged, leaky gaskets.
NOTICE: Cracks can be caused by excessively high Exhaust Gas Temperature (EGT) or
Turbine Inlet Temperature (TIT). Identify the cause of high EGT or TIT temperature
if suspected. Exhaust gas temperature and turbine inlet temperature must not exceed
the maximum temperature limit during operation per Appendix A in the TEO-540-
C1A Engine Installation and Operation Manual.
B. Look for leaks in exhaust system connections and exhaust ports of cylinders. If exhaust
system leaks are suspected, look for paint burned off around spark plugs and exhaust flange
bosses. Also, look for light gray deposits on surfaces near the leak.
C. Examine the exhaust system for a powdery white to light brown or black residue which is
evidence of exhaust gas leakage. Identify and correct the cause of the leakage.
D. Torque any loosened gasketed flange assemblies in accordance with the Standard Torque
Tables in the latest revision of the Service Table of Limits - SSP-1776. Complete a check if
this tightening stopped the leak.
E. Look for loose heat shields. Tighten fasteners on loose heat shields.
F. Examine the exhaust manifolds for visible damage such as bulging, cracks, dents, residue and
overall general condition. Identify and correct all of the causes in accordance with the
airframe or exhaust manufacturer's procedures.
3. 100-Hour Exhaust System Inspection
NOTICE: Complete this inspection after every 100 hours of engine operation (or during the
annual inspection).
A. Examine hardware torque on exhaust flange assemblies.
B. Examine the exhaust system gaskets (Figure 3) for damage. Replace a damaged exhaust
system gasket.
4. 250-Hour Exhaust System Inspection
NOTICE: Complete this inspection every 250 hours or annually (the first that is applicable).
CAUTION ALL OF THE FLANGE SURFACES MUST BE ACCURATELY ALIGNED. IF
CROSSOVER EXHAUST COMPONENTS ARE INCORRECTLY ALIGNED,
THEY CAN CAUSE TOO MUCH STRESS TO THE FLANGES OF THE
CROSSOVER EXHAUST PIPES (FIGURE 3). THIS MISALIGNMENT ALSO
CAN CAUSE GAS LEAKAGE AT THE SLIP JOINTS OF THE
INTERMEDIATE CROSSOVER PIPE AND FLANGE JOINTS OF THE LEFT
AND RIGHT CROSSOVER PIPES.
A. Mark the exhaust pipe in accordance with Figure 2. You will use the marks to measure the
slip joint engagement.
B. Examine the flange joint at the transition inlet for deformation and/or cracks.
C. Examine the exhaust pipe and attachments (Figure 3) for cracks.
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Page 344
TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
© 2018 Avco Corporation. All Rights Reserved
November 2018