Hour Turbocharger Inspection - Lycoming TEO-540-C1A Maintenance Manual

4. 250-Hour Turbocharger Inspection

A. Complete the "50-Hour Turbocharger Inspection" in this chapter.
B. Remove the turbocharger as per instructions in the section "Turbocharger Removal" in this
chapter.
C. Examine the turbocharger. Look for nicked or bent turbine blades and any damage from
objects. If any turbine blade is nicked, bent, or damaged, replace the turbocharger.
D. Look for dirt and carbon build-up and uneven deposits on the turbine wheel. Remove any
build-up per the turbocharger manufacturer's instructions. Identify and correct the cause.
E. Examine the turbine wheels for Foreign Object Damage (FOD).
F. Turn the turbine wheel and make sure that it turns freely in the turbocharger. If the turbine
wheel does not turn freely, replace the turbocharger.
G. Examine the inside surface of the turbine housing for shiny areas on the rough exhaust
system deposits. Shiny areas are evidence that the wheel has come in contact with deposits.
Look for deposits in the turbine. Remove the deposits per the turbocharger manufacturer's
instructions, identify and correct the cause.
H. Install the turbocharger as per instructions in the "Turbocharger Installation" section in this
chapter.
5. Turbocharger Removal
CAUTION PRIOR TO TURBOCHARGER REMOVAL, LET THE ENGINE AND THE
EXHAUST SYSTEM COOL FOR 1 HOUR OR LONGER AFTER ENGINE
SHUTDOWN TO PREVENT BURNS. ENSURE THAT THE BATTERY IS
DISCONNECTED TO PREVENT ENGINE START.
A. If there is enough clearance, complete this procedure with the engine installed. Otherwise,
remove the engine from the aircraft per instructions in Chapter 72-00.
B. Remove the engine cowling.
C. Apply labels to identify the
turbocharger and attached exhaust
pipes and pieces for reference on
assembly.
D. Take photos or draw a sketch of
the exhaust system as installed and
attached to the turbocharger or
refer to Figure 1.
E. Take photos or draw a sketch of
the exhaust system as installed and
attached to the turbocharger.
Identify the locations of V-band
couplings, clamps, and adapters
with temporary labels.
F. Remove the V-band coupling from
each side of the turbocharger
(Figure 1).
G. Disconnect the turbocharger from
the exhaust transition (Figure 1).
72-40
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TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
Figure 4
Turbocharger Hoses (Right Side View)
© 2018 Avco Corporation. All Rights Reserved
November 2018