1. Wastegate Valve Not Functioning Properly

Corrective Action(s)
Engine Oil Pressure Too Low
Refer To Current Version Of The Engine Manufacturer Maintenance Manual
Actuator Linkage Binding - Correct Cause of Binding
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000
Butterfly Valve Bearings Tight (Carbon Deposits) - Clean and Lubricate with Mouse Milk
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000
Butterfly Valve Binding - Function Check Using Shop Air
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000
Butterfly Valve Stuck Open Or Closed - Verify Valve Housing Is Not Warped
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000
Inadequate Engine Oil Flow - Remove Restriction or Replace Line As Needed
Refer To Current Version Of The Engine Manufacturer Maintenance Manual
Actuator Inlet Port Obstructed - Clear Orifice or Capillary Tube In Port, Or Replace Damaged Capillary
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000

2. Controller Not Functioning Properly

Corrective Action(s)
Verify settings IAW Engine and/or Airframe POH
Refer To Current Version Of The Engine Manufacturer Maintenance Manual

3. Pressure Relief Valve Not Functioning Properly

Corrective Action(s)
Recalibrate Pressure Relief Valve
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000

1. Wastegate Valve Not Functioning Properly

Corrective Action(s)
Engine Oil Pressure Too Low
Refer To Current Version Of The Engine Manufacturer Maintenance Manual
Actuator Linkage Binding - Correct Cause of Binding
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000
Butterfly Valve Bearings Tight (Carbon Deposits) - Clean and Lubricate with Mouse Milk
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000
Butterfly Valve Binding - Function Check Using Shop Air
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000
Butterfly Valve stuck open or closed - Verify Valve Housing Is Not Warped
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000
Inadequate Engine Oil Flow - Remove Restriction or Replace Line As Needed
Refer To Current Version Of The Engine Manufacturer Maintenance Manual
Actuator Inlet Port Obstructed - Clear Orifice or Capillary Tube In Port, Or Replace Damaged Capillary
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000

2. Turbocharger Not Functioning Properly

Corrective Action(s)
Perform Visual inspection of the Compressor and Turbine wheels for Foreign Object Damage, Rubbing, and Axial / Radial Play
Refer to Current Version Of Overhaul / Maintenance Manual 400600-0000

3. Controller Not Functioning Properly

Corrective Action(s)
Recalibrate Controller Assembly
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000

4. Pressure Relief Valve Not Functioning Properly

Corrective Action(s)
Recalibrate Pressure Relief Valve
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000

1. Wastegate Valve Not Functioning Properly

Corrective Action(s)
Engine Oil Pressure Too Low
Refer To Current Version Of The Engine Manufacturer Maintenance Manual
Actuator Linkage Binding - Correct Cause of Binding
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000
Butterfly Valve Bearings Tight (Carbon Deposits) - Clean and Lubricate with Mouse Milk
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000
Butterfly Valve Binding - Function Check Using Shop Air
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000
Butterfly Valve stuck open or closed - Verify Valve Housing Is Not Warped
Refer To Current Version Of The Engine Manufacturer Maintenance Manual
Inadequate Engine Oil Flow - Remove Restriction or Replace Line As Needed
Refer To Current Version Of The Engine Manufacturer Maintenance Manual
Actuator Inlet Port Obstructed - Clear Orifice or Capillary Tube In Port, Or Replace Damaged Capillary
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000

2. Controller Not Functioning Properly

Corrective Action(s)
Verify settings IAW Engine and/or Airframe POH
Refer To Current Version Of The Engine Manufacturer Maintenance Manual
Recalibrate Controller Assembly
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000

3. Turbocharger Not Functioning Properly

Corrective Action(s)
Perform Visual inspection of the Compressor and Turbine wheels for Foreign Object Damage, Rubbing, and Axial / Radial Play
Refer to Current Version Of Overhaul / Maintenance Manual 400600-0000

4. Pressure Relief Valve Not Functioning Properly

Corrective Action(s)
Recalibrate Pressure Relief Valve
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000

1. Wastegate Valve Not Functioning Properly

Corrective Action(s)
Engine Oil Pressure Too Low
Refer To Current Version Of The Engine Manufacturer Maintenance Manual
Actuator Linkage Binding - Correct Cause of Binding
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000
Butterfly Valve Bearings Tight (Carbon Deposits) - Clean and Lubricate with Mouse Milk
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000
Butterfly Valve Binding - Function Check Using Shop Air
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000
Butterfly Valve stuck open or closed - Verify Valve Housing Is Not Warped
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000
Inadequate Engine Oil Flow - Remove Restriction or Replace Line As Needed
Refer To Current Version Of The Engine Manufacturer Maintenance Manual
Actuator Inlet Port Obstructed - Clear Orifice or Capillary Tube In Port, Or Replace Damaged Capillary
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000

2. Turbocharger Not Functioning Properly

Corrective Action(s)
Perform Visual inspection of the Compressor and Turbine wheels for Foreign Object Damage, Rubbing, and Axial / Radial Play
Refer to Current Version Of Overhaul / Maintenance Manual 400600-0000

3. Controller Not Functioning Properly

Corrective Action(s)
Verify settings IAW Engine and/or Airframe POH
Refer To Current Version Of The Engine Manufacturer Maintenance Manual
Recalibrate Controller Assembly
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000

4. Pressure Relief Valve Not Functioning Properly

Corrective Action(s)
Recalibrate Pressure Relief Valve
Refer to Current Version Of Overhaul / Maintenance Manual 400999-0000

5. Engine Intercooler Vanes Clogged

Corrective Action(s)
Visual Inspect For Improper Airflow
Refer To Current Version Of The Engine Manufacturer Maintenance Manual

1. Turbocharger Oil Leakage

Corrective Action(s)
Visual Inspect the Oil Inlet Check Valve For Proper Installation, Damage, and Clear Of Debris
Refer To Current Version Of The Engine Manufacturer Maintenance Manual Or Service Information
Pressure Check The Oil Inlet Check Valve
Refer To Current Version Of The Engine Manufacturer Maintenance Manual Or Service Information
Visual Inspect the Oil Outlet Check Valve For Proper Installation, Damage, and Clear Of Debris
Refer To Current Version Of The Engine Manufacturer Maintenance Manual Or Service Information
Pressure Check The Oil Outlet Check Valve
Refer To Current Version Of The Engine Manufacturer Maintenance Manual Or Service Information
Visual inspection the oil line installations for kinks and slope
Refer To Current Version Of The Engine Manufacturer Maintenance Manual

1. Turbocharger Oil Leakage

Corrective Action(s)
New Installation (Oil Residue)
Refer to Current Version Of Overhaul / Maintenance Manual 400600-0000
Engine Bypassing Turbine Wheel Assembly Piston Rings
Refer to Current Version Of Overhaul / Maintenance Manual 400600-0000
Failed Engine - Perform Engine Compression Check
Refer To Current Version Of The Engine Manufacturer Maintenance Manual

1. Foreign Object Damage from Air inlets, Air Filter, Alternate Air system

Corrective Action(s)
Repair, Overhaul, Replace Turbocharger
Inspect Intercooler
Borescope Engine Refer To Current Version Of The Engine Manufacturer Maintenance Manual

1. Foreign Object Damage, Failed Engine Exhaust System

Corrective Action(s)
Repair, Overhaul, Replace Turbocharger
Inspect Engine
Refer To Current Version Of The Engine Manufacturer Maintenance Manual

1. Restriction in Air filter or Duct Between Air Cleaner and Turbocharger

Corrective Action(s)
Remove Restriction or Replace Parts As Needed
Refer To Current Version Of The Airframe Manufacturer Maintenance Manual

2. Heavy Carbon Buildup Behind Turbine Wheel

Corrective Action(s)
Perform Visual inspection of the Compressor and Turbine wheels for Foreign Object Damage, Rubbing, and Axial / Radial Play
Refer to Current Version Of Overhaul / Maintenance Manual 400600-0000

3. Heavy Sludge or Coking in Center Housing

Corrective Action(s)
Perform Visual inspection of the Center Housing Oil Outlet Port
Refer to Current Version Of Overhaul / Maintenance Manual 400600-0000

1. Turbocharger Leakage at Compressor Side

Corrective Action(s)
Air Cleaner Element Clogged
Refer To Current Version Of The Engine Manufacturer Maintenance Manual
Restriction or Faulty Check Valve In Turbocharger, Oil Drain Line Remove Restriction or Replace Parts As Needed
Refer To Current Version Of The Engine Manufacturer Maintenance Manual
Malfunction In Oil Scavenge Pump Or Drain Sump
Refer To Current Version Of The Engine Manufacturer Maintenance Manual
Restriction in Engine Crankcase Breather
Refer To Current Version Of The Engine Manufacturer Maintenance Manual
Excessive Operation at Low Manifold Pressure Setting

1. Turbocharger Leakage at Turbine Side

Corrective Action(s)
Restriction or Faulty Check Valve in Turbocharger, Oil Drain Line Remove Restriction or Replace Parts As Needed
Heavy Sludge or Coking in Center Housing Perform Visual inspection of the Center Housing Oil Outlet Port
Refer to Current Version Of Overhaul / Maintenance Manual 400600-0000
Restriction in Engine Crankcase Breathe
Refer To Current Version Of The Engine Manufacturer Maintenance Manual
Malfunction In Oil Scavenge Pump Or Drain Sump
Refer To Current Version Of The Engine Manufacturer Maintenance Manual

1. Compressor Wheel Damaged by Foreign Object

Corrective Action(s)
Clean and Repair Air Induction System As Required
Refer To Current Version Of The Airframe Manufacturer Maintenance Manual
Repair, Overhaul or Replace Turbocharger

2. Turbine Wheel Damaged by Foreign Object

Corrective Action(s)
Inspect Engine Cylinders And Exhaust System
Refer To Current Version Of The Engine Manufacturer Maintenance Manual
Repair, Overhaul or Replace Turbocharger

3. Heavy Carbon Buildup Behind Turbine Wheel

Corrective Action(s)
Perform Visual Inspection For Axial / Radial Play
Refer to Current Version Of Overhaul / Maintenance Manual 400600-0000
Repair, Overhaul or Replace Turbocharger

4. Heavy Sludge or Coking in Center Housing

Corrective Action(s)
Perform Visual inspection of the Center Housing Oil Outlet Port
Refer to Current Version Of Overhaul / Maintenance Manual 400600-0000
Repair, Overhaul or Replace Turbocharger