17-30Viking

Improperly lubricated roller bearings in certain S-1200 series magnetos may cause overheating and magneto seizure. This AD requires replacement of affected magnetos or inspection and component replacement if no white grease is detected.

Engine models named IO-520, IO-540, IO-550, TIO-540

Some Continental Aerospace Technologies reciprocating engines have cross-flow cylinder assemblies that can fracture, causing in-flight engine failures. This AD requires visual inspection of the cross-flow cylinder assembly and modification or replacement if defects are found.

Engine models named IO-550-G, IO-550-N, IO-550-P, IO-550-R

Engine exhaust system weld joints have been cracking and leaking on these engines. This AD requires initial and repetitive inspections of the exhaust system welds and torque checks of the exhaust pipe flange mounting nuts.

Engine models named TIO-540-AJ1A

Externally mounted fuel injector fuel lines on certain Lycoming fuel injected engines can fail, potentially causing uncontrolled engine fires and damage. This AD requires inspection and replacement if necessary of fuel injector fuel lines with proper clamping.

Engine models named IO-540-A1A5, IO-540-AA1A5, IO-540-AA1B5, IO-540-AB1A5, IO-540-AC1A5, IO-540-AE1A5, IO-540-B1A5, IO-540-B1C5, IO-540-C1B5, IO-540-C1C5, IO-540-C4B5, IO-540-C4D5D

Cracked engine exhaust pipes have been reported on certain Lycoming TIO-540-AJ1A engines, which could lead to engine fire or harmful exhaust gases entering the cabin. This AD requires inspection of exhaust pipes for cracks and replacement of the turbocharger mounting bracket.

Engine models named TIO-540-AJ1A

Propeller governor shaft set screws can come loose due to improper installation, potentially causing engine and airframe damage. This AD requires inspection and corrective action on affected Lycoming wide deck aerobatic engines equipped with front-mounted propeller governors.

Engine models named IO-540-K1K5

Certain Continental Motors reciprocal engines with Superior Air Parts investment cast cylinder assemblies are at risk of cylinder head separation and engine damage. The AD requires initial and repetitive inspections and compression tests to detect cracks in affected cylinders.

Engine models named IO-520, IO-550 series

Certain Hartzell Engine Technologies turbochargers with specific serial numbers can experience turbine wheel failure, causing loss of engine power, oil loss, or oil fires. This AD requires removing affected turbochargers from service before further flight.

Engine models named TIO-540-AK1A

Certain Lycoming reciprocating engine crankshafts can fail, causing total engine power loss and in-flight engine failure. This AD requires replacement of affected crankshafts as listed in Lycoming Mandatory Service Bulletin 569A.

Engine models named IO-540

Certain Continental Motors starter adapters may have gear shafts that fracture, which could cause oil scavenge pump failure and engine in-flight shutdown. Affected engines must have their starter adapters replaced with eligible units.

Engine models named IO-550-N

This AD rescinds previous requirements for Lycoming TIO-540-A series engines due to outdated service bulletin references. The requirements have been superseded by AD 2008-14-07, which incorporates the current mandatory service bulletin.

Engine models named TIO-540-A series

Affected airplanes equipped with STC SA1762SO may not have correct minimum control speed (VMC) markings on airspeed indicators or limitation placards. The AD requires verifying that airspeed indicator(s) and/or airspeed limitation placard(s) have proper VMC markings for the installed STC.

Engine models named IO-550

TCM EQ3 cylinders have been found cracking, which can cause loss of engine power and engine fires. The AD requires visual inspections of EQ3 cylinders for cracks, with removal of all EQ3 cylinders as the terminating action.

Engine models named IO-520, IO-550

A machining defect in certain Kelly Aerospace Power Systems turbochargers can cause the turbine rotor to separate from the shaft, potentially resulting in engine power loss or oil loss. This AD requires removing affected turbochargers before further flight.

Engine models named IO-550-N

Testing identified stress conditions affecting fatigue life and damage tolerance of certain McCauley propellers installed on specific TCM engines, risking blade separation and loss of control. The AD requires RPM restrictions, installation of a placard, 10,000-hour total time-in-service life limits, removal of propellers exceeding this limit, and initial and repetitive blade inspections.

Engine models named IO-520, IO-550

Certain Lycoming 360 and 540 series engines have experienced crankshaft failures that could cause total engine power loss and in-flight engine failure. This AD requires replacement of affected crankshafts.

Engine models named IO-540, TIO-540

Magneto impulse coupling assemblies on certain Lycoming engines can fail, potentially causing engine failure. This AD reduces the inspection interval for riveted-impulse coupling assemblies installed on specified Lycoming engine models.

Engine models named IO-540, TIO-540

Crankshaft gear retaining bolts may loosen or fail on certain Lycoming direct-drive reciprocating engines, potentially causing sudden engine failure. The AD requires removal of existing gear retaining bolts and lockplates from service, installation of new hardware, and inspection of crankshaft gear installation after propeller strikes, sudden stoppages, or overhaul.

Engine models named TIO-540

Certain crankshaft gear retaining bolts may fail, causing loss of engine power and a forced landing. This AD requires replacing the affected bolts with improved versions using approved kits.

Engine models named IO-540, TIO-540

Certain Textron Lycoming fuel-injected engines equipped with Crane/Lear Romec rotary fuel pumps are prone to fuel leakage from the pump relief valve, which could cause engine failure or fire. Owners must inspect pump relief valve attaching screws for proper torque and replace the affected fuel pump at or before engine overhaul with a new design pump having enhanced leak resistance.

Engine models named IO-540, TIO-540

Textron Lycoming reciprocating engines have experienced crankshaft failures that can result in total engine power loss and in-flight engine failure. This AD requires replacement of suspect crankshafts that were hammer forged with press-forged crankshafts before further flight.

Engine models named IO-540, TIO-540

Oil can leak between the converter plate and accessory housing on certain Lycoming engines, potentially causing complete engine oil loss, engine seizure, and fire. This AD requires replacement of the oil filter converter plate gasket or kit, inspection of the oil filter base for leakage, and eventually installation of an improved gasket or kit to eliminate the need for repetitive replacements.

Engine models named IO-540-C4D5D, IO-540-K1A5D, IO-540-K1B5D, IO-540-K1E5D, IO-540-K1F5D, IO-540-K1G5D, IO-540-K1J5D, IO-540-L1A5D, IO-540-L1B5D, IO-540-M1A5D, IO-540-M1B5D, IO-540-M2A5D

Certain Teledyne Continental Motors engines have experienced crankshaft failures due to defects in the propeller mounting flange. Owners must remove a core sample from the propeller mounting flange and send it to TCM for evaluation.

Engine models named IO-520, IO-550

Teledyne Continental Motors crankshafts are susceptible to cheek cracks that can cause engine failure and forced landing. Operators must inspect crankshaft cheeks for cracks per TCM service bulletins and replace any cracked crankshafts before further flight.

Engine models named IO-520, IO-550

Slick Aircraft Products magnetos on certain Textron Lycoming O-540 and IO-540 engines can experience severely worn and failed impulse couplings, which may seize the engine. Operators must remove the affected magneto and inspect the impulse coupling pawl for wear.

Engine models named IO-540-K1A5, IO-540-K1B5, IO-540-K1G5

Certain Lycoming reciprocal engines may have defective piston pins that could fail and cause engine failure. Affected engines must be removed from service and replaced with serviceable parts according to the referenced service bulletin.

Engine models named IO-540, TIO-540

Affected cylinder assemblies can develop cracks that lead to cylinder head separation and engine failure. This AD requires removal of higher-time cylinder assemblies and replacement with serviceable parts, or dye penetrant inspections of mid-time assemblies initially and repetitively.

Engine models named IO-540-M1B5D, TIO-540-A2C, TIO-540-F2BD, TIO-540-J2B, TIO-540-J2BD, TIO-540-N2BD, TIO-540-R2AD, TIO-540-S1AD

Loose or separated engine oil filter adapters can cause loss of engine oil and engine stoppage in flight. This AD requires inspecting the oil filter adapter for security and oil leakage, applying torque putty to seal the assembly, and performing repetitive inspections of the torque putty and adapter threads.

Engine models named IO-520, IO-550

Cracking or distortion of engine exhaust system flanges, V-band coupling, and pipes can cause engine compartment fires and smoke in the cabin. The AD requires upgrading the exhaust system to a new design configuration and establishes inspection intervals based on which exhaust system design is installed.

Engine models named TIO-540-S1AD

Unapproved connecting rod bolts sourced from Superior Air Parts, Inc., have failed in certain Textron Lycoming engines, potentially causing engine failure. The AD requires removing all suspect connecting rod bolts prior to further flight and replacing them with serviceable bolts.

Engine models named IO-540-A1A5, IO-540-AA1A5, IO-540-B1A5, IO-540-B1C5, IO-540-C1B5, IO-540-C4B5, IO-540-C4C5, IO-540-C4D5D, IO-540-D4A5, IO-540-E1A5, IO-540-E1B5, IO-540-G1A5