LA-4Buccaneer · Renegade

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-360-A1A, IO-360-A1B, IO-360-A1B6, IO-360-A1B6D, IO-360-A1C, IO-360-A1D, IO-360-A1D6, IO-360-A2A, IO-360-A2B, IO-360-A3B6, IO-360-A3B6D, IO-360-B1B

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 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

This AD rescinds previous requirements for Lycoming TIO-540-A series engines due to outdated service bulletin references. The requirements have been superseded by AD 2008-14-07, which incorporates the current mandatory service bulletin.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

Hartzell propeller hubs may crack, causing blade separation and loss of aircraft control. The AD requires initial and repetitive eddy current inspections of the front cylinder half for cracks, removal of cracked hubs from service, or installation of improved design hub (suffix SN A or B) as terminating action.

Engine models named IO-360 series, O-360 series

Certain crankshafts in Lycoming AEIO-360, IO-360, O-360, LIO-360, and LO-360 series engines can fail, causing total engine power loss and possible aircraft loss. This AD requires replacement of affected crankshafts.

Engine models named IO-360, O-360

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-360, IO-540, O-360, 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 O-360 series, 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-360, 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-360-A1B6D, IO-360-A1D6D, IO-360-A3B6D, IO-360-A3D6D, IO-360-C1E6D, IO-360-J1A6D, IO-360-J1AD, IO-540-C4D5D, IO-540-K1A5D, IO-540-K1B5D, IO-540-K1E5D, IO-540-K1F5D

Propeller mounting bolts may lose torque due to operating conditions and environmental factors, risking propeller separation. The AD requires installing improved mounting bolts, torquing them to a higher value, flying the airplane once, and retorquing as needed.

Engine models named O-360 series

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-360, IO-540, O-360, 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

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