Lycoming Piston Engines

AD/LYC/107 Amdt 2 (continued)

Requirement: 1. MSB 552 listed TIO-540 and LTIO-540 engines: Replace the crankshaft in accordance with the requirements of Textron Lycoming MSB 552.

2. MSB 552 listed TIO-540 and LTIO-540 crankshafts: Replace the crankshaft in accordance with the requirements of Textron Lycoming MSB 552.

3. IO-540 series engines incorporating an turbocharger STC:

Determine the serial number of the crankshaft; and

b. If listed in Table 2 of Textron Lycoming MSB 552, replace the crankshaft in accordance with the requirements of Textron Lycoming MSB 552.

Note 2: Prior replacement of a crankshaft in accordance with either MSB 550 or 552 constitutes compliance with the requirements of this directive.

Note 3: FAA Airworthiness Directive 2002-19-03 Amdt 39-12883 refers.

Compliance: Unless previously accomplished:

Installed engines: Within 5 hours time in service from the effective date of this Directive.

b. Spare engines: Before installation in an aircraft. This Amendment becomes effective on 2 October 2002.

Background: This Directive was originally issued to require certain crankshafts to be removed from service. The requirement follows advice from the engine manufacturer of a crankshaft material defect being identified in the investigation of a number of engine failures. This amendment increases the engines applicable to include IO-540 engines incorporating an STC approved turbocharger.