Superior / Lycoming Crankshaft AD

Well, it’s not yet an AD, but…

Refer to the Federal Register for full details in the published NPRM.  The proposed AD applies to both Superior Air Parts and Lycoming O- IO- and AEIO-360 engines with a certain Superior crankshaft assembly.  It is due to 3 crankshaft failures that occurred in March 2017, August 2017, and October 2018.

The cause was traced back to a manufacturing process error that resulted in surface embrittlement that can lead to fatigue cracking.  The affected cranks were manufactured in 2012 and 2014.  I purchased my IO-360-X from Barrett in March of 2015, and my crank is on the list.  Here are Applicability and Required Action excerpts from the NPRM:

(c) Applicability

This AD applies to the reciprocating engine models identified in paragraphs (c)(1) and (2) of this AD with a Superior Air Parts, Inc. (SAP) crankshaft assembly, part number (P/N) SL36500-A20 or P/N SL36500-A31, with serial numbers 82976-01; 82976-02; SP12-0003 through SP12-0089, inclusive; SP13-0034 through SP13-0150, inclusive; or SP14-0151 through SP14-0202, inclusive; installed.

(1) With SAP crankshaft assembly, P/N SL36500-A20, installed:

(i) SAP Model IO-360-series and O-360-series reciprocating engines.

(ii) Lycoming Engines (Lycoming) Model IO-360-B2F, IO-360-L2A, O-360, O-360-A2A, O-360-A2D, O-360-A2E, O-360-A2F, O-360-A2G, O-360-B2A, O-360-C2A, O-360-C2C, O-360-C2D, O-360-C2E, O-360-D2A, and O-360-D2B reciprocating engines.

(2) With SAP crankshaft assembly, P/N SL36500-A31, installed:

(i) SAP Model IO-360-series and O-360-series reciprocating engines.

(ii) Lycoming Model AEIO-360-H1A, IO-360-B1A, IO-360-B1B, IO-360-B1D, IO-360-B1E, IO-360-B1F, IO-360-M1A, O-360, O-360-A1A, O-360-A1C, O-360-A1D, O-360-A2A, O-360-C1A, O-360-C1G, O-360-C1C, O-360-C1E, and O-360-C1F reciprocating engines.

(g) Required Action

Within 25 engine operating hours after the effective date of this AD, remove the crankshaft assembly from service.

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