AD FAA-2013-0263

We are superseding an existing airworthiness directive (AD) for all BRP-Powertrain GmbH & Co KG Rotax model 912 F2; 912 F3; 912 F4; 912 S2; 912 S3; 912 S4; 914 F2; 914 F3; and 914 F4 reciprocating engines. That AD required a one-time visual inspection for excessive oil or carbon deposits on the cylinder No. 2 and No. 3 (\2/3\) spark plug center and grounding electrodes, and if found, replacement of the cylinder head before further flight. This AD was prompted by a report that additional engine cylinder heads are likely to be affected. We are issuing this AD to prevent excessive oil consumption, which could result in an in-flight engine shutdown, forced landing, and damage to the airplane.