New AD from the FAA for Rotax 912 and 914 engines. Requires carburetor float replacements.

AD 2016-23-04 becomes effective December 7th 2016. Here is the meat of it: 

(c) Applicability

This AD applies to BRP-Powertrain GmbH & Co KG Rotax model 912 F2, 912 F3, 912 F4, 912 S2, 912 S3, and 912 S4 engines, and Rotax 914 F2, 914 F3, and 914 F4 engines with:

(1) Engine serial numbers (S/Ns) listed in Planning Information, Paragraph 1, Criterion A, of BRP-Powertrain GmbH & Co KG Alert Service Bulletin (ASB) ASB-912-069R1/ASB-914-051R1 (one document), Revision 1, dated July 22, 2016.

(2) Carburetor part numbers (P/Ns) and S/Ns listed in Planning Information, Paragraph 1, Criterion B, of BRP-Powertrain GmbH & Co KG ASB ASB-912-069R1/ASB-914-051R1 (one document), Revision 1, dated July 22, 2016; or

(3) Carburetor floats, P/N 861185, that do not have 3 dots molded on the surface, and installed after May 9, 2016.

(d) Reason

This AD was prompted by a report of a quality escape in the manufacturing of the affected carburetor floats. We are issuing this AD to prevent failure of the carburetor float, failure of the engine, in-flight shutdown, and loss of the airplane.

(e) Actions and Compliance

Comply with this AD within the compliance times specified, unless already done.

(1) Within 25 flight hours (FHs) or 30 days after the effective date of this AD, replace any affected carburetor float with a float that is eligible for installation in accordance with the Accomplishment Instructions, Paragraph 3, of BRP-Powertrain GmbH & Co KG Rotax ASB ASB-912-069R1/ASB-914-051R1 (one document), Revision 1, dated July 22, 2016.

(2) After the effective date of this AD, do not install on any engine a carburetor float, P/N

861185, delivered between May 8, 2016, and July 17, 2016, that does not have 3 dots molded into the surface. If the delivery date is not documented, do not install the part.

You can look at the whole thing on the FAA.gov website.  I don't know how many of you fly carbureted Rotax but might want to take a look at this as it seems there was a manufacturing error on some floats.