This revised Special Airworthiness Information Bulletin (SAIB) informs owners, operators, repair stations, and flight standard district offices that compliance with a new or revised airworthiness limitation section (ALS) issued by a design approval holder (DAH), or other entity, as a type design change is not mandatory for in-service aircraft operating pursuant to Title 14 of the Code of Federal Regulations (14 CFR) part 91, unless the aircraft owner/operator voluntarily incorporates the change, it is mandated by an airworthiness directive (AD) to resolve an unsafe condition or required by a previously agreed upon maintenance program..

A recent accident involving an in-flight propeller failure and separation has again brought to light the need for continued diligence in the use of liquid penetrant inspection methods.

This Special Airworthiness Information Bulletin (SAIB) alerts registered owners, operators, and certified repair facilities of all airplanes equipped with Teledyne Continental Motors (TCM) Model C75, C85, C90, C125, C145, O-200, O-300, and GO-300 series and Rolls-Royce plc (RR) C90, O-200 and O-300 series reciprocating engines of miscommunication regarding the applicability section of AD 94-05-05 R1, effective on February 13, 1996. The FAA has received reports that FAA personnel have provided guidance that has resulted in confusion on complying with AD 94-05-05R1. The intent of this SAIB is to correct this miscommunication.

This Special Airworthiness Information Bulletin (SAIB) is to alert owners, operators, and maintenance technicians of Piper Aircraft, Inc. (Piper) Model PA-28-140 airplanes with Power Flow Systems, Inc. Supplemental Type Certificate (STC) SA02168AT kit installed of an airworthiness concern related to the carburetor throttle control arm bracket impacting the collector assembly.