Potential decreased service life of Slick 4-cylinder magneto distributor gear assemblies. Based on process and component improvements following the initial release of this service bulletin, the serial number range is being extended in this revision. Magnetos previously returned for compliance to SB1-15 must be returned or inspected for compliance to this revision SB1-15A.
This Special Airworthiness Information Bulletin (SAIB) advises airplane operators, fixed base operators (FBOs), FAA repair stations, Flight Standards District Offices (FSDOs), and foreign civil aviation authorities of jet fuel supplies for which the concentration of aromatic hydrocarbons and the net heat of combustion may not have been measured in accordance with methods specified by the type certificate (TC) holder. These jet fuel supplies would not be compliant with the FAA approved jet fuel operating limitations and should not be used on the TC holders’ products.