Transparent Fleet:

The segment of the existing fleet of engines and aircraft for which a new fuel is a drop-in is called the “transparent fleet.” Changes such as new or modified hardware, adjustments, or new operating procedures/limitations are not required for the aircraft and engines...

Special Airworthiness Information Bulletin (SAIB):

A Special Airworthiness Information Bulletin is an information tool that alerts, educates, and makes recommendations from the FAA to the aviation community. SAIBs contain non-regulatory information and guidance that are not mandatory and do not meet the criteria for a...

OEM Service Bulletin:

Original Equipment Manufacturer (OEM) Service Bulletins are communication vehicles used by engine and aircraft type certificate (TC) holders to advise owners/operators of approved aviation fuels. New aviation fuels added to a TC are approved under traditional...

Non-Transparent Fleet:

The segment of the existing fleet of engines and aircraft for which a new fuel is not a drop-in is called the “non-transparent fleet.” FAA approval of new operating limitations and changes such as new or modified hardware, adjustments, or new operating...

Drop-In Fuel:

A “drop-in” fuel does not affect the airworthiness and performance of the existing aircraft and engines and typically does not require new aviation fuel-related operating limitations. An extensive qualification test program that encompasses fuel property evaluation...