The Federal Aviation Administration (FAA) shares the Environmental Protection Agency's (EPA) concerns about lead emissions from small aircraft. Owners and operators of more than 200,000 piston-engine aircraft operating in the United States rely on aviation gasoline (avgas) to power their aircraft. Avgas is the only remaining lead-containing transportation fuel. Lead in avgas prevents damaging engine knock, or detonation, that can result in a sudden engine failure. Lead is a toxic substance that can be inhaled or absorbed in the bloodstream, and the FAA and EPA and industry are partnering to remove it from avgas. Avgas emissions have become the largest contributor to the relatively low levels of lead emissions produced in this country.

To help "get the lead out," FAA is supporting the research of alternate fuels at our William J. Hughes Technical Center in Atlantic City. We are working with the aircraft and engine manufacturers, fuel producers, the EPA and industry associations to overcome technical and logistical challenges to developing and deploying a new, unleaded fuel.

The FAA continues to work with EPA to make this a smooth transition and to ensure the supply of aviation gasoline is not interrupted, and that all aircraft can continue to fly.

Recent Program Updates

July 28th, 2014: PAFI update at EAA AirVenture Oshkosh

On July 28th at the EAA AirVenture in Oshkosh, WI, the FAA and the PAFI Steering Group presented an update on the PAFI test program. The mission of this effort is to develop and implement a path forward for the identification, evaluation, fleet-wide certification, and deployment of the most promising unleaded replacement fuels with the least impact on the existing piston-engine aircraft fleet. The briefing presented is available below:
PAFI Briefing (PDF)

Information on AirVenture can be found on the EAA website at the following link:

July 10th, 2014: FAA Receives Unleaded Avgas Fuel Proposals

The FAA's request for fuel producers to submit unleaded avgas formulations to replace 100LL closed July 1st, 2014. The FAA received nine fuel proposals from five fuel producers; Afton Chemical Company, Avgas LLC, Shell, Swift Fuels, and a consortium of BP, TOTAL, and Hjelmco. The FAA will now assess the viability of the candidate fuels in terms of their impact on the existing fleet, the production and distribution infrastructure, their impact on the environment, their toxicology, and the cost of aircraft operations. Several of the fuels will be selected for further evaluation in Phase 1 of the Piston Alternative Fuels Initiative (PAFI) test program. For the Phase 1 laboratory and rig test program, selected fuel suppliers will be requested to provide 100 gallons of fuel for this evaluation. The Phase 1 test program is anticipated to take approximately one year, at which point the FAA will evaluate the fuels for continued participation in Phase 2 test of the test program. Two or three of the Phase 1 fuels will be selected for participation in the Phase 2 engine and aircraft test program, for which the suppliers will be requested to provide 10,000 gallons of fuel. The Phase 2 test program is expected to take approximately two years, and will generate data that can be used to obtain an ASTM Production Specification for the fuels, and to certify most of the existing fleet to operate on these fuels. The FAA issued a press release which can be found at the link below:
Press Release – FAA Receives Unleaded Fuel Proposals, July 10, 2014

June 18, 2014: There will be a Screening Information Request (SIR) – Question & Answer session during the ASTM meeting in Indianapolis on June 23, 2014. The session will be between 3:00 P.M. and 5:00 P.M. local time.

The purpose of the session is to answer offeror's questions about responding to the SIR. The SIR closes July 1, 2014.

Questions must be submitted in writing to the Contracting Officer by 4 PM on June 18, 2014. Please email questions to (No phone calls, please.)

Meeting Location:

June 22-26, 2014
JW Marriott Indianapolis
Indianapolis, IN

Bridge Line: 888-924-3230
Participant Passcode: 477034

For additional information please see the following announcements:

April 22, 2014: 2nd SIR Informational Webinar Available Online

The information briefing held on April 16th can now be viewed online. Click on "View Now" to view the webinar.

Approximately 40 people signed up and attended the conference. Members of the project team went over a presentation addressing top issues raised by the questions, and an overview of answers to 10 of the 19 submitted questions. Also available are all 19 submitted questions and their answers.

The webinar lasted approximately one hour, and the feedback received from attendees was 100% positive. The industry and government members of PAFI are confident that the seminars have addressed the questions of potential fuel offerors, and that the community is adequately informed about the program.

Second SIR Informational Session – Rescheduled to April 16, 2014

A second informational session will be held regarding the Replacement Unleaded Avgas R&D program, and the FAA request for candidate fuels, on April 16th. The latest version of the fuels request (Screening Information Request – SIR) can be found at the following link:

Also available at this link are the two presentations that we gave at the December 2013 ASTM meeting regarding the PAFI program and the SIR. In addition, the link also contains the official notification of the second informational session. This session will be presented in a Question and Answer format. As noted, an open period for interested parties to submit questions will extend through March 3rd. On March 26th, the questions will be presented, along with answers, by members of the PAFI Steering Group in a webinar. The signup page for the webinar can be found at:

January 14-15, 2014: Piston Aviation Fuel Initiative Steering group (PAFI PSG) meeting held

The PAFI program enters the New Year on a positive note with Congress having authorized $6M for the FY14 budget to support the PAFI test program at the FAA Technical Center. The PAFI Industry Co-lead was identified and brought onboard in September 2013. Bi-monthly PAFI Steering Group meetings were launched in 2013 and will continue through 2014. This team continues to meet and complete the UAT ARC recommendations. To date all 5 key recommendations have been meet and 4 out of the 14 follow-on recommendations have been completed.

Currently in-work under PAFI PSG: A Technical Evaluation Committee (TEC), reporting directly to the FAA, has been formed by the FAA to serve as the primary evaluator of fuel proposals furnished in response to the SIR. Providing industry support and guidance to the PSG is a Technical Advisory Committee (TAC) whose membership was identified in late 2013. TAC membership includes the primary OEM product manufacturers and other key stakeholders. Initial membership includes Air BP, Air Repair, AVFUEL Corp, Continental Motors, Beechcraft, Cape Air, Cessna Aircraft, Chevron, Cirrus, Dixie Services, Epic Aviation, Ethyl Corp, Everts Air, Exxon Mobil, Hartzell Propeller, Lycoming Engines, McCauley Propeller, Mooney Aircraft, Phillips 66, Piper Aircraft, Precision Airmotive, Precision Engines, and Robinson Helicopter.

These accomplishments all reflect actions implemented pursuant to the recommendations of the UAT ARC final report.

December 9, 2013: PAFI/SIR Briefing at ASTM Meeting

Presenters from the Piston Aviation Fuels Initiative Steering Group (PSG) were on hand at the ASTM meeting in Tampa Florida. They provided two presentations. The first presentation was done collaboratively by Industry and the FAA to discuss PAFI, the accomplishments to date, the overview of the FAA Technical Center Testing Program for Phase 1 and Phase 2, and the fleetwide certification challenge. Piston Aviation Fuels Initiative (PDF). The second presentation was done by the FAA; it provided a briefing on Screening Information Request (SIR fuels request), FAA Screening Information Request (SIR) – Unleaded Avgas (PDF). This presentation provided background, instructions, and milestones for the SIR. The session was well attended and many issues were raised and discussed.

November 21, 2013: General Aviation Caucus Briefing

On November 21, 2013, the FAA, EPA and industry members of the Piston Aviation Fuel Initiative Steering Group met with Senators Begich and Johanns, co-leads of the Senate General Aviation Caucus Briefing and Senate staff. The meeting was to provide the avgas history and background, and an update on progress being made in the transition to an unleaded avgas. This briefing included discussion of the FAA Modernization and Reform Act of 2012 section 910 and the FAA's R&D plan and report (PDF).

The briefing also included discussion on the Unleaded Avgas Transition Aviation Rulemaking Committee (UAT ARC), and accomplishments made since receipt of that team's report and recommendations.

June, 2013: FAA Issues Request for Unleaded Replacements for General Aviation Gasoline (Avgas)

On June 10, 2013, FAA issued a request for candidate fuel producers to submit unleaded fuel formulations to be evaluated as replacements for 100LL ( This announcement is a significant milestone in a government/industry collaborative effort to find an unleaded replacement fuel for the general aviation industry. The request for candidate fuels kicks off a multi-year R&D program that will help select the best unleaded fuel(s) with least impact on the general aviation fleet.