This AC provides information
on the hazards and risks of in-flight fires on transport category aircraft. The information
includes recommended crewmember procedures and training for combating general and
high-energy fires (HEF) caused by lithium batteries. This AC is applicable to operators
certificated under Title 14 of the Code of Federal Regulations (14 CFR) parts 91,
91 subpart K (part 91K), 121, 125, and 135. This guidance is not legally binding in its
own right and will not be relied upon by the Federal Aviation Administration (FAA) as a
separate basis for affirmative enforcement action or other administrative penalty.
Conformity with the guidance is voluntary only and nonconformity will not affect rights
and obligations under existing statutes and regulations.

Ozone-depleting substances, including chlorofluorocarbons (CFCs), have been shown to deplete
the Earth’s stratospheric ozone layer resulting in adverse environmental damage and health effects by
exposing the Earth to the sun’s harmful ultraviolet radiation as well as contributing to global climate
change. Concerns about the formation of an “ozone hole” over the Antarctic in the early 1980s led to
the signing of an international agreement, the Montreal Protocol on Substances that Deplete the Ozone
Layer, in 1987 (Montreal Protocol). The Kigali Amendment was adopted to phase down the
production and consumption of hydrofluorocarbons (HFCs) worldwide, in addition to CFCs, in 2016.
The Montreal Protocol and the national laws implementing it are working. Ozone-depleting
substances in the atmosphere have begun to decrease, and Earth’s protective ozone layer is showing
signs of recovery. In recent years, new regulations have also expanded to tracking and mitigating
fugitive emissions from greenhouse gases that are non-ozone-depleting substitutes as well.

This notice supplements Federal Aviation Administration (FAA)
Order 8100.15B, Organization Designation Authorization Procedures, by providing instructions
and procedures intended to eliminate or minimize ODA holder interference with UMs
performing their authorized functions and to ensure free communication between UMs and the
FAA. The notice also updates certain instructions and procedures for FAA personnel in
evaluating applications submitted for ODA under the procedural requirements set forth in
Title 14 of the Code of Federal Regulations (14 CFR) part 183 subpart D and conducting
oversight of ODA holders approved under subpart D. To the extent that this notice conflicts with
Order 8100.15B, the contents of this notice supersede the order.

This notice supplements all policy, guidance, and documents
impacted by the structural and organizational changes for the Future of Flight Standards (FFS)
transformation where references to certain organizational entities are no longer valid. This notice
reissues and expands on Notice N 8900.598, Interim Policy on the Effects of the Future of Flight
Standards (FFS) Initiative on Current Policy, Guidance, and Documents, dated
September 14, 2021.

This notice is to notify all Principal Operations Inspectors (POI) of
changes to the Special Pilot-In-Command (PIC) Qualification Airports List.