This notice provides inspectors with information on the Federal
Aviation Administration (FAA)-approved deicing program for Winter 2024–2025. This notice is
designed to be used in conjunction with the FAA Holdover Times (HOT), Degree-Specific
Holdover Times (DSHOT), Regression Data, and Allowance Time Guidelines for
Winter 2024–2025. This notice replaces Notice N 8900.667, FAA-Approved Deicing Program
for Winter 2023–2024, which expired on July 31, 2024.

This notice provides guidance to aviation safety inspectors (ASI)
authorized to perform field approvals, Flight Standards (FS) Safety Assurance offices using the
Electronic FAA Form 337 (E337) system, and Aviation Safety Engineers (ASE). This notice is
administrative in nature

On September 7, 2023, the Federal Aviation Administration (FAA)
published Notice N 8100.18, Organization Designation Authorization (ODA) Holder
Interference with ODA Unit Members (UM) and Communication between UMs and the FAA, to
provide 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. This Notice extends the ongoing interference reporting, communication
instructions, and Interference Review Team (IRT) procedures in Notice N 8100.18. The FAA
intends that the policies contained in this Notice will be incorporated into the FAA’s next
revision of FAA Order 8100.15, Organization Designation Authorization Procedures, except that
the ongoing role of the IRT would remain as established by this Notice. To the extent that this
Notice conflicts with the current Order 8100.15B, the contents of this Notice supersede that
Order

This order restates current Flight Standards Service (FS) policy for personnel to use as they develop and execute annual surveillance work programs; incorporates organizational changes and policy division changes; and updates previous guidance work activities, National Transportation Safety Board (NTSB) recommendations, Inspector General (IG) recommendations, and congressional mandates. This order contains guidance that is pertinent to Title 14 of the Code of Federal Regulations (14 CFR) parts 61, 65, 91, 91 subpart K (part 91K), 105, 125, 129, 133, 137, and 183 Airworthiness Organization Designation Authorizations (ODA).

This order establishes policies and procedures for issuing airworthiness certificates, export
certificates of airworthiness, and special flight authorizations for aircraft. This order applies to
Federal Aviation Administration (FAA) aviation safety inspectors and certain persons designated
to act as representatives of the FAA.

This notice provides guidance to aviation safety inspectors (ASI)
authorized to perform field approvals, Flight Standards (FS) Safety Assurance offices using the
Electronic FAA Form 337 (E337) system, and Aviation Safety Engineers (ASE). This notice is
administrative in nature.