This advisory circular (AC) provides airworthiness and operational authorization guidance
material for operators, pilots, certificate holders, and/or program managers conducting Title 14
of the Code of Federal Regulations (14 CFR) part 91, §§ 91.180 and 91.706 Reduced Vertical
Separation Minimum (RVSM) operations. RVSM airspace is any airspace or route between
flight level (FL) 290 and FL 410 inclusive where aircraft are separated vertically by 1,000 feet.
This AC has been updated to include guidance on eligibility and compliance for §§ 91.180
and 91.706 RVSM operations when operators seek RVSM authorization under the provisions of
the new Part 91 Appendix G, Section 9, Aircraft Equipped with Automatic Dependent
Surveillance – Broadcast Out.
The Federal Aviation Administration (FAA) intends to transition current authorizations, issued
under part 91 appendix G, section 3, to monitor operations under the provisions of part 91
appendix G, section 9. This action reduces the operator and FAA administrative burdens
associated with maintaining the part 91 appendix G, section 3 authorizations.

This AC provides criteria and
describes acceptable methods for obtaining approval to use Offshore Standard Approach
Procedures (OSAP), Airborne Radar Approaches (ARA), and Helicopter En Route Descent
Areas (HEDA) to descend in uncontrolled airspace to an altitude where the pilot can proceed to
land using visual references to the surface.

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
conducting operations under Title 14 of the Code of Federal Regulations (14 CFR)
parts 91, 91 subpart K (part 91K), 121, 125, and 135.

This advisory circular (AC) provides the applicant with a means to control products and articles prepositioned prior to the issuance of a design approval (e.g., type certificate (TC), or supplemental type certificate (STC).

This order provides procedural guidance for Aircraft Certification Service (AIR) personnel to
evaluate and approve production approval activities of manufacturers that produce products or
articles in accordance with title 14, Code of Federal Regulations (14 CFR) part 21, Certification
Procedures for Products and Articles. The policy contained within this order will support the
issuance of the Federal Aviation Administration (FAA) production approvals for:
1. Production certificate (PC).
2. Parts manufacturer approval (PMA).
3. Technical standard order authorization (TSOA).
Additionally, this revision references 14 CFR part 5, Safety Management System (SMS),
requirements and establishes prepositioning policy for shipping “prototype” aircraft engines,
propellers and articles that are pending FAA-approved design

This order describes the surveillance of production approval holders (PAH) who rebuild or alter products or articles under Title 14, Code of Federal Regulations (14 CFR) 43.3(j) and approve the return to service (RTS) of products or articles in accordance with § 43.7(d). PAHs include holders of a production certificate (PC), parts manufacturing approval (PMA), and technical standard order authorization (TSOA). In addition, this order also describes the completion of Federal Aviation Administration (FAA) Form 8130-3, Authorized Release Certificate, FAA Form 8130-3, Airworthiness Approval Tag, for the RTS of aircraft engines, propellers, or articles.

This advisory circular (AC) provides information on engine time-in-service
interval extensions. The AC explains the background of engine time-in-service intervals as well
as the Federal Aviation Administration’s (FAA) regulatory requirements for time limitations and
time-in-service intervals for engine overhauls. The AC also provides aircraft operators with
information on the best practices for an engine time-in-service interval extension program and
how to obtain an engine time-in-service interval extension.

This change to the AC removes content referring to
airframe/engine utilization reports, as these reports are no longer required. This change also
clarifies maintenance program instructions and requirements.