Document Title: AC 20-18B, Qualification Testing of Turbojet and Turbofan Engine Thrust Reversers
Summary: This advisory circular (AC) provides guidance for demonstrating compliance with Title 14 of the Code of Federal Regulations (14 CFR) 33.97, Thrust reversers, and for certifying a thrust reverser for use with a turbojet or turbofan engine.
Documents for Download: Draft Document (MS Word)
Draft Document Comment Grid (MS Word)
Summary of Revisions (MS Word)
Reference: 14 CFR 33.97
Comments Due: March 13, 2015
How to Comment: Email comments to:
Alan.strom@faa.gov

Deliver comments by mail or hand to:
Federal Aviation Administration
Engine and Propeller Directorate
Standards Staff, ANE-111
12 New England Executive Park
Burlington, MA 01803

Fax comments to:
781-238-7199
Document Title: AC 20-53X Protection of Aircraft Fuel Systems Against Vapor Ignition Caused by Lightning
Summary: This advisory circular (AC) provides applicants with guidance for obtaining Federal Aviation Administration (FAA) approval of your compliance pursuant to Title 14, Code of Federal Regulations (14 CFR) 23.954, 27.954, and 29.954, Fuel System Lightning Protection. This AC recommends how to protect the aircraft’s fuel system from lightning strikes that may ignite fuel vapors.
Documents for Download: Draft Document (PDF)
Draft Document Comment Grid (MS Excel)
Reference:
Comments Due: April 1, 2015
How to Comment: Email comments to:
Lee.Nguyen@faa.gov

Deliver comments by mail or hand to:
Federal Aviation Administration
Aircraft Certification Services
Systems and Equipment Standards Branch AIR-130
470 L'Enfant Plaza, SW, Suite 4102
Washington, DC 20024

Fax comments to:
202-267-8589
Document Title: AC 25.954-X Transport Airplane Fuel System Lightning Protection
Summary: This proposed AC provides information and guidance on how to show compliance with the airworthiness regulations for transport category airplanes regarding lightning protection of fuel tanks and systems. These lightning protection requirements apply to normal conditions and possible failures of fuel tank structure and systems that could lead to fuel tank explosions. This AC also provides guidance on how to meet maintenance requirements and how to develop critical design configuration control limitations and instructions for continued airworthiness related to lightning protection features of the airplane fuel system.
Documents for Download: Draft Document (MS Word)
Draft Document Comment Grid (MS Word)
Reference: 14 CFR 25.954
Comments Due: April 1, 2015
How to Comment: Email comments to:
theresa.j.white@faa.gov

Deliver comments by mail or hand to:
Federal Aviation Administration
Transport Airplane Directorate
Transport Standards Staff, ANM-113
1601 Lind Ave. SW
Renton, WA 98057

Fax comments to:
425-227-1232
Document Title: AC 25.981-1X Fuel Tank Ignition Source Prevention Guidelines
Summary: This revised AC provides guidance for demonstrating compliance with the certification requirements for prevention of ignition sources, except lightning, which is addressed in AC 25.954-X, within the fuel tanks of transport category airplanes. This AC also identifies the need for prevention of failure conditions by which ignition will be created from sources other than lightning and describes a method using circuit protective devices such as arc fault circuit breakers (AFCB) or ground fault interrupter (GFI) to provide fail-safe features that have been approved as demonstrating compliance with 14 CFR 25.981. This guidance is applicable to transport category airplanes for which a new, amended, or supplemental type certificate is requested.
Documents for Download: Draft Document (MS Word)
Draft Document Comment Grid (MS Word)
Reference: 14 CFR 25.981
Comments Due: April 1, 2015
How to Comment: Email comments to:
theresa.j.white@faa.gov

Deliver comments by mail or hand to:
Federal Aviation Administration
Transport Airplane Directorate
Transport Standards Staff, ANM-113
1601 Lind Ave. SW
Renton, WA 98057

Fax comments to:
425-227-1232
Document Title: Transport Airplane Cabin Interiors Crashworthiness Handbook
Summary: This change clarifies guidance for the head strike zone, to standardize application of the head strike zone when showing compliance to Title 14, Code of Federal Regulations (14 CFR) 25.785(b) and (d).
Documents for Download: Draft Document (MS Word)
Reference: See Summary
Comments Due: April 6, 2015
How to Comment: Email comments to:
Valerie.Smith@faa.gov

Fax comments to:
425-227-1320
Document Title: Airborne Software Assurance Topics
Summary: This AC provides guidance to help you comply with the software aspects of the applicable airworthiness regulations and is in addition to the assurance processes described in DO-178C and DO-178B. Most of the guidance contained in this AC has been extracted from FAA Order 8110.49 change 1, Software Approval Guidelines, and from issue papers that have been applied to specific type certification programs. If you are using DO-178C or DO-178B (hereafter referred to as DO-178C/B) for software assurance, you should determine which chapters apply to your project, and use the guidance contained therein.
Documents for Download: Draft Document (PDF)
Draft Document Comment Grid (MS Excel)
Reference:
Comments Due: April 18, 2015
How to Comment: Email comments to:
richard.spencer@faa.gov

Deliver comments by mail or hand to:
Federal Aviation Administration
Design, Manufacturing, & Airworthiness Division
Aircraft Certification Service
System and Equipment Standards Branch AIR-130
470 L'Enfant Plaza, SW, Ste. 4102
Washington, DC 20024

Fax comments to:
202-267-8589
Document Title: AC 33.90-1A, Initial Maintenance Inspection (IMI), 14 CFR § 33.90, Test for Turbine Engines
Summary: This advisory circular (AC) provides guidance for demonstrating compliance with the test requirements of Title 14 of the Code of Federal Regulations (14 CFR) 33.90, Initial maintenance inspection.
Documents for Download: Draft Document (MS Word)
Draft Document Comment Grid (MS Word)
Summary of Revisions (PDF)
Reference: 14 CFR 33.90
Comments Due: May 8, 2015
How to Comment: Email comments to:
alan.strom@faa.gov

Deliver comments by mail or hand to:
Federal Aviation Administration
Engine and Propeller Directorate
Standards Staff, ANE-111
12 New England Executive Park
Burlington, MA 01803

Fax comments to:
781-238-7199