Provides information relating to the substantiation of ice protection systems on aircraft.

Provides information and guidance regarding airworthiness and operational approval of airborne equipment/systems in accordance with FAR 135.153(b) and (c).

Establishes an acceptable means, but not the only means, of obtaining airworthiness approval of an airborne vertical navigation system for use under visual flight rules (VFR) and instrument flight rules (IFR) within the conterminous United States, Alaska and surrounding U.S. waters.

Sets forth an acceptable means, but not the sole means, of complying with the requirements of the Federal Aviation Regulations (FAR’s) applicable to the installation on transport category airplanes of cargo load devices approved as meeting the criteria in NAS 3610.

Establishes an acceptable means of obtaining airworthiness and operational approval of Airborne Omega Navigational Systems as a sole means of long range navigation for operations conducted outside the United States in accordance with FAR 121, 123, or large aircraft operated under FAR 135.2.

a. This AC describes an acceptable means, but not the only means, for showing compliance with the applicable airworthiness regulations for the software aspects of airborne systems and equipment certification.

Describes the public procedure the Federal Aviation Administration (FAA) will use to develop and issue Technical Standard Orders (TSOs) for aeronautical articles to be used on civil aircraft.

Establishes an acceptable means, but not the only means, of obtaining airworthiness approval of airborne Loran-C navigation systems for use under VFR (visual flight rules) and IFR (instrument flight rules) within the conterminous United States, Alaska, and surrounding U.S. waters.

Provides information on approvals required for modifications to TSO’d seating systems. This revision incorporates guidance regarding TSO-C127 seating systems and additional information on marking and flammability testing requirements.

This advisory circular (AC) explains the technical standard order (TSO) process outlined in Title 14 of the Code of Federal Regulations (14 CFR), part 21, Subpart O, for manufacturers producing articles and appliances under a TSO authorization (TSOA) or letter of TSO design approval (LODA).