Operational Authorization Process for Use of Data Link Communication System
This advisory circular (AC) applies to all operators conducting data link operations and presents various methods for all air operators using data link systems to meet Federal Aviation Administration (FAA) and International Civil Aviation Organization (ICAO) Standards, to include as well-recommended practices. The AC introduces U.S. domestic Controller-Pilot Data Link Communication Departure Clearances (CPDLC-DCL) and the European LINK 2000+ CPDLC program. This revision also incorporates an expanded description of event reporting and defines the roles and responsibilities during the authorization process. It provides operational approval information for operators conducting operations under Title 14 of the Code of Federal Regulations (14 CFR) parts 91, 91 subpart K (part 91K), 121, 125, 129, 133, and 135. For complete airworthiness guidance for new aircraft and systems, refer to the current edition of AC 20-140, Guidelines for Design Approval of Aircraft Data Communications Systems Supporting Air Traffic Services (ATS). Authorizations to conduct data link operations approved under previous versions of AC 120-70 do not require further evaluation.
Selection of Cyclic Redundancy Code and Checksum Algorithms to Ensure Critical Data Integrity
This advisory circular (AC) provides information about the availability of resource material on digital data integrity. This information is in the form of a research report entitled "Selection of Cyclic Redundancy Code and Checksum Algorithms to Ensure Critical Data Integrity," DOT/FAA/TC-14/49, dated March 2015. This report is provided for information only and, as such, is not intended as guidance but rather as reference material for the aviation industry.
Nationally Scheduled, FAA Approved, Industry Conducted Flight Instructor Refresher Course
This advisory circular (AC) provides information and standards for the preparation and approval of training course outlines (TCO) for Federal Aviation Administration (FAA)-approved, industry-conducted flight instructor refresher courses (FIRC) in accordance with Title 14 of the Code of Federal Regulations (14 CFR) part 61, § 61.197(a)(2)(iii). The intent of the FIRC program is to keep flight instructors informed of the changing world of General Aviation (GA) flight training and to enhance aviation safety through continued refresher training of the flight instructor cadre. Attending a FIRC is one of several methods by which a flight instructor may renew his or her flight instructor certificate. This AC provides one acceptable method by which the FAA may approve a FIRC program.