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Number Office Title Date
91-50 AFS-820 Importance of Transponder Operation and Altitude Reporting Provides information and guidance concerning the importance of transponder operation and altitude reporting in the National Airspace System. 08-24-1977
43-15 AFS-350 Recommended Guidelines for Instrument Shops Provides guidelines concerning environmental conditions for instrument repair and overhaul shops and information on calibration of test equipment. Provides information on obtaining printed copies of this document or electronic access to it. Provides information on obtaining printed copies of this document or electronic access to it. 08-15-1977
120-34 AFS-220 Air Transportation of Mental Patients Provides guidelines to organizations and persons responsible for transportation of mental patients and outlines the responsibilities of those escorting such persons. 06-29-1977
91-48 AFS-820 Acrobatics-Precision Flying with a Purpose Provides information to persons who are interested in acrobatic flying to improve their piloting skills as recreation, sport, or as a competitive activity. 06-29-1977
120-33 AFS-400 Operational Approval of Airborne Long-Range Navigation Systems for Flight within the North Atlantic Minimum Navigation Performance Specifications Airspace Sets forth acceptable means, but not the only means, for operators certificated under FAR Parts 121 and 123 and operators utilizing large aircraft under FAR 135.2, to obtain approval to operate within a specific airspace over the NAT (North Atlantic) MNPS (Minimum Navigation Performance Specifications) airspace after 0001 Greenwich Mean Time, Dec. 29, 1977. 06-24-1977
20-99 ANM-100 Antiskid and Associated Systems Provides an acceptable means, but not the only means, of complying with the requirement that anti-skid and associated systems must be designed so that no probable malfunction will result in a hazardous loss of braking or directional control of an airplane. 05-27-1977
20-41A AIR-120 Substitute Technical Standard Order (TSO) Aircraft Equipment Sets forth an acceptable means for complying with rules governing aircraft equipment installations in cases involving the substitution of technical standard order equipment for functionally similar TSO approved equipment. 04-05-1977
120-32 AFS-223 Air Transportation of Handicapped Persons Identifies some of the problems handicapped air travelers face and provides some guidelines to airline personnel to help alleviate these problems. 03-25-1977
43-14 AFS-350 Maintenance of Weather Radar Radomes Provides guidance material useful to repair facilities in the maintenance of weather radomes. 02-24-1977
90-75 AFS-310 Strobe Light System Inspection Advises the general aviation community of the importance of proper maintenance of capacitive discharge strobe light systems which are installed within or near fuel systems. 02-10-1977
91-46 AFS-350 Gyroscopic Instruments - Good Operating Practices Issued to re-emphasize to general aviation instrument-rated pilots the need to determine the proper operation of gyroscopic instruments, the importance of instrument crosschecks and proficiency in partial-panel operations. 02-04-1977
25.253-1A ANM-110A High-Speed Characteristics Sets forth an acceptable means, but not the only means, by which compliance may be shown with FAR 25.253 during certification flight tests. 12-27-1976
20-96 AIR-200 Surplus Military Aircraft: A Briefing for Prospective Buyers Provides many answers to questions regarding the purchasing of surplus military aircraft (type certification, is the aircraft flyable, is it sold for spare parts, scrap?). 12-02-1976
20-43C AFS-340 Aircraft Fuel Control Alerts the aviation community to the potential hazards of inadvertent mixing or contamination of turbine and piston fuels, and provides recommended fuel control and servicing procedures. 10-20-1976
120-30A AFS-830 Reporting Requirements of Air Carriers, Commercial Operators, Travel Clubs, and Air Taxi Operators of Large and Small Aircraft Clarifies the mechanical reliability reporting requirements contained in Parts 121, 127, and 135 of the Federal Aviation Regulations (FAR) and the accident and incident reporting requirements of Part 830 (old Part 430) of the National Transportation Safety Board (NTSB), Safety Investigation Regulations. 09-08-1976
145-2 AFS-340 Repair Station Limited Ratings Beech 18 Series Aircraft Advises of a required limited repair station rating to perform X-ray inspection of the Beech 18 wing and center section spar, and of the procedures for application. 04-21-1976
135-4A ACS-100 Aviation Security: Air Taxi Commercial Operators (ATCO) Provides recommended security measures applicable to ATCO operations that should minimize the effects of crimes directed against air transportation. 04-15-1976
43-11 AFS-340 Reciprocating Engine Overhaul Terminology and Standards
CHANGE 1 (03-30-2007)
65-12A AFS-630 [Large AC] Airframe and Powerplant Mechanics Powerplant Handbook

Designed to familiarize student mechanics with the construction, theory of operation, and maintenance of aircraft powerplants. SN 050-007-00373-1

65-15A AFS-630 [Large AC] Airframe and Powerplant Mechanics Airframe Handbook

Designed to familiarize student mechanics with airframe construction, repair, and the operating theory of airframe systems. SN 050-007-00391-9

150/5050-4 APP-400 Citizen Participation in Airport Planning

Provides guidance for citizen involvement in airport planning. Although not mandatory for airport grant programs, it explains the need for early citizen participation.

Note: Portions of this AC are under review for update. Please contact the appropriate Regional Office or Airports District Office for assistance.

20-33B AIR-100 Technical Information Regarding Civil Aeronautics Manuals 1, 3, 4a, 4b, 5, 6, 7, 8, 9, 13, and 14 Advises the public that policy information contained in the subject Civil Aeronautics Manuals may be used in conjunction with specific sections of the Federal Aviation Regulations. 05-01-1975
90-58C AFS-310 VOR Course Errors Resulting from 50 kHz Channel Mis-Selection Provides information concerning a potentially hazardous situation when a 200 channel VOR receiver is inadvertently mistuned by 50 kHz from the frequency of a 100 kHz ground station. 04-07-1975
20-56A AIR-120 Marking of TSO-C72b Individual Flotation Devices Outlines acceptable methods for marking individual flotation devices which also serve as seat cushions 04-01-1975
90-45A AFS-400 Approval of Area Navigation Systems for use in the U.S. National Airspace System

Provides guidelines for implementation of two-dimensional area navigation (2D RNAV) within the U.S. National Airspace System (NAS). Provides for both VOR/DME dependent systems and self-contained systems such as Inertial Navigation Systems (INS).

AC 20-138C - Airworthiness Approval of Positioning and Navigation Systems supersedes the airworthiness considerations in AC 90-45A, Approval of Area Navigation Systems for use in the U.S. National Airspace System. Equipment previously approved per the airworthiness guidance in AC 90-45A is still valid for the operations and conditions stated in their approvals.



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