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150/5210-17C AAS-300 Programs for Training of Aircraft Rescue and Firefighting Personnel

This AC provides information on courses and reference materials for training of Aircraft Rescue and Firefighting (ARFF) personnel. This revision replaces Appendix 1  with an Addendum of Aircraft Rescue and Firefighting (ARFF) Training Facilities, which the FAA will update on a quarterly basis. It also  removes the one minute time requirement for donning of Personal Protective Equipment and the Self-Contained Breathing Apparatus.

120-85A AFS-300 Air Cargo Operations

This advisory circular (AC) provides operators with recommended procedures for managing cargo operations. Developing and using these comprehensive procedures is key to establishing a safe and efficient cargo operation. The AC provides guidance for aircraft cargo loading systems (CLS), restraints, special cargo, and unit load devices (ULD)This AC is not mandatory and does not constitute a regulation. This AC describes an acceptable means, but not the only means, of complying with applicable regulations to manage cargo operations.

  • The terms must and will are used in this AC to reflect regulatory requirements.
  • When this AC uses suggestive and permissive language (e.g., should and may), it is used to describe recommended or acceptable means, but not the only means, to comply with this AC.
90-109A AFS-800 Transition to Unfamiliar Aircraft

This advisory circular (AC) is intended to help plan the transition to any unfamiliar fixed-wing airplanes, including type-certificated (TC) and/or experimental airplanes. It provides information and guidance to owners and pilots of experimental, simple, complex, high-performance, and/or unfamiliar airplanes. It also provides information to flight instructors who teach in these airplanes. This information and guidance contains recommendations for training experience for pilots of experimental airplanes in a variety of groupings based on performance and handling characteristics. This AC does not address the testing of newly built experimental airplanes. The current edition of AC 90-89, Amateur-Built Aircraft and Ultralight Flight Testing Handbook, provides information on such testing. However, if a pilot is planning to participate in a flight test program in an unfamiliar and/or experimental airplane, this AC should be used to develop the skills and knowledge necessary to safely accomplish the test program utilizing the guidance found in AC 90-89.

120-112 AFS-200 Use of Liquid Water Equivalent System to Determine Holdover Times or Check Times for Anti-Icing Fluids

This advisory circular (AC) provides guidance for the Federal Aviation Administration’s (FAA) standard for a Liquid Water Equivalent System (LWES). This AC applies to anyone proposing to design, procure, construct, install, activate, or maintain an LWES. An LWES is an automated weather measurement system that determines the Liquid Water Equivalent (LWE) rate in conditions of frozen or freezing precipitation. The LWE rate is used by the system with the appropriate endurance time (ET) regression equations and regression coefficients specified in an FAA-approved current database at to determine the holdover time (HOT) or check time (CT) for an aircraft’s applied anti-icing fluid (Society of Automotive Engineer (SAE) Types I, II, III, and IV). Thus, the LWES incorporates a Holdover Time Determination System (HOTDS) or Check Time Determination System (CTDS). The HOT is used to determine how long a fluid would provide protection assuming that the current conditions do not change. The CT is used to determine the fluid’s current protection capability, while incorporating varying weather conditions.


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