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  • ASTM
    F3491-21 Standard Practice for Enhanced Indication Methods in Aircraft
    Edition: 2021
    $68.64
    Unlimited Users per year

Description of ASTM-F3491 2021

ASTM F3491-21

Active Standard: Standard Practice for Enhanced Indication Methods in Aircraft




ASTM F3491

Scope

1.1 This practice provides methods for how Enhanced Indications are provided to the responsible crewmember when an applicant uses these indications in support of compliance with the requirements for Stall Characteristics, Stall Warning, and Spins applicable to Normal Category Aeroplanes, using Specification F3180/F3180M.

1.2 The specific types of enhanced indications identified in Specification F3180/F3180M are as follows:

Type

Description

 

 

Angle of Attack

Angle of attack indication

Angle of Attack

Angle of attack indication with trend marker

Pitch Limit

Pitch limit indication displayed on attitude indication

Dynamic Low-Speed Markings

Indicated airspeed markings that change with flight condition

Airspeed Trend

Indicated airspeed trend marker displayed on airspeed indication

Flight Path Marker

Flight path marker displayed on attitude indication

LOC Alert

Alert issued when loss of control likely within trend window

1.3 An applicant intending to propose this information as Means of Compliance for a design approval must seek guidance from their respective oversight authority (for example, published guidance from applicable civil aviation authority (CAA) concerning the acceptable use and application thereof. For information on which oversight authorities have accepted this practice (in whole or in part) as an acceptable Means of Compliance to their regulatory requirements (hereinafter “the Rules”), refer to the ASTM Committee F44 web page (www.astm.org/COMMITTEE/F44.htm).

1.4 Units—This document may present information in SI units, English Engineering units, or both. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


Keywords

alert; dynamic; enhanced indication; indication; symbology;


ICS Code

ICS Number Code 49.020 (Aircraft and space vehicles in general)


DOI: 10.1520/F3491-21

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About ASTM

ASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide.
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