Standard Historical Last Updated: Sep 18, 2023 Track Document
ASTM F3331-18

Standard Practice for Aircraft Water Loads

Standard Practice for Aircraft Water Loads F3331-18 ASTM|F3331-18|en-US Standard Practice for Aircraft Water Loads Standard new BOS Vol. 15.09 Committee F44
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Significance and Use

4.1 This practice provides one means for determining the aeroplane structural loads for either dual floats or single hulls when taxiing on, taking off from, or landing on water. This practice satisfies the water loads requirements set forth in the Design Loads and Conditions Specification for Normal Category Aeroplanes.


1.1 This practice provides equations for calculating water loads for aeroplane dual floats and single hulls. The material was developed through open consensus of international experts in general aviation. This information was created by focusing on Level 1, 2, 3, and 4 Normal Category aeroplanes. The content may be more broadly applicable; it is the responsibility of the Applicant to substantiate broader applicability as a specific means of compliance.

1.2 An applicant intended 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 CAAs) concerning the acceptable use and application thereof. For information on which oversight authorities have accepted this standard (in whole or in part) as an acceptable Means of Compliance to their regulatory requirements (hereinafter “the Rules”), refer to ASTM Committee F44 web page (

1.3 Units—The values stated in inch-pound units are to be regarded as standard.

1.4 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.

1.5 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.

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Book of Standards Volume: 15.09
Developed by Subcommittee: F44.30
Pages: 5
DOI: 10.1520/F3331-18
ICS Code: 49.020