ASTM F2490 - 05(2013)

    Standard Guide for Aircraft Electrical Load and Power Source Capacity Analysis

    Active Standard ASTM F2490 | Developed by Subcommittee: F39.01

    Book of Standards Volume: 15.11


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    ASTM F2490

    Significance and Use

    4.1 To show compliance with 14 CFR 23.1351, you must determine the electrical system capacity.

    4.2 14 CFR 23.1351(a)(2) states that:

    4.2.1 For normal, utility, and acrobatic category airplanes, by an electrical load analysis or by electrical measurements that account for the electrical loads applied to the electrical system in probable combinations and for probable durations; and

    4.2.2 For commuter category airplanes, by an electrical load analysis that accounts for the electrical loads applied to the electrical system in probable combinations and for probable durations.

    4.3 The primary purpose of the electrical load analysis (ELA) is to determine electrical system capacity (including generating sources, converters, contactors, bus bars, and so forth) needed to supply the worst-case combinations of electrical loads. This is achieved by evaluating the average demand and maximum demands under all applicable flight conditions. A summary can then be used to relate the ELA to the system capacity and can establish the adequacy of the power sources under normal, abnormal, and emergency conditions.

    Note 1The ELA should be maintained throughout the life of the aircraft to record changes to the electrical system, which may add or remove electrical loads to the system.

    4.4 The ELA that is produced for aircraft-type certification should be used as the baseline document for any subsequent changes. When possible, the basic format of the original ELA should be followed to ensure consistency in the methodology and approach.

    4.5 The original ELA may be lacking in certain information, for instance, time available on emergency battery. It may be necessary to update the ELA using the guidance material contained in this guide.

    1. Scope

    1.1 This guide covers how to prepare an electrical load analysis (ELA) to meet Federal Aviation Administration (FAA) requirements.

    1.2 The values given in SI units are to be regarded as the standard.

    1.3 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 and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    FAA Aeronautics and Space Airworthiness Standards

    14CFR135.163 Operating Requirements: Commuter and On Demand Operations and Rules Governing Persons on Board Such Aircraft--Equipment Requirements: Aircraft Carrying Passengers under IFR


    ICS Code

    ICS Number Code 49.060 (Aerospace electric equipment and systems)

    UNSPSC Code

    UNSPSC Code 25202000(Aircraft power systems)


    DOI: 10.1520/F2490

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