ASTM F2490-05
(Guide)Standard Guide for Aircraft Electrical Load and Power Source Capacity Analysis
Standard Guide for Aircraft Electrical Load and Power Source Capacity Analysis
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.
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Designation:F2490–05
Standard Guide for
Aircraft Electrical Load and Power Source Capacity
1
Analysis
This standard is issued under the fixed designation F2490; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
1.1 This guide covers how to prepare an electrical load 3.1 Definitions of Terms Specific to This Standard:
analysis(ELA)tomeetFederalAviationAdministration(FAA) 3.1.1 abnormal electrical power operation (or abnormal
requirements. operation), n—occurs when a malfunction or failure in the
1.2 The values given in SI units are to be regarded as the electric system has taken place and the protective devices of
standard. the system are operating to remove the malfunction or failure
1.3 This standard does not purport to address all of the fromtheremainderofthesystembeforethelimitsofabnormal
safety concerns, if any, associated with its use. It is the operation are exceeded.
responsibility of the user of this standard to establish appro- 3.1.1.1 Discussion—The power source may operate in a
priate safety and health practices and determine the applica- degraded mode on a continuous basis when the power charac-
bility of regulatory limitations prior to use. teristics supplied to the using equipment exceed normal opera-
tionlimitsbutremainwithinthelimitsforabnormaloperation.
2. Referenced Documents
3.1.2 alternate source, n—secondpowersourcethatmaybe
2
2.1 FAA Aeronautics and Space Airworthiness Standards: used instead of the normal source, usually on failure of the
14 CFR 23.1309 Normal, Utility,Acrobatic, and Commuter
normal source.
Category Airplanes—Equipment, Systems, and Installa- 3.1.2.1 Discussion—The use of alternate sources creates a
tions
new load and power configuration and, therefore, a new
14 CFR 23.1351 Normal, Utility,Acrobatic, and Commuter electrical system that may require separate source capacity
Category Airplanes—General
analysis.
14 CFR 23.1353 Normal, Utility,Acrobatic, and Commuter
3.1.3 cruise, n—condition during which the aircraft is in
Category Airplanes—Storage Battery Design and Instal- level flight.
lation
3.1.4 electrical source, n—electrical equipment that pro-
14 CFR 23.1419 Normal, Utility,Acrobatic, and Commuter duces, converts, or transforms electrical power.
Category Airplanes—Ice Protection
3.1.5 electrical system, n—consists of an electrical power
14 CFR 23.1529 Normal, Utility,Acrobatic, and Commuter source, the electrical wiring interconnection system, and the
Category Airplanes—Instructions for Continued Airwor-
electrical load(s) connected to that system.
thiness 3.1.6 emergency electrical power operation (or emergency
14 CFR 91 General Operating and Flight Rules
operation), n—condition that occurs following a loss of all
14 CFR 135.163 Operating Requirements: Commuter and normalelectricalgeneratingpowersourcesoranothermalfunc-
On Demand Operations and Rules Governing Persons on
tion that results in operation on standby power (batteries or
Board Such Aircraft—Equipment Requirements: Aircraft other emergency generating source such as an auxiliary power
Carrying Passengers under IFR
unit (APU) or ram air turbine (RAT)) only, or both).
3.1.7 ground operation and loading, n—time spent in pre-
paring the aircraft before the aircraft engine starts.
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3.1.7.1 Discussion—During this period, the APU, internal
This guide is under the jurisdiction of ASTM Committee F39 on Normal and
Utility CategoryAirplane Electrical Wiring Systems and is the direct responsibility
batteries,oranexternalpowersourcesupplieselectricalpower.
of Subcommittee F39.01 on Design, Alteration, and Certification.
3.1.8 landing, n—condition starting with the operation of
Current edition approved Oct. 1, 2005. Published October 2005.
2
navigational and indication equipment specific to the landing
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732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401. approach and following until the completion of the rollout.
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F2490–05
3.1.9 nominal rating, n—this rating of a unit power source 5. Basic Principles
is its nameplate rating and is usually a continuous duty rating
5.1 Aloadanalysisisessentiallyasummationoftheelectric
for specified operating conditions.
loadsappliedtotheelectricalsystemduringspecifiedoperating
3.1.10 normal ambient conditions, n—typical operating
conditions of the aircraft. The ELArequires the listing of each
conditions such as temp
...
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