International Organization for Standardization (ISO)
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ISO 1540:2006
Scope
This International Standard specifies the characteristics of electrical power supplied to the terminals of
electrical utilization equipment installed in an aircraft. It is intended to support the interface definition for user
equipment designed to accept electrical power on a variety of new civil aircraft applications, such as those
certified via the Technical Standard Order (TSO) certification process. It might not be desirable for equipment
targeted to a single application or specific military application to follow this International Standard because of
the penalties associated with multi-application.
This document also attempts to provide background to the development of these requirements that may be
useful to those designing and/or integrating modern aircraft electrical systems. The delivered quality of this
electrical power is a result of the combined characteristics of the electrical power source, distribution and user
equipment. While only user equipment restrictions are specifically defined, background to key source and
distribution equipment interfaces are identified in order to support development of the overall system.
A wide variety of electrical supply types and distribution parameters have been considered, as may be found
on both small and large transport aircraft. Sources considered include physically rotating and static types,
provided either on-aircraft, or as part of the ground support equipment. Distribution voltages addressed are
⎯ nominal 14 V, 28 V and 42 V d.c.;
⎯ nominal 26 V a.c., 400 Hz, one-phase;
⎯ nominal 115/200 V rms and 230/400 V rms a.c., both one-phase and three-phase, at either a nominal
400 Hz constant frequency (CF), or over a variable frequency (VF) range which includes 400 Hz.
ISO 1540:2006 Referenced Document
ISO 6858 Aircraft — Ground support electrical supplies — General requirements*, 2017-12-06 Update
ISO 7137:1995 Aircraft - Environmental conditions and test procedures for airborne equipment
ISO 1540:2006 history
2006ISO 1540:2006 Aerospace - Characteristics of aircraft electrical systems
1984ISO 1540:1984 Aerospace; Characteristics of aircraft electrical systems
1977ISO 1540:1977 Aerospace — Characteristics of aircraft electrical systems