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As flight systems evolve from traditional hydraulic, to electrically-controlled/hydraulically powered, to electrically (or optically) controlled/electrically powered, one of the key design requirements for

new power generation will be the ability to provide high-quality power at variable frequencies. 

An equally important requirement will be for electrical equipment and systems to be able to utilize

the wide variable frequency (or “Wild” frequency) of 350 to 800 Hz that is output by the

variable frequency generators. In addition, ground support and test equipment capable of producing

and handling “Wild” frequencies will be required.


Read the article in January 2007 Avionics magazine titled:

Perspectives: "Wild" Frequency must move toward wide acceptance


See the results of the survey:

Electrical Power trends in the military and civilian aircraft industry


Questions from readers with answers from our wild frequency experts


What exactly is wild frequency?

Mike T. MT


I  thought 400 Hz was the AC standard on all aircraft?

Jim W.  OH


What will happen to all the existing avionics that are powered from 115VAC, 400Hz?

Peter R. NY


Is there any equipment presently being manufactured that works at the wild frequency?

Gary V. PA


Are there any MIL Specs for wild frequency requirements?

George B. CA



Information and products regarding wild frequency


High-Performance Front-End Converter for Avionics Application

This paper presents analysis, modeling, and design of a low-harmonic, isolated, active-clamped SEPIC rectifier for future avionics applications. Simpler converter dynamics, high switching frequency,

zero-voltage-switching, and a single-layer transformer construction result in an efficiency of 90% and

a very low harmonic distortion over 400-800 Hz line frequency variation.


Questions and answers on "Origin of 400 Hz in aircraft"?


Demonstration of Very High Power Airborne AC to DC Converter

This paper describes the challenges inherent in developing high power (>100kW) AC-DC converters for aerospace applications. Various technologies and topologies were considered, analyzed and rated,

with an optimum design being chosen. Details regarding power quality, magnetics design, and thermal management are discussed. Performance results from demonstration hardware are provided, including

power quality, regulation, efficiency (98%) and temperature results.


End of the circuit breaker: smart power makes its mark

Computer control of power distribution on aircraft and other integrated platforms is helping systems integrators improve reliability, safeguard sophisticated electronics from power spikes, and protect

not only aircraft and other expensive military and aerospace systems, but also the men and women

who operate them. An AIRINC 429 Tutorial


SAE AE-7 Committee Minutes 29 April-1 May 2003

SAE AE-7 5 year document review list. A 5-year review of AS 8023 is required. The committee needs

to get a handle on which SAE documents are in active use. Only keep 5-year review for active

document. Discussion on AS 1212 Electric Power Systems, Characteristics vs. MIL STD 704: 704 is accepted as is DO-160. Has AS 1212 lost its importance?...


Some questions about " MAGNESIUM OVERCAST- The story of the Convair B-36"

by Dennis R. Jenkins


For members of IEEE

    High-power variable frequency generator for large civil aircraft

    Fault tolerant, variable, unity power factor converters for aircraft power systems


Converter enhanced variable frequency power bus architecture


Unity power factor power supply for use with variable frequency power


Aircraft power supply 400 Hz and beyond


The role of avionics in the all electric airplane

Available for purchase from the Electronic Library of AIAA


Personnel Licensing Advisory Circular

Aircraft Maintenance Technician Licenses Type Ratings


Goodrich On Board A400M

Airbus has selected Goodrich Corporation to supply the flap actuation package for its military transport aircraft,....


Data Recording Products

A wide range of data recording products with power test capability to 800 Hz


Anti-Collision Light System

Anti-collision light system based on LED technology that operates on 115 VAC form 360-800 Hz


Hi-Rel AC/DC Module

Active Power Factor Corrected over variable frequency 360-800 Hz


Airline Control Boxes

Can drive up to 10 standard actuators, up to 16 BUS actuators...power supply frequency 360-800 Hz


Ice Protection Systems

Products ranging from ice protection systems, both anti-icing and de-icing, to avionic systems

and system monitoring equipment. Technologies include wild frequency.



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