W/D NO S/S
The purpose of this document is to provide equipment andaircraft manufacturers with guidance concerning the characteristicsand utilization of aircraft electrical power. This material willcover, in addition to the description of basic powercharacteristics, detailed guidance setting forth the airline needsfor transient protection, interference control, and basic designconsiderations for both equipment and installations
This document is intended to better acquaint the equipmentdesigner with the electrical power systems employed in transportaircraft. A serious need for a better understanding of electricalpower characteristics, and particularly its undesirablecharacteristics, has been evidenced by reoccurring equipment designdeficiencies. Typical deficiencies in the airline equipment includeinadequate supply voltage tolerance, susceptibility to the ripplecontent of DC power and, perhaps the most significant, theinability to survive voltage transients. Although many of theseproblems were well known or predicted by the aircraft electricalsystem designers, some equipment designers who are rather new tothe commercial avionics field have all too frequently failed torecognize the existence of such basic problems. Although the oldtimers have learned the solutions to these problems the hard wayafter spending a lot of money in the redesign and modification ofequipment which went into airline service, the wider and broaderapplication of solid state electronic equipment to airline aircrafthas brought a large number of manufacturers into the field and theairlines do not wish to serve as a proving ground while all thesemanufacturers learn the necessary design pitfalls.
At the same time there is a need to acquaint the airframedesigner, particularly the electronic equipment installationdesigner, with the techniques employed by the knowledgeableequipment designer in reaching the inevitable engineeringcompromises required to optimize the equipment performance in theface of the known power system characteristics and limitations.This need is evidenced by the installation where suitably designedequipment fails to meet the operational needs of the customer as aconsequence of an improper application.
We are all learning rapidly as the solid state equipment logsmore and more hours; this document attempts to record for posteritythe important points established thus far there will be morelater.
- Edition:
- 67
- Published:
- 05/01/1967
- Number of Pages:
- 146
- File Size:
- 1 file , 5.9 MB
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