An engineering investigation of airframe electrical grounding requirements, methods, and facilities has been made to resolve present conflicts and to establish a basic grounding philosophy. Based on an evaluation of data, a technical committee concluded that it is necessary to continue and extend the use of airframe electrical grounding for reasons of both personnel safety and equipment protection. The committee also concluded that the present static ground impedance requirements are too stringent, resulting in unnecessarily costly grounding systems. Aircraft mooring padeyes located on parking aprons measured less than 10,000-ohm resistance to earth and are recommended as a static ground attachment point. It was also found that for external power grounding, the existing requirements are vague and may be unsafe when not based on an analysis of total power requirements and circuit protection levels. Additional guidelines are recommended for electrical ground systems when external power is connected to the aircraft or used near it. Some problems which were considered relevant to the grounding study were investigated even though the resolution of these problems was beyond the scope of the program. These problem areas are cited herein to document pertinent data and to indicate possible direction for future efforts. The areas include hardware, power fault systems, fuel additives, specifications and documentation, and composite material, each bearing on aircraft safety with respect to electrical hazards.
Airframe Electrical Grounding Requirements Program. Volume 1
1981
46 pages
Report
Keine Angabe
Englisch
Aircraft , Resistive, Capacitive, & Inductive Components , Electrical grounding , Airframes , Mooring , Electrical resistance , Faults , Composite materials , Engineering , Statics , External , Electrical properties , Attachment , Fuel additives , Safety , Power , Protection , Requirements , Electrical equipment , Hazards , Impedance , Personnel , Power supplies , Ground level
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