MIL-HDBK-274 Electrical Grounding For Aircraft SafetyThis handbook has been prepared to provide U.S. Navy and Marine Corps aircraft maintenance and operations personnel with the background and technical details of the different types of aircraft grounds and how they are applied. In addition, this handbook provides background information for aircraft grounding, static electricity theory and how it affects aircraft, and techniques used for measurement of grounding points. This handbook is intended for use by all U.S. Navy and Marine Corps aircraft maintenance and operations personnel for the purposes of ensuring that aircraft are properly and safely grounded. This handbook is for guidance only and cannot be cited as a requirement.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 - 32 - 33 - 34 - 35 - 36 - 37 - 38 - 39 - 40 - 41 - 42 - 43 - 44 - 45 - 46 - 47 - 48 - 49 - 50 - 51 - 52 - 53 - 54 - 55 - 56 - 57 - 58 - 59 - 60 - 61

MIL-HDBK-274A

2.	APPLICABLE DOCUMENTS	1
2.1	General	1
2.2	Government documents	1
2.3	Non-Government publications	3

3.	DEFINITIONS, ACRONYMS, AND ABBREVIATIONS	4
3.1	Definitions	4
3.2	Acronyms and abbreviations	5

4.	GENERAL GUIDANCE	7
4.1	Theoretical basis for aircraft grounding	7
4.2	Electrostatic theory	7
4.3	Scenarios	7
4.4	Energy sources	7
4.4.1	Static energy sources	8
4.4.2	Power	14
4.4.3	Summary	25
4.5	Airframe/personnel electrical parameters	25
4.5.1	Electrostatic charge storage	25
4.5.2	Electrical properties of aircraft	26
4.5.3	Aircraft resistance	26
4.5.4	Aircraft tire resistance	26
4.5.5	Runway material	26
4.5.6	Aircraft capacitance	26
4.5.7	Human body electric parameters	26
4.5.8	Aircraft or capacitor discharge	27
4.5.9	Discoordination threshold levels	27
4.6	Damage threshold levels	27
4.6.1	Ordnance	27
4.6.2	Sources of injury from shock	27

iii