BS G 257-2:1998
Current
The latest, up-to-date edition.
Design of electromagnetic hazard protection of civil aircraft Guide to protection
Hardcopy , PDF
English
15-03-1998
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Committees responsible
Foreword
Guide
1 Scope
2 Informative references
3 Design of the airframe
4 Design of the system installation
5 Design of the equipment
Tables
1 Bond resistances
2 Typical signal classifications for the purposes of
cable segregation
3 Recommended types of cables for particular applications
Figures
1 The effect of airframe geometry on airframe current to
effect coupling
2 Airframe geometries which will provide useful protection
3 Preferred cable routes in a typical front fuselage
section
4 Parallel and normal electric field components
5 Screening mechanism against electric field component
6 Magnetic field component coupling with a cable loop
7 Magnetic field null at screen centre
8 The definition of cable surface transfer impedance
9 Test arrangement for surface transfer impedance
measurement
10 Typical surface transfer impedance values for cable
measured in figure 9
11 Three simple options for screen and equipment bonding
12 Resistive earth planes or poor bonding drives earth
currents along screens
13 Possibilities for video signalling
14 Summary of cable screen terminations
15 The effect of pigtail terminations
16 Possibilities for OV referencing
17 Equipment case protection
18 Inter-winding capacitance reduction
19 Typical unbalanced input
20 Optical isolator installation
21 Earthing philosophies
22 Combined filter and surge arrestor
23 Filter installation
24 Gasket installation in bolted joints
25 Gasket installation in access panel
26 Common impedance and its alleviation
27 Board layout guidelines
28 OV and supply track vee layout
29 Mounting of continuous decoupling capacitors
List of references
This guide identifies design and development practice that should optimize airframe and system protection, and minimize the cost, weight and volume penalties of providing protection.
| Committee |
ACE/6
|
| DevelopmentNote |
Supersedes 94/714809 DC. (06/2005) Reviewed and confirmed by BSI, January 2011. (12/2010)
|
| DocumentType |
Standard
|
| Pages |
46
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
This Part of this British Standard provides guidance on the design features of airframes and system installations necessary to achieve an acceptable level of EMH protection in a hostile EM environment.
| BS G 257-3:2004 | Design of electromagnetic hazard protection of civil aircraft Guide to clearance and testing |
| BS G 257-1:1998 | Design of electromagnetic hazard protection of civil aircraft Guide to theory and threats |
| BS G 257-3:2004 | Design of electromagnetic hazard protection of civil aircraft Guide to clearance and testing |
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