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BS EN 4856:2023

BS EN 4856:2023

$189.07

Aerospace series. Rotorcraft Emergency Breathing Systems (EBS). Requirements, testing and marking

Published By Publication Date Number of Pages
BSI 2023 46
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This document specifies requirements for Emergency Breathing Systems (EBS) for use by helicopter crew and passengers in the event of a ditching or water impact, to ensure minimum levels of performance. It applies to EBS capable of being successfully and reliably deployed in air and underwater, for use by adults only. This document is applicable to compressed air and hybrid rebreather designs of EBS. It does not apply to EBS that cannot be successfully and reliably deployed underwater.

PDF Catalog

PDF Pages PDF Title
2 undefined
10 1 Scope
2 Normative references
11 3 Terms and definitions
15 4 Design types
4.1 Compressed air EBS
4.2 Hybrid rebreather EBS
5 Performance requirements
5.1 General
16 5.2 Design
17 5.3 Materials
5.4 Breathing performance
5.4.1 General
18 5.4.2 Work of breathing
5.4.3 Respiratory pressures
5.4.4 Hydrostatic imbalance
5.4.5 Extreme cold water temperatures
5.5 Safety devices
19 5.6 Deployment
5.7 Ease of use and manoeuvrability in water
5.8 Buoyancy
20 5.9 Cold water performance
5.10 Compatibility
5.10.1 General
5.10.2 Performance of equipment combination(s)
5.10.2.1 General
5.10.2.2 Donning and fit
5.10.2.3 Ride-up
21 5.10.2.4 Helicopter escape
5.10.2.5 Jump into water
5.10.2.6 Freeboard
5.10.2.7 Turning
5.10.2.8 Self-righting
22 5.10.2.9 In-water stability
5.10.2.10 Freedom of movement and use of accessories
5.10.2.11 Life raft boarding
5.10.2.12 Rescue and recovery
23 5.10.2.13 Escape buoyancy
6 Testing
6.1 Visual inspection
6.2 Nominal values and tolerances
6.3 Magnetic properties testing
6.4 Temperature cycling
24 6.5 Breathing performance
26 6.6 Breathable volume of counterlung
27 6.7 Buoyancy
6.8 Ergonomic performance
6.8.1 General
28 6.8.2 Test subjects
30 6.8.3 Deployment
6.8.4 Ease of use, manoeuvrability and helicopter escape
32 6.9 Cold water performance
6.10 Compatibility and performance of equipment combination(s)
6.10.1 General
6.10.2 Test subjects
6.10.3 Clothing
33 6.10.4 Compatibility and equipment combination performance testing
6.10.5 Donning and fit
6.10.6 Ride-up
34 6.10.7 Helicopter underwater escape
6.10.8 Jump into water
35 6.10.9 Freeboard
6.10.10 Turning
6.10.11 Self-righting
36 6.10.12 In-water stability
6.10.13 Freedom of movement and use of accessories
37 6.10.14 Life raft boarding
6.10.15 Rescue and recovery
6.10.16 Escape buoyancy
38 6.11 Crew equipment compatibility
40 6.12 Reporting
7 Marking
41 8 Information supplied by the manufacturer
42 Annex A (normative)Rating of breathing effort
A.1 Instruction
43 Annex B (informative)Evolution sheet

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BS EN 4856:2023
$189.07