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BS EN 4856:2023 – TC

BS EN 4856:2023 – TC

$246.62

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

Published By Publication Date Number of Pages
BSI 2023 108
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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
64 undefined
72 1 Scope
2 Normative references
73 3 Terms and definitions
77 4 Design types
4.1 Compressed air EBS
4.2 Hybrid rebreather EBS
5 Performance requirements
5.1 General
78 5.2 Design
79 5.3 Materials
5.4 Breathing performance
5.4.1 General
80 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
81 5.6 Deployment
5.7 Ease of use and manoeuvrability in water
5.8 Buoyancy
82 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
83 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
84 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
85 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
86 6.5 Breathing performance
88 6.6 Breathable volume of counterlung
89 6.7 Buoyancy
6.8 Ergonomic performance
6.8.1 General
90 6.8.2 Test subjects
92 6.8.3 Deployment
6.8.4 Ease of use, manoeuvrability and helicopter escape
94 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
95 6.10.4 Compatibility and equipment combination performance testing
6.10.5 Donning and fit
6.10.6 Ride-up
96 6.10.7 Helicopter underwater escape
6.10.8 Jump into water
97 6.10.9 Freeboard
6.10.10 Turning
6.10.11 Self-righting
98 6.10.12 In-water stability
6.10.13 Freedom of movement and use of accessories
99 6.10.14 Life raft boarding
6.10.15 Rescue and recovery
6.10.16 Escape buoyancy
100 6.11 Crew equipment compatibility
102 6.12 Reporting
7 Marking
103 8 Information supplied by the manufacturer
104 Annex A (normative)Rating of breathing effort
A.1 Instruction
105 Annex B (informative)Evolution sheet

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BS EN 4856:2023 - TC
$246.62