What safety measures should be in place for oxygen re-charging systems on large aeroplanes?

Re-charging systems should prevent excessive charging rates and protect against contamination.

What considerations are important when using chemical oxygen generators in large aeroplanes?

The effects of heat emission during normal and inadvertent operation on the installation and adjacent equipment should be taken into account.

Where should in-situ charging facilities be located, and what signage is required?

In-situ charging facilities should be accessible from outside the aircraft, remote from other service points, and have placards with precautions for charging.

How should oxygen system components and pipelines be installed to ensure safety?

Components and pipelines should be separated from electrical and fluid systems, routed to minimize joints and bends, clear of moving controls, protected against grease and vibration, and assembled with approved sealing compounds.

What ventilation and protection requirements exist for compartments housing high-pressure oxygen system components?

Compartments should have adequate ventilation for rapid dilution of leaked oxygen and protection against contamination by liquids and other products.

AMC 25.869(c) Fire Protection for Oxygen Equipment

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ED Decision 2003/2/RM

1 High-pressure shut-off valves should be designed to provide effective slow opening and closing, so as to avoid the possible risk of fire or explosion.

2 Re-charging systems, if installed, should be provided with means to prevent excessive rates of charging which could result in dangerously high temperatures within the system. The charging system should also provide protection from contamination.

3 The compartments in which high-pressure system components, including source(s) are located should have adequate ventilation to ensure the rapid dilution of leaked oxygen. Such compartments should also provide adequate protection against contamination by liquids and other products which could result in the risk of fire.

4 Where in-situ charging facilities are provided, the compartments in which they are located should be accessible from outside the aircraft and as remote as possible from other service points and equipment. Placards should be provided, located adjacent to the servicing point, with adequate instructions covering the precautions to be observed when the system is being charged.

5 The installation of the system should be such that components and pipe lines –

a. Are adequately separated from electrical and fluid systems,

b. Are routed so as to minimise joints and sharp bends,

c. Are clear of moving controls and other mechanisms,

d. Are protected against grease or other lubricants, and are protected against the effects of vibration.

In addition, joints should where possible, be assembled dry, but where compounds are used for sealing they should be approved for that purpose.

6 Where the oxygen is supplied from chemical generators, the effects of heat emission, during both normal and inadvertent operation, on both the installation and other adjacent equipment, should be taken into account.

Details

Source-Title: AMC 25.869(c) Fire Protection for Oxygen Equipment

Erulesid: ERULES-1963177438-8616 Compare versions

Domain: Initial airworthiness

Amendedby: Initial issue

Applicabilitydate: 17 October, 2003

Entryintoforcedate: 17 October, 2003

Regulatorysource: ED Decision 2003/2/RM Navigate

Regulatorysubject: CS-25

Typeofcontent: AMC to CS (Acceptable means of compliance to certification specification)

Parentir: CS 25.869 Fire protection: systems

Origin: EASA

Category: EAR