CS 25.1447 Equipment standards for oxygen dispensing units

Where Operational Regulations do not require all passengers to be provided with oxygen, (c)(3) and (c)(4) may not apply.

1 When oxygen masks are presented, oxygen should be supplied to the mask but without flow. 2 Oxygen flow from the mask should be initiated automatically on pulling the mask to the face. 3 Facilities for manual presentation by a crewmember should be provided on each dispensing unit. 4 Indication of the operation of the automatic presentation system should be provided at the appropriate flight-crew station. 5 The design of the automatic presentation system should take into account that when the landing field altitude is less than 610 m (2000 feet) below the normal preset automatic presentation altitude, the automatic presentation altitude may be reset to landing field altitude plus 610 m (2000 feet). 6 A supplemental oxygen supply should be provided for each passenger lying on a bed or a seat that can be converted into a bed. Except for cases where the occupant’s head location during sleeping is obvious, a placard indicating the correct sleeping position should be installed, unless the passenger oxygen system is designed to account for any sleeping position. 7 Sufficient illumination should be provided at all times or automatically when necessary (i.e. without the need of a crew action and without delay) at each location where supplemental oxygen is provided so that in the event of oxygen mask presentation, the user has sufficient visibility to enable quick donning.

[Amdt 25/19]

Unless it is required that the pilot at the control is wearing his mask and breathing oxygen while the altitude exceeds 7620 m (25 000 feet), the design of the flight-crew masks and their stowages should be such that each mask can be placed in position and put into operation in not more than five seconds, one hand only being used, and will thereafter remain in position, both hands being free.

It is acceptable that oxygen outlets/units of dispensing equipment are not provided within an area where people are likely to congregate (for instance a waiting area for lavatory facilities, a bar/lounge area etc.), provided the applicant demonstrates that sufficient oxygen-dispensing outlets are within five feet or five seconds reach of the area and that no visual obstruction exists between the potential oxygen users and the outlets, such as curtains or partitions, unless another method of indication (e.g. an ‘oxygen in use’ light) is provided in the area. There should be at least two outlets and units of dispensing equipment in toilets, washrooms, galley work areas etc. In such areas where occupancy of more than two persons can be expected, the number of outlets (within the area or within five feet or five seconds reach) should be consistent with the expected maximum occupancy. In the case of a shower, there should be an oxygen outlet and unit of dispensing equipment immediately available to each shower occupant without stepping outside the shower. Reaching through an opened shower cubicle door is acceptable, in which case the door should be sufficiently transparent so that the location of the mask and the required actions to access it are immediately obvious.

[Amdt 25/13]

[Amdt 25/15]

[Amdt 25/19]

1 The equipment should be so located as to be within reach of the cabin crewmembers while seated and restrained at their seat stations. 2 The mask/hose assembly should be already connected to the supply source, and oxygen should be delivered with no action being required except turning it on and donning the mask. 3 Where a cabin crewmember’s work area is not within easy reach of the equipment provided at his seat station, an additional unit should be provided at the work area.