The specific objective of this Notice of Proposed Amendment (NPA) is to propose amendments to CS-25 following the selection of non-complex, non-controversial and mature subjects.
In particular, this NPA proposes amendments to the following items:
Item 1: full and unrestricted movement of cockpit controls. It is proposed to create a new AMC 25.777(c) to clarify the intent of CS 25.777(c).
Item 2: flap and slat interconnection. It is proposed to amend AMC 25.701(d) to correct the reference to FAA AC 25-14.
Item 3: ventilation. It is proposed to fully harmonise CS 25.831(a) with FAA FAR 25.831(a), and to amend AMC 25.831(a) to add acceptable means of compliance for operations without air conditioning.
Item 4: quantity of available oxygen. It is proposed to amend CS 25.1441(c) by introducing an exception applicable to oxygen chemical generators or small sealed, one-time use, gaseous oxygen bottles. A new AMC 25.1441(c) is also proposed regarding the design and maintenance of these sources of oxygen supply to ensure that oxygen is actually available.
Item 5: ashtrays in the lavatories. It is proposed to amend CS 25.853(g) and harmonise it with FAA FAR 25.853(g), i.e. by deleting the requirement to install ashtrays inside lavatories.
The proposed amendments are expected to contribute to updating CS-25 (Book 1 and Book 2) to reflect the state of the art of large aeroplane certification and improve the harmonisation of CS-25 with the Federal Aviation Administration (FAA) regulations. Overall, this would provide a moderate safety benefit, would have no social or environmental impacts, and would provide some economic benefits by streamlining the certification process.