OK, here is an excerpt from the CS 25
Other Sources of Procedures Information. The flight crew of large transport category aeroplanes typically use other sources of operating procedures information other than the AFM. Examples of other sources of operating procedures information include manufacturer- or operator- produced operating manuals, Quick Reference Handbooks (QRH), System Pilot’s Guides and Emergency or Abnormal Checklists. For these aeroplanes, items such as cockpit checklists, systems descriptions, and the associated normal procedures should not be presented in the AFM if they are provided in other documents acceptable to the Agency. Normal procedures that are necessary for safe operation should be presented in the AFM, but the remaining normal procedures should be placed in the manufacturer produced FCOM (or other acceptable sources of operating procedures information). The non-normal procedures section of the AFM for these types of aeroplanes should include, as a minimum, procedures dictated by the aeroplane’s system and failure modes, and may also include those emergency procedures listed in paragraph 6.c(5) of this AMC. Whenever procedures are provided in another source rather than the AFM, a statement should be placed in the appropriate procedures section of the AFM referencing where the detailed procedures information can be found.
Airbus clearly prescribes the priorities as ECAM, QRH and if time permits FCOM. Also bear in mind that OEBs when affected by ECAM refer to QRH and as airbus defines the roles to alter as PF/PNF each crew member must have a access to it instantly.
