In the olde days Airlines had days of ground school lectures ETC to 'know' the aircraft...About 1970's Boeing came through with 'need to know'Chapter 3 of the AFM(how to)fly the aircraft..
Generally the SOP's,as the manufacturer saw it were quite Basic.
Airline 'culture'added certain info as 'nice to do',as seen by the
Flight standards dept.(constant change) covering percieved weaknesses in the day to day operations.This policy applied to the QRH,and this too became a 'bible' of information-transposed from the AFM(bulky?)...
Boeing's 'need to know' dropped certain 'good'advisory information(like landing on contaminated runways)from the 'supplemental'chapters,which had to be published elsewhere.
At the moment the most 'basic' SOP's and 'Standard' calls are in the Airbus Fcom's/AFM's(320)
