The FAA do some very good free online books such as these engineering ones
https://www.faa.gov/regulations_poli...uals/aircraft/
for all things aircraft see
https://www.faa.gov/regulations_poli...uals/aviation/
RAF jet wise these are the manuals to look through... I can't help thinking some bits have been dumbed down over the years though.
I suggest book 1 although the full set is online.
AP3456 The Central Flying School (CFS) Manual of Flying
https://www.gov.uk/government/public...tent=immediate