Terve!
http://www.seawings.co.uk/
has following downloadable manuals (pdf) in FLYING BOAT MANUALS GALLERY:
Consolidated Catalina Pilots Notes - Mks. I, Ia, II, IV, IVa, IVb,& V
Consolidated Catalina PBY-6A Pilots Handbook
Catalina PBY-5 and PBY-5A Handbook of Erection and Maintenance
Consolidated Catalina PBY 5 - PBY-5A - PBY-6A & OA-10 Handbook of Structural Repair
Cheers,
Kari