hugh fd
Aircraft logs are maintenance records that MUST be kept - see Annex 6 Part I subsection 8.4. See also ICAO Doc 9760 AN/967 Airworthiness Manual Volume I regarding record-keeping (which includes maintenance records referred to in Annex 6).
6.8.4 Record-keeping
6.8.4.5 Maintenance records should be kept in such a way that they are protected from hazards such as fire, flood, theft or alteration.
I'm not an engineer, but I'd think that carrying the maintenance records onboard the aircraft to which they belong is (probably) going to expose them to hazards.
Any other 'takes' on hugh's problem?