1- PNF while PF does walkaround
2- Expected SID is usually indicated on flight plan to be loaded. By listening to ATIS for runway in use, a guess at the SID to be used will be possible knowing direction flight takes. ATC clearance not normally obtained until 15 minutes to pushback. The route itself will be on the ATC flight plan on the PLOG
3- When A/P engaged, PF handles and executes route details, or requests PNF to do so. When handling, PF should not touch the FMS but request other pilot to do so