- operating as Pilot Flying in Low Vis conditions (take-off/approach/landing)?
CPT for landing, take off down to 400m RVR permissible for both, below that CPT only.
- calling for and executing a Rejected Take-off?
CPT, FO calls conditions
- landing/take-off in adverse weather conditions, eg. x-wind/contaminated
runways/wind shear/etc?
No limits, however the PIC allway can decide to take it for himself.
- challenging/demanding approaches like circling approaches/Cat C airfields?
Depends, quite a lot more airfields are CPT only than in my previous airline (which was a subsidiary but had more experienced FOs). However no global ban on Cat C airfields, circlings are normal procedure and both can do it.
- taxiing the aircraft?
CPT, no tiller on the right side.
- signing the Tech log?
CPT only.