Do Air France and other airlines have different visibility and wind limitations for ALL FOs, even if they are experienced people (who possibly have flown more legs/years in the A-340 than some Captains), or only for those in their first 100 hours or so on a given type?
Do the FOs fly an equal number of approaches/landings, or does a second Captain fly some of these landings?
Many 747-400 First Officers fly very few legs per month, and due to the fact that Captains "fly" most of the legs, the FOs must maintain currency each year in the simulator.
Although I know almost nothing about the accident at YYZ, a 747-400 almost crashed after takeoff at SFO years ago, which many Pprune members are aware of, with highly-experienced pilots in both seats. Engine vibrations made the EICAS and flight instruments difficult to read. Regulatory requirements for FOs, even for Captains (!) (six simulated approaches/landings each 6 months) do not necessarily equal hands-on proficiency.