a. The expected top-of-climb outside air temperature (OAT) was entered into the OAT field on the n1 limit page instead of the OAT at the airport (a figure of - 52°C as opposed to +16°C); and
b. The correct assumed temperature of 48°C was entered into the FMC."
There also seems to be a lack of X-checking by both plots of data entered into their electronic toys. How does it work in most airlines? Do both pilots make takeoff performance calculations independently on their own i-pads as a X-check, or is it just one who does it? And even then, is the data entered read out by the other or is it just a one man band calculation? If the latter then there really is a chance of an unmonitored screw up.