The procedures did not require a pressure check or duplicate check.
Yes, this error was a mistake. At the time of the accident the procedure did not require a pressure check or duplicate check after the replacement of a windscreen. As the accident showed, this was a bad procedure. Procedures are made by the manufacturer’s engineers and by the operator’s engineers to guide maintenance personnel in their jobs. Procedures are made by maintenance engineers for maintenance engineers, and this procedure did not consider basic safety requirements. A mistake which makes the third element in the error chain.