Change 1 to ED-256 contains changes to requirements and tests that were are required to correct issues found during first implementations. During the first Open Consultation additional comments were raised against ED-256. These comments led to additional change proposals which on request of EASA and FAA shall be included in Change 1. The respective information was added to the Change 1 document in chapters 1.16 to 1.20. These chapters are the main focus of the second Open Consultation.