Change 1 adds new safety requirements to DO-284. The bit error rate (BER) is now indicated in the integrity value and this update is included throughout the document. The number of operational hazards are increased in the Operational Hazard Assessment as outlined below: - Hazard Class 2 (must be extremely remote) 4 hazards - Hazard Class 3 (must be remote) 20 hazards - Hazard Class 4 (may be probable) 5 hazards Safety goal requirements now total 33. In Appendix B1@ Operational Safety Assessment@ several tables are updated with new information regarding loss of communication hazards related to interference caused by an analog transmission. Numerous other minor changes are also included