In Avionics, Safety and reliability are paramount in mission-critical systems. The Design Assurance Level (DAL) classification, as defined by standards like DO-178C and DO-254, ensures that software and hardware components meet rigorous Safety requirements based on their impact on overall aircraft operation.

DAL A

Catastrophic Failure Conditions

  • Flight Control Computers (e.g., Fly-By-Wire Systems)
  • Full Authority Digital Engine Control (FADEC)
  • Primary Avionics Processing Systems (e.g., Flight Management System, FMS)
  • Autopilot Systems

DAL B

Hazardous/Severe-Major Failure Conditions

  • Secondary Flight Controls (e.g., Flaps / Slats Control)
  • Engine Indication and Crew Alerting System (EICAS) / Electronic Centralized Aircraft Monitoring (ECAM)
  • Traffic Collision Avoidance System (TCAS)
  • Ground Proximity Warning System (GPWS/TAWS)

DAL C

Major Failure Conditions

  • Weather Radar System
  • Terrain Awareness and Warning System (TAWS)
  • Flight Data Recorder (FDR) and Cockpit Voice Recorder (CVR)
  • Secondary Navigation Systems (e.g., VOR, DME, ADF)

DAL D

Minor Failure Conditions

  • Cabin Pressure Monitoring System
  • Non-Critical Crew Displays (e.g., In-Flight Entertainment Systems, Passenger Announcement System)
  • Some Maintenance and Diagnostic Software

DAL E

No Safety Effect

  • Cabin Entertainment Systems
  • Passenger Wi-Fi and Internet Connectivity
  • Electronic Flight Bags (EFBs)
Information

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DO-178C up to DAL A


Avionics Safety Certification

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