Air Data

The air data inertial reference units (ADIRU) send air data to the ATC transponders.

ATC transponder 1 gets air data at AD input 1 from the left ADIRU air data reference (ADR) bus 4. The left ADIRU also supplies air data to the ATC 2 transponder from ADR bus 4. ATC transponder 2 gets air data at AD input 1 from the right ADIRU air data reference (ADR) bus 4. The right ADIRU also supplies air data to the ATC 1 transponder from ADR bus 4.