Alternate IRS - Both

IRS (Inertial Reference System) Switch

NORMAL:

• Left IRS supplies:
  • Left & Centre EFIS SG
  • Captain's VSI
  • First Officer's RDMI
• Right IRS supplies:
  • Right & Centre EFIS SG
  • First Officer's VSI
  • Captain's RDMI
• Centre IRS is available as the alternate source

ALTN:

• Centre IRS provides Attitude, Heading and Track data for the appropriate system.

IRS FAULT

• Select ALTN on the appropriate system