Display Selector
IRS Mode Selector Unit
Align Light

Illuminated –

  • Steady – the related IRS is operating in the ALIGN mode,
    the initial ATT mode, or the shutdown cycle.

  • Flashing – alignment cannot be completed due to IRS
    detection of:
  • Significant difference between previous and entered
    positions or an unreasonable present position entry.

  • No present position entry.
Extinguished –

  • IRS not in ALIGN mode

  • With mode selector in NAV, alignment is complete, and all
    IRS information is available.

  • With mode selector in ATT, attitude information is available.
    Heading information is available following entry of initial
    magnetic heading.