Display Selector
IRS Display Unit (ISDU)
Keyboard

Push –

Alpha keys:

  • Data displays are controlled by the keyboard when
    the N, S, E, W (latitude/longitude) or H (heading) keys
    are pushed.

  • Pushing an alpha key arms the keyboard for numeric
    entries.

Numeric keys:

  • Permit manual entry of present position when the
    ALIGN light is illuminated on the IRS Mode Selector.

  • Permit manual entry of magnetic heading when either
    mode selector is in ATT on the IRS Mode Selector.


                   
Tap ENT and CLR