Aft Overhead Panel  700/800/900
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.

  • Permit manual entry of magnetic heading when either mode
    selector is in ATT.