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3.4.2.5 Alphanumeric Keys. The numeric key are available in lower case which is default mode. The system will automatically shift to alpha keys (indicated by a boxed L on the scratch pad line) when it expects a letter entry. If the system cannot determine what is expected (i.e. call signs) the operator may use the LTR key to shift cases.
3.4.2.6 Editing. A box drawn around a parameter indi-cates that it is selected for editing. While on a screen the operator can step through the editable .elds by pressing the ENT key if there is nothing in the scratchpad, or by press-ing the soft key adjacent to the parameter. When the box is around the .eld to be edited, enter the new values in the scratchpad, and press ENT to change the .eld.
3.4.2.6.1 Error Messages. During edit, the expected format of the entry is shown on the scratch pad. If an error in entry is detected, ERROR will be displayed in inverse video in the scratch pad line for two seconds followed by a description of the expected entry.
SYSTEM SELECTED
TIME
RADIO NAV
PRESET ID MODE

FREQUENCY PRESET NAME
AB0327
SA
Figure 3-3. COM Header
3.4.2.6.2 Editing Using Fixed Function Keys. Dur-ing entries CLR clears the scratch pad and terminates the edit. ENT accepts the entry. PRV deletes the last key stroke and NXT pulls characters down from the current parameter value. For special format entries (i.e. lat/long, zone/coord, date/time) the editor will .ll unentered positions with blanks or zeros as appropriate. Entries are alined based on their decimal point position. If no decimal has been en-tered, one is assumed after the last character keyed.
3.4.2.7 Fixed Header. The .xed header functions inde-pendently from the rest of the screen. Its purpose is to provide continuous display of essential navigation and communication information. Direct entry into the header is not permitted. Headers are either in COM or NAV format.
3.4.2.7.1 COM Header. Display communication radio status for copilot and pilot radios as selected on the ICS control panel. The Com header is divided into two halves, showing communication radio selections for the pilot (PLT) and copilot (CPT) (Figure 3-3).
INDICATION FUNCTION
System Time Indicates system time.

INDICATION FUNCTION PLT Indicates pilot’s side of display. In
inverse video when selected radio is keyed.  the  ICS 
Preset ID  Shows selected preset. Blank if manual tune, or ICS mode, *EMERG* when emergency selected. 
Selected Radio  Type of radio selected with ICS mode selector switch. 
Frequency  Frequency or channel display. Area displays SCAN when in scan mode and is blank when in ICS selection mode. 
Preset Name  Name of preset chosen. 
Nav Mode  Indicates navigation mode of the AMS. 
SEC  Appears in inverse video when the selected radio is in CIPHER mode. When operating in PLAIN mode, the display is MHZ or blank. 
CPT  Indicates copilot’s side of display. In inverse video when the ICS 

selected radio is keyed.

3.4.2.7.2 NAV Header. Displays navigation status of AMS, giving summary of position of TO waypoint (Figure 3-4).
INDICATION FUNCTION
RNG  Distance in nautical miles to the parent waypoint. Displays are 0 to 9999.9 or ****.* if beyond range.
0.0 is displayed when there is no active steering.

BRG  The magnetic bearing to the parent waypoint.
NXT  The initial desired magnetic course of the next leg of the .ight plan with the parent waypoint as the FROM point. Blank when there is no next leg.
NAV MODE SYSTEM TIME

ALTITUDE
AB0328
SA
Figure 3-4. NAV Header

INDICATION  FUNCTION 
WND  Computed  wind  direction  and 
velocity in knots 
Time  System time. 

TTG  Time to go to the parent waypoint at current ground speed.
　
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