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numerals are updated at the rate of 1Hz regardless of
aircraft speed. The right-hand character field displays
the legend TTG X:XX to the FLY-TO destination in
Hours and Minutes (H:MM). When less than five (5)
minutes from destination, these units change to Minutes
and Seconds (M:SS). If TTG to the FLY TO exceeds
9 hours and 59 minutes, or the aircraft
groundspeed is less than 10 knots, the display is
dashed. Both of the character fields are read-only and
cannot be edited.
Line 5. - Displays the legend TKA XXXDEG and GS
XXXKPH. TKA denotes the computed Track Angle, in
Degrees (DEG), while GS reflects Ground Speed. GS is
presented in Kilometers Per Hour (KPH) or Knots
(KTS) dependent on display selected. The units for
both DIST and GS are the same for a given selection:
KM and KPH, or NM and KTS.
Line 6. - Displays the System Annunciator Data which
consists of three elements: A DNS Memory (MEM) element;
a Navigation Status (NAV STAT 1-3) element;
and a Check FDLS (ü FDLS) element. These status
messages may appear at any time on this line. A display
on this line indicates that the DNS has either lost
radar lock (MEM); the navigation error exceeds certain
parameters (NAV STAT 1-3); or, the Continuous FDLS
test has detected a fault in the system ( ü FDLS). Navigation
Status categories are as follows:
Table 3-22.1. NAV TOP LEVEL PAGE VARIABLE ACTION BUTTONS
Control/Display Function
VAB 1
VAB 2
VAB 3
NAV STAT 1: Estimate of position error calculation is
less than 50 meters. Actual position error may be substantially
less. PPOS updates are disabled.
NAV STAT 2: Estimate of position error calculation at
least 50 meters but less than 201 meters. Actual position
error may be substantially less. All PPOS update
operations are enabled.
NAV STAT 3: Estimate of position error calculation is
greater than 200 meters. Actual position error may be
substantially less. All PPOS update operations are enabled.
Line 7. - The left-hand character field displays the legend
FLY TO TXX or FLY TO WXX, depending upon
the selected destination to which the system is navigating.
The displayed value can be any of the 40 waypoint
locations in the FPLN List; or any of the 40 target locations.
UPD TO WXX displayed indicates the destination
to which the system is being updated. The righthand
character field displays the legend STR WXX
representing the waypoint number (from 31-40) to be
used by the system for the next PPOS store.
Line 8. - This is the scratchpad line for manual data
entry.
Access to NAV system pages is accomplished using
Variable Action Buttons (VABs) located on either side of
the CDU display screen. Refer to table 3-22.1 for their
respective function. There are three (3) NAV system
pages: ADMIN, Hover Bias Calibration Mode
(HBCM), and Offset Update (OFS UPDT).
If NAVSTAT 1 is displayed on line 6 of the NAV page, VAB 1 is disabled.
Depressing the VAB 1 button with no data present in the scratchpad freezes the current
displayed PPOS data and changes the PPOS legend to ð UPD indicating the system is
ready for a manual PPOS update. A second depression of VAB 1 with no scratchpad data
present aborts the manual update.
Depressing the VAB 1 button with data present in the scratchpad that satisfies the
PPOS, Datum, or MAGVAR data entry rules will cause the intended system parameter
to be updated.
Used for manually entering PPOS and Datum updates. Allows manual MAGVAR
updates when the outlined arrow ð is displayed in character position 1 on line 2.
Not Active.
Not Active.
Change 4 3-64.5
TM 1-1520-238-10
Table 3-22.1. NAV TOP LEVEL PAGE VARIABLE ACTION BUTTONS - continued
Control/Display
VAB 4
Function
When depressed, if the left-hand character field in line 7 displays the legend UPD TO,
will complete a flyover type PPOS update; and display updated PPOS on line 1. When
updated data is accepted or aborted, line 7 will return to its’ previous legend of ð FLY
To.
With valid FLY TO data symbol (WXX or TXX with valid previously entered
coordinates) entered on the scratchpad, will change the active FLY TO to location
entered in scratchpad. Invalid scratchpad coordinate data will result in “ERROR”
message on scratchpad.
Without data in scratchpad; will display active FLY TO coordinates in scratchpad with
initial depression. Second depression will display the Associated data line (ID, Altitude
and Datum) for the active FLY To coordinates. Subsequent depressions will toggle
between the FLY TO coordinates and the Associated Data. FLY TO coordinates and
　
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