AMS provides a navigational calculator to perform cal-culations based on the active .ight plan and current condi-tions of groundspeed, position and time. It displays esti-mated time of arrival, estimated time enroute, range and fuel calculations. The CDU accesses the active .ight plan for data used for the navigation calculator functions of es-timated time of arrival, required groundspeed, and esti-
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mated duration of .ight. This data may be manually over-written by the pilot, as desired. The navigation calculator screens are accessed through a main menu, accessed by the CLC .xed function key.
3.12.5.1 Calculator Menu Screen. The menu screen provides access to the display and data entry screens. It is accessed by CLC .xed function key. The displays and functions of active soft keys are as follows:
CONTROL/  FUNCTION 
INDICATOR 
sETA  Access  EST  TIME  OF 

ARRIVAL screen.

sREQ Access EST FUEL REQUIRED FUEL screen.
sREQ Access REQUIRED GS GROUNDSPEED screen.
sDURATION Access EST DURATION/ RANGE RANGE screen.
sRNG/BRG  Access RANGE AND BEARING screen.
3.12.5.2 Estimated Time of Arrival Screen. The CDU calculates and displays the ETA at any waypoint in the active .ight plan. ETA is only displayed when all edit-able .elds contain data, and either FPN or DIRECT soft key is pressed. The ETA calculations are preformed based on:
a.
Either current helicopter groundspeed, or a pilot en-tered groundspeed.

b.
Either present position and time, or a pilot entered start waypoint and expected start time.

c.
Either great circle route direct to destination, or along the active .ight plan.

d.
The displays and functions of active soft keys are as follows:

CONTROL/ FUNCTION INDICATOR
gFR WPT  Enter FROM waypoint number and name. When soft key is pressed, present position is displayed.
CONTROL/ INDICATOR  FUNCTION 
gTO WPT  Enter  TO  waypoint  number  or 
name. 
gSTART TIME  Displays system time. Press soft key to edit time to an expected start time. 
ETE  Displays estimated time enroute when all edit .elds contain data and FPN or DIRECT soft key is pressed. 
ETA  Displays estimated time of arrival when all edit .elds contain data and FPN or DIRECT soft key is pressed. 
GSs  Enter groundspeed. When soft key is pressed, current groundspeed is displayed. 
FPNs  Displays ETE and ETA based on .ying the active .ight plan. If either waypoint entered in FR WPT or TO WPT is not part of the .ight plan, annunciation of WPT NOT IN FPN is displayed in scratchpad, and there will be no display in ETE or ETA .elds. 
DIRECTs  Displays ETE and ETA as if .own as a direct to .ight plan. 
　
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