3.16.2.2 Radio Nav Screen. Use Radio Nav screen to change modes of operation. This screen is accessed by
TM 1-1520-253-10
SA
pressing SETTINGS soft key on NAV SELECT screen. 3.16.3 Operation. The function of each control is as follows:
CONTROL/ INDICATOR FUNCTION
RADIO-NAV Title of screen.
BRG: Displays TACAN selected station. bearing to the
RNG: Displays TACAN slant range to the selected station.
GS: Displays TACAN computed groundspeed to the selected station.
TTG: Displays TACAN computed time to the selected station at the calculated groundspeed.
AA/AGs Toggles between air-to-air and air-to-ground mode. Selected mode is displayed in inverse video.
TR/RCVs Toggles between transmit/receive and receive only mode. Selected mode is displayed in inverse video.
RTNg Returns screen. to previously selected
3.16.2.3 TACAN Preset Screen. Use TACAN preset screen to change channel and mode settings of a preset. See Figure 3-25 for ways to access this screen. Displays on the screen and active soft keys are as follows:
CONTROL/ FUNCTION INDICATOR
TACAN PRESET Title of screen.
gPRESET Change preset number.
gNAME Change name of preset.
gCHANNEL Change channel number.
A/A -A/Gs Toggles between air to air and air to ground mode of operation.
TR/RCVs Toggles between transmit/receive and receive only or receive only mode.
3.16.3.1 Test Procedure.
1.
VTAC switch on instrument panel -TACAN.
2.
HSI CRS control (pilot and copilot) -Set 180° in course display.
3.
Access NAV TESTS page by pressingTST .xed function key, then NAV soft key. To start test, TACAN soft key -Press, until TACAN is displayed in inverse video.
4.
All indications below TACAN should read P.
5.
Indications on the HSI shall be as follows:
a. Distance indicator shall read between
399.5 and 000.5 nmi.
b.
No. 2 bearing pointer shall read between 177° and 183°.
c.
Course deviation bar shall be centered within 1/2 dot, and To/From indicator shall indicate TO.
d.
TACAN indications on the HSI will be re-moved unless there is a station that the set is tuned to nearby.
3.16.3.2 Normal Operation Receive Mode.
1.
Choose channel, or preset on NAV SELECT screen.
2.
On RADIO-NAV screen, AA/AG and TR/RCV soft keys -Press, until AG and RCV is in inverse video.
3.
Wait .ve seconds for signal acquisition and lock on.
4.
On CSC panel, NAV B monitor control -Press.
5.
Check for correct station identi.er in ear-phones.
6.
Navigation information will consist of bearing information only displayed on the HSI.
3.16.3.3 Normal Operation Transmit/Receive Mode.
1. Choose channel, or preset on NAV SELECT screen.
TACAN is a transponder that emits ra-diation. Make sure no personnel are within 3 feet of either TACAN antenna when TACAN is used in Transmit/Receive mode.
2.
On RADIO-NAV screen, AA/AG and TR/RCV soft keys -Press, until AG and TR is in inverse video.
3.
Wait .ve seconds for signal acquisition and lock on.
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