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1. Access the TACAN Status page by pressing the DATA function
key to access DATA page 2 and then selecting the [TACAN]
option.
2. Press the CANCEL MANUAL line select key [2R].
3. TACAN automatically reverts to nearest TACAN station and
indicates STATUS NORMAL.
Section VII
Sensors & Interfaces
7-10 2423sv602
Change 1
Radio Reference Sensor (RRS)
During system initialization and ground operations, the VOR, DME,
and TACAN will be deselected. Upon takeoff, all three will
automatically be selected. In the event of an aircraft weight-on-gear
failure, they will automatically be selected when the TAS reaches
150 kts.
RRS Deselect
1. Access the VOR, DME or TACAN Status page by pressing the
DATA function key to access DATA page 2 and then selecting
the [VOR, DME or TAC] option.
2. Press the [DESEL DME/VOR] line select key to deselect the
VOR or DME portion of the RRS/TAC.
RRS Reselect
1. Access the VOR or DME or TACAN Status page by pressing the
DATA function key to access DATA page 2 and then selecting
the [VOR, DME or TAC] option.
2. Press the [SELECT DME/VOR] line select key to reselect the
VOR or DME portion of the RRS/TAC.
Doppler
The FMS supports three types of Doppler sensors; the RACAL 91,
the CMC 2012 and the ASN-137. The Doppler sensor is
automatically selected at takeoff and is deselected at landing.
Doppler is also deselected at power up and approach arm.
Doppler Sensor Deselect
1. Access Doppler Status page from DATA page 2.
2. Press the DESEL DOPLR line select key. The Doppler status
field will show a (D) when the Doppler is selected.
Section VII
Sensors & Interfaces
2423sv602 7-11
Change 1
Doppler Sensor Reselect
1. Access Doppler Status page from DATA page 2.
2. Press the SELECT DOPLR line select key. When the Doppler is
selected, the (D) in the status field will no longer be displayed.
Doppler Status
Racal 91 Doppler Status
The Doppler Status page is accessed from DATA page 2 by
pressing the DOP line select key.
DOPPLER 1/2 page displays the operational status of the Doppler
91. DOPPLER 2/2 page displays diagnostic information for use by
maintenance personnel. The DOPPLER 1/2 page is explained
below:
STATUS - The status displayed will be displayed as either
NORMAL, TEST, UNLOCK or FAIL.
XMIT - Transmit status displayed as either ON or OFF.
POWER - The power level will be displayed as either HI POWER or
LO POWER.
SELF TEST - This line select key is used to start or cancel Doppler
self test. Pressing this line select key initiates self test indicated by
START in the status field. Pressing the line select key during self
test will cancel self test indicated by OFF in the status field.
SEA STATE - Pressing this line select key will toggle Sea State
between LO and HI.
MODE - Pressing this line select key toggles the mode between CW
(Continuous Wave) and ICW (Intermittent Continuous Wave).
Section VII
Sensors & Interfaces
7-12 2423sv602
Change 1
FMS1 - FMS velocity.
DVS1 - Doppler velocity.
DESEL DOPLR - This line select key is used to deselect and
reselect the Doppler. When Doppler is deselected, a (D) will appear
after the STATUS description.
ASN-137 Doppler Status
The ASN-137 Doppler status page is accessed from DATA page 2
by pressing the DOP line select key.
The DOPPLER 1/1 page displays the operational status of the ASN-
137 Doppler. The DOPPLER 1/1 page is explained below.
STATUS - The status displayed will be either NORMAL, MEMORY
or FAIL.
DVS VEL - Doppler velocities for the x, y and z components. If any
velocity is not received for 1/2 second, the field will be dashed and
the information will not be used for navigation solution.
FMS1 - FMS velocity.
DVS1 - Doppler velocity.
SELECT DOPLR - This line select key is used to deselect and
reselect the Doppler. When Doppler is deselected, a (D) will appear
after the STATUS description.
Section VII
Sensors & Interfaces
2423sv602 7-13
Change 1
CMC 2012 Doppler Status
The 2012 Doppler Status page is accessed from DATA page 2 by
pressing DOP line select key.
DOPPLER 1/2 page displays the operational status of the 2012
Doppler. The DOPPLER 2/2 page displays diagnostic information
for use by maintenance personnel. The DOPPLER 1/2 page is
explained below.
STATUS - The status displayed will be NORMAL, TEST or FAIL.
TRACK MODE - Displayed as either CRUISE or HOVER.
SELF TEST - This line select key is used to start Doppler self test.
Pressing the key once will bring the cursor over the START prompt.
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