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Selecting the TCN option causes the MC to use position data from the selected TACAN station to
compute aircraft present position. The difference between the TACAN computed present position and
the on board determination of aircraft present position produces the position error readout in bearing
and range on the ACPT/REJ display. Selecting the ACPT option accepts the position update and
returns the MPCD top level display. Selecting the REJ option rejects the update and returns the
MPCD top level display.
24.4.5.1 TACAN Steering. Types of TACAN steering available for selection are direct great circle,
and course line steering. These TACAN steering options are mechanized identical to waypoint/OAP
direct great circle and course line steering, with steering being referenced to the TACAN. Selecting the
TCN option on the MPCD top level display provides TACAN direct great circle steering, see figure
24-18. Activating the CSEL switch with TACAN direct great circle steering selected provides TACAN
course line steering, see figure 24-19.
24.4.5.2 Coupled TACAN Steering. When TACAN steering is coupled, CPL TCN is displayed on the
HUD and HSI display and a CPLD advisory appears on the DDI. The aircraft steers to intercept the
desired course line, or flies to the TACAN station if no course line is selected. Bank angle is limited by
NAV or TAC mode as described in chapter 2. As the aircraft gets close to the desired course, the bank
angle is reduced to maintain the aircraft on the desired course. If a course line is selected, the aircraft
continues past the TACAN station on the outbound radial until the mode is decoupled. If no course
line is selected, TACAN steering uncouples when the aircraft reaches the TACAN station, reverting to
HDG hold. RALT or BALT, whichever is selected, remains engaged when the aircraft passes the
TACAN station. If TACAN steering does not engage or disengages without being commanded, an
AUTOPILOT caution is displayed on the DDI, and CPL TCN flashes for 10 seconds on the HUD and
HSI displays. The caution can be cleared with the paddle switch.
24.5 ICLS - INSTRUMENT CARRIER LANDING SYSTEM
The AN/ARA-63A ICLS is an all weather approach guidance system which operates with an aircraft
carrier installed transmitting set AN/SPN-41. The ICLS decodes transmitted azimuth and elevation
signals during an approach and provides steering information for display on the HUD, standby attitude
A1-F18EA-NFM-000
VII-24-48 ORIGINAL
Figure 24-17. TACAN Programming
A1-F18EA-NFM-000
VII-24-49 ORIGINAL
Figure 24-18. TACAN Direct Great Circle Steering
A1-F18EA-NFM-000
VII-24-50 ORIGINAL
Figure 24-19. TACAN Course Line Steering
A1-F18EA-NFM-000
VII-24-51 ORIGINAL
reference indicator, and EADI. The major components of the AN/ARA-63A system are a receiver and
a decoder.
24.5.1 ICLS Receiver. The ICLS receiver receives coded transmissions of azimuth and elevation
guidance data from surface transmitters. The receiver transforms these signals into coded pulses
suitable for processing in the decoder. A BIT module for system BIT check is contained within the
receiver.
24.5.2 ICLS Decoder. The ICLS decoder receives and decodes azimuth and elevation pulses from the
receiver and converts them to azimuth and elevation command signals for the HUD and standby
attitude reference indicator.
24.5.3 ICLS BIT. An ICLS BIT check is manually initiated by ensuring the ICLS is on and selecting
the ILS/AUG/BCN/D/L option on the BIT sublevel display. If any of the BIT monitored outputs fail,
a BIT status message of DEGD (degraded) appears on the BIT sublevel display. If the BIT checks are
good, a BIT status message of GO appears on the BIT sublevel display.
24.5.4 ICLS Initialization. The ICLS is enabled by placing the ILS UFC/MAN switch on the COMM
control panel to the UFC position, pressing the D/L BCN ILS option, and pressing the ILS option, on
the UFCD. This allows the ICLS channel number and ON/OFF status to be displayed on the UFCD
and CHNL # to appear on the CHNL option, see figure 24-20. Pressing the ON/OFF option turns the
ICLS on. The ICLS channel may be changed (1 to 20) using the UFCD keypad. The ICLS is
automatically selected when the ACL data link mode is selected.
Another method of enabling the ICLS is to place the ILS UFCD/MAN switch on the COMM control
panel to the MAN position. When this is done the ICLS is turned on and the ILS channel push buttons
on the COMM control panel are used for channel selection. The letters MAN appear on the scratchpad
and below the CHNL option.
24.5.5 ICLS Steering. When the ICLS is on and the ILS option on the MPCD top level display is
selected (boxed), ICLS steering is provided on the HUD, the standby attitude reference indicator, and
　
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