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corner of the HSI. Waypoint/OAP data consists of bearing, range, and TTG (time-to-go) up to
8:59:59 based on distance and ground speed. When a waypoint/OAP or offset to the OAP is
designated (becomes a target), this data relates to the target. When a waypoint is a waypoint that
was transferred from the GPS, an ID code is displayed under the waypoint data.
2. TACAN data. TACAN data is displayed on the upper left corner of the HSI. TACAN data
consists of bearing, range (slant range), TTG (based on distance and present ground speed), and the
station identifier.
3. Waypoint/OAP symbology. Waypoint/OAP symbology consists of a waypoint/OAP symbol and a
bearing pointer and tail. The waypoint/OAP symbol indicates the position of the selected
waypoint/OAP relative to the aircraft symbol. The waypoint/OAP bearing pointer and tail are
displayed inside the compass rose and indicate bearing to the selected waypoint/OAP. Waypoint/
OAP symbology is displayed whether or not waypoint/OAP steering is selected. When the selected
waypoint/OAP is outside the HSI range scale, the waypoint/OAP symbol does not appear, but the
bearing pointer and tail appears. When a waypoint/OAP is designated, the waypoint/OAP symbol
and circle inside the pointer change to a diamond shape. The offset symbol appears when steering
is to an OAP. The offset symbol indicates the position of the offset relative to the OAP.
4. TACAN symbology. TACAN symbology consists of a TACAN symbol, and TACAN bearing
pointer and tail. The TACAN symbol indicates the position of the TACAN station relative to the
aircraft symbol. The TACAN bearing pointer and tail are located outside of the compass rose and
indicate bearing to the TACAN station. When the TACAN station is outside the HSI range scale, the
TACAN symbol does not appear but the bearing pointer and tail appear. When TACAN range
becomes invalid the TACAN symbol is not displayed.
5. Heading select/ground select marker and readout. The heading select/ground select marker is
maneuvered along the periphery of the compass rose using the HDG/TK switch. The digital readout
A1-F18EA-NFM-000
I-2-134 ORIGINAL
Figure 2-43. MPCD Controls and HSI Symbology
A1-F18EA-NFM-000
I-2-135 ORIGINAL
of the selected heading is located on the lower left corner of the HSI. The heading select/ground
select marker and digital readout are part of the heading select/ground track select mode of the
autopilot.
6. Course line arrow and readout. The course line arrow indicates the selected course to the
waypoint/OAP or TACAN station. The course is selected using the CRS switch. The digital readout
of the selected course is displayed on the lower right corner of the HSI. The course line arrow is not
displayed when TACAN range is invalid.
7. TDC assignment symbol. The TDC assignment diamond is displayed on the upper right corner
of the HSI. This symbol indicates that the TDC is assigned to the HSI. The TDC assignment
diamond indicates control is assigned to both cockpits. Other symbols indicate cockpit (d) or rear
cockpit (e) TDC control and SLEW control. SLEW is done by actuating the sensor control switch
AFT while in the NAV or A/G master mode. The word SLEW is displayed in the TDC assignment
diamond position when the SLEW option is active.
8. Coupled steering symbology. CPL and the source of the steering information is displayed on
either side of the aircraft symbol in the center of the HSI display whenever the flight control system
is coupled in azimuth to a steering source. Steering source can be WYPT, TCN, or SEQ#. The couple
cue flashes for 10 seconds and is removed if the steering signal is lost or becomes invalid.
9. Sequential steering lines. The sequential steering lines are displayed when a sequence is entered
and when one of the sequence options (SEQ1, SEQ2, or SEQ3) is boxed. The sequential steering lines
are available for display in all HSI modes and range scales. Sequential steering lines are not
displayed at power up with WonW and are removed when: magnetic heading is invalid, aircraft
position is invalid, or map slew is selected.
10. Time of day. Zulu time of day (ZTOD) or local time of day (LTOD) are displayed on the lower
left corner of the HSI. For aircraft that pass the FIRAMS real time clock power up BIT, ZTOD does
not need to be entered. For aircraft that do not pass the FIRAMS real time clock power up BIT,
ZTOD must be entered.
11. Groundspeed required. Groundspeed required appears below the current groundspeed readout.
Groundspeed required indicates the groundspeed required to a target based on entered ZTOD, time
on target (TOT), and the target.
12. Elapsed time (ET)/countdown (CD) time. ET and CD time are displayed on the lower right
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NATOPS Flight Manual 飞行手册 1(101)
