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longitude, altitude, carrier speed and heading,
directional gyro magnetic heading, aircraft true heading,
and surface waypoint range and bearing. The various
DEU formatsusedare shown in Figure 20-3. This Figure
shows the DEU MENU display and the five DEU formats
used for entry of initial data and navigation related
information. Use of these formats is discussed in paragraph
20.3, Navigation System Operation. Refer to
Chapter 2 for detailed information on the DEU.
20.1.4.2 Digital Display. The APG-71 DD provides
the RIO with an alternate means of entering most
initial navigation data into the system except for SAHRS
DG heading and barometric altimeter setting and control
of JTIDS navigation functions. Use of the DD for entry
of navigation is provided in paragraph2 0.3, Navigation
System Operation.
20.1.5 Displays Subsystem. Navigation information
is provided to the pilot and RIO in both graphic
and alphanumeric formats via HUD for the pilot and the
three MFDs for both crewmembers. In addition, certain
MFD formats provide pushbutton legends that permit
submode selection and selection of other related display
formats. These include HUD, VDI, HSD, OWN A/C,
NAV AID, SURFACEWPT, INS UPDATE, and several
alignment formats. A description of the outputs available
and the use of these outputs can be found in paragraph
20.2, Navigation System Data Distribution, and
NAVAIR Ol-F14AAD-1
paragraph2 0.3, Navigation System Operation.T he displays
are discussed in detail in Chapter 2.
20.1.6 Tactical Information Display. The TID
provides the RIO an alternate means of display for many
of the alphanumeric and graphic outputs of the navigation
system. Information is transmitted from the MCS
to the APG-7 1 and then to the TID. Selection of display
data is made via the DD.
20.1.7 Converter Interface Unit. The CIU accepts
all nondata, bus-compatible navigation aid inputs
and converts them to the proper format. The CIU also
convertst he steering error commands generatedb y the
MCS into the required analog signals for the AFCS.
These navigation aids, as they pertain to the navigation
system, are described in the following paragraphs.
20.1.8 Central Air Data Computer. The CADC
is a single processor digital computer that gathers,
stores,a nd processesp itot pressure,s tatic pressure,t otal
airstream temperature, and angle-of-attack data from
aircraft airstream sensors. In addition to performing
wing sweep, flap and slat schedule computations, and
limit controls for the flight control systems, the CADC
provides air data related parameters to the MCS via the
CIU. This information includes pressure altitude, pressurea
ltituder ateo f change,t rue and calibrateda irspeed,
angle of attack, and Mach number. True and calibrated
airspeed, angle of attack, and Mach number are displayed
directly to the crew on the HUD and VDI format
of the MFDs. Pressure altitude is corrected for nonstandard
day conditions and then displayed as system altitude.
True airspeedm ay also beu sed in the computation
of wind. Wind provides a reference velocity source for
the INS or SAHRS for in-flight alignment and is a component
of system velocity during backup navigation
modes. A description of the pitot-static system and the
CADC is provided in Chapter 2.
20.1.9 ANIARN-118 Tactical Air Navigation
System or ANIURC-107 Joint Tactical Information
Distribtuion System. The tacan system is a
UHF navigationr eceiver-transmittert hat is usedt o provide
navigation information by determining slant range
and bearing to a selected tacan station. Operating range
is line of sight to approximately 300 nm. Accuracies are
0.1 nm in range and 0.5’ in bearing. The tacan station
can be surface (land based or shipbome) or airborne.
I
Surface stations can be either tacan or vortac. When
operating in the REC or T/R modes, the system is capable
of receiving signals from a ground station simultaneously
with 99 other aircraft. When in the A/A mode,
the system is capable of transponding with each of five
cooperating aircraft, providing slant range information
to each; however, the system will interrogate and lock
20-5 ORIGINAL
NAVAIR Ol-F14AAD-1
Figure 20-3. DEU Navigation Formats
ORIGINAL 20-6
I on to only one. In A/A mode, the second aircratI must
be 63 channels apart. An airborne station provides only
slant range distance unless the aircraft is equipped with
a bearing transmitter and a rotating antenna. The
ANIARN-llSorANiURC-107arenotabletotransmit
bearing information but can receive it from a specially
　
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