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format is selected on the touchpad, the highlight does not remain on the new format.
Keypad options use a ``finger in'' mechanization. Only one option can be selected at a time. If two
or more selections are attempted at one time, none of them are considered valid.
Some formats initialize with data in the scratchpad, e.g. the COMM sublevel of the CNI format
initializes with the comm frequency in the scratchpad. When data entry is started, the digits in the
scratchpad are blanked, allowing data entry. If a comm frequency is being entered the decimal remains
displayed, allowing frequency entry in relation to the decimal point to be viewed.
The UFCD uses a double clear mechanism. The first selection of the ``CLR'' keypad option removes
the last digit that was entered in the scratchpad. The second selection of the ``CLR'' option removes
all the digits which have been entered in the scratchpad. If the scratchpad is flashing due to the 10
second timer (no entries in the previous 10 seconds), pressing CLR stops the flashing and performs the
previously described CLR function. If the scratchpad is flashing due to an error, pressing CLR stops
the flashing and removes all digits from the scratchpad.
2.18.5.1 UFCD CNI Function. The aircraft powers up with all CNI systems off and the top level CNI
format as the default UFCD display. See figure 2-47. This format is the central point for controlling all
CNI systems. For Communication-Identification Equipment, see Chapter 23. For Navigation Equipment,
see Chapter 24.
The following top level options are not related to CNI systems: DDI, EW, and FLR. The DDI option
provides the last selected DDI display on the UFCD. The EW and FLR options provide the specified
display format on the UFCD.
The top level CNI display does not use an ENT function, the MAN option is used to turn to a
previously entered manual radio frequency.
A1-F18EA-NFM-000
I-2-147 ORIGINAL
2.18.5.2 UFCD STANDBY Indication. A flashing STANDBY indication is provided just above the
center of the UFCD display surface when there is no valid mux communication between the MC and
MPCD. The STANDBY indication is superimposed over any display format. When the STANDBY
indication is displayed, power to the MPCD should be cycled to attempt a reset. If the STANDBY
condition clears before power can be recycled, the UFCD screen blanks and the previously displayed
format reappears.
2.18.5.3 RALT - Radar Altimeter Function. The RALT function indicates clearance over land or
water from 0 to 5,000 feet. Operation is based on precise measurement of time required for an
electromagnetic energy pulse to travel from the aircraft to the ground and return. A warning tone and
Figure 2-47. Up Front Control Display (UFCD)
A1-F18EA-NFM-000
I-2-148 ORIGINAL
visual warnings are activated when the aircraft is at or below a selectable primary or secondary low
altitude limit. The primary/secondary radar low altitude warnings are reset by setting the low altitude
index (primary), or UFCD selected altitude (secondary) to an altitude below the present altitude or by
climbing above the previously set limit. The warning tone can be disabled in either cockpit by pressing
the flashing RALT option on the UFCD Low Altitude Warnings format or UFCD DDI format, turning
off the radar altimeter, setting the warning value below current radar altitude, or by climbing above the
warning altitude. When disabled, the tone cannot be triggered until after being reset as described.
The radar altimeter consists of a receiver-transmitter and individual transmitting and receiving
antennas. The receiver-transmitter produces the energy pulses, transmits the energy to the ground,
receives the reflected signal, and processes the data for display as altitude by the head-up display unit
(HUD).
Indicators and controls used with the electronic altimeter set are the left or right DDI on the
instrument panel (for BIT checks), the ALT switch, UFCD (for secondary low altitude warning), and
the head-up display. Radar altimeter BIT is initiated from the BIT display.
Pressing the emission control (EMCON) switch on the UFCD inhibits operation of the radar
altimeter. EMCON is toggled on or off each time the EMCON switch is pressed. When EMCON is on
the letters E, M, C, O, N are displayed either in the left side option boxes (DDI display) or in the
scratchpad of the top level CNI display and on the HUD.
2.18.5.3.1 Low Altitude Warning Tone. When the aircraft descends below the primary low altitude
set in the UFCD, a ``Whoop, Whoop'' warning tone is heard in the aircrew's headset and the word
ALTITUDE is displayed on the HUD. The warning tone, when initiated by the primary radar low
altitude warning, is repeated at the lowest priority until reset or disabled.
　
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