COMMUNICATIONS
Nav 1 Receiver
Just to the left of the autopilot is the Navigation receiver for Nav1. Input for frequency and
course for Nav1 is on this unit. The mouse click areas are left and right of each knob. When
inputting a Nav frequency it does not become active right away. It is activated by clicking the
center of the NAV frequency knob. This method allows an active frequency and to also select a
standby. To determine which frequency is active look at the EHSI display for the VOR/ILS
identification.
Clicking on the ID switch enables the "ident" feature which allows the pilot to listen to the morse
code identification of the selected frequency.
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Radios
There are four separate radios that are selected using the switches on the left side of the radio.
The COM, NAV and ADF radios have both "active" and "standby" frequency windows. The
active frequency is determined by clicking on the transfer switch (TFR). Standby and active
frequencies can be changed at anytime. The active frequency window will become highlighted.
Each knob has mouse click areas to the left and right of the knob for the changing of frequencies.
The ADF radio also has a click area in the center of the knobs.
AUTOPILOT FLIGHT DIRECTOR SYSTEM (AFDS)
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The AFDS has six basic functions. An autothrottle, altitude management, heading management,
navaid tracking, approach and autoland systems. A single Mode Control Panel (MCP) provides
control of the AFDS. The AFDS is turned on by clicking the F/D toggle switch to ON. The
MCP has mode selector switches that are operated by a click of the mouse. A light bar in the
lower half of a mode switch will light up to indicated that that particular mode has been
activated.
There are three autopilot systems designated as channels L, C and R. To engage the autopilot
select any 1 of the 3 autopilots by clicking the corresponding CMD button. To disengage the
autopilot just click the "DISENGAGE" bar one time and then a second time to cancel the
warning. Multiple autopilot operation is possible in APP mode only and provides an autoland
feature.
Autothrottle Modes
AUTOTHROTTLE ARM SWITCH
The autothrottle is engaged from the MCP using the switch labeled "A/T". The EADI will also
annunciate the engagement of the autothrottle with a green A/T. Once the autothrottle is
engaged the autopilot will control all power changes. It will adjust power to maintain the
selected airspeed in the following modes: SPD, FL CH and VNAV.
N1 SWITCH
This mode is used primarily for takeoff or climb and is not tied to the airspeed value. It will set
the power to the max available N1 setting. In this panel it is a pre-programmed value. The
airspeed in the IAS/MACH window will not be maintained by the autothrottle in this mode.
AUTOTHROTTLE DISCONNECT LIGHT
Illuminates when autothrottle becomes disconnected.
IAS/MACH DISPLAY
To adjust the airspeed value use the mouse clicks next to the knob. Power will be adjusted and
the airspeed will be maintained by the autothrottle in SPD, FL CH or VNAV modes.
IAS/MACH SWITCH
Selection of IAS or MACH is done by clicking the SEL button.
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SPD SWITCH
This mode is used by the V/S and ALT HOLD mode. SPD mode will cause the autothrottle to
maintain the proper power required to maintain the speed selected at the autopilot. Most of the
time this mode will automatically select with the selection of a vertical mode.
Altitude Management Modes
In addition to an altitude hold function there are three methods to change altitude with this
autopilot: VNAV, FL CH and VERT SPD. When a new altitude is selected the aircraft
"remembers" the last assigned altitude and will only start to climb/descend when a vertical
change mode is selected.
VNAV
The VNAV button will cause climbs and descents at a fixed rate while maintaining the selected
IAS/MACH. It will also maintain the selected altitude in the ALT window. If the VNAV is
maintaining a pre-selected altitude and a new altitude is set, the autopilot will not initiate a
climb/descent until the ALT button is pressed. VNAV overrides the ALT HLD mode when
VNAV is in use. When in VNAV mode and selecting a new altitude, the ALT select knob must
be clicked to initiate the vertical movement. Additionally when arriving at the selected altitude
the aircraft remains in VNAV mode instead of changing to ALT HLD. VNAV will override
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