3.4 AVIONICS MANAGEMENT SYSTEM.
a. The avionics management system provides the pilot with a means of controlling the avionics communications and navigation systems, and displays information on the Multi Function Displays (MFD), the Horizontal Situation Indicators (HSI), and Night vision goggle heads up display (NVG HUD). The CDU is the primary controller for com-munication and navigation radios and sensors, and displays mission and system data as well as permitting operator entry and modi.cation of mission data. The CDU front panel provides a data display, a keyboard composed of al-phanumeric keys, two rocker keys, software-programmed keys (soft keys) whose functions depend on the adjacent display, and annunciators that indicate failures, status changes, or message alerts. The CDU keyboard is used to access top level menus or screens of the system functional areas and to enter or edit displayed data. Power for the AMS is provided from the dc essential bus, through circuit breakers marked CPLT CDU and PLT CDU, and from the battery utility bus through a circuit breaker marked CDU BKUP. The dc power from the battery utility bus acts only as a backup power source, maintaining power on AMS to for up to 10 seconds in the event of a dc essential bus power interruption.
3.4.1 CDU Controls and Functions. Controls for the AMS are on the front panel (Figure 3-2), and on the col-
lective stick (Figure 2-11). The function of each control is as follows:
CONTROL FUNCTION
Fixed Function
buttons:
CAU/ADV button Toggles between caution advisory and normal screen of CDU.
CLR Clears all data present in the scratch pad, and ends the edit.
COM Access main communication screen.
NAV Access main navigation screen, to select modes of navigation and tune radio navaids.
FPN Access .ight planning screen.
FIX Access screen to update position, and create waypoints.
VHF.FM NO. 1 / VHF.AM
RADAR WARNING ANTENNA
RADAR ALTIMETER ANTENNA
GLIDE SLOPE ANTENNA VOR / LOC ANTENNA (SAME BOTH SIDES)
VHF.FM NO. 2
ANTENNA
TRANSPONDER (IFF)
ANTENNA (TOP)
GPS ANTENNA
INFRARED
COUNTERMEASURE
TRANSMITTER
HF ANTENNA
VHF.FM HOMING ANTENNA (SAME BOTH SIDES)
UPPER TACAN ANTENNA
DOPPLER ANTENNA PLS ANTENNA VHF / AM.FM ANTENNA LD / ADF ANTENNA RADAR WARNING ANTENNA
TRANSPONDER (IFF)
ANTENNA (BOTTOM)
UHF
LOWER
COMM
TACAN
ANTENNA
MARKER ANTENNA
PLS RADAR STORMSCOPE
BEACON RADARANTENNA WARNING ANTENNAANTENNA WARNINGANTENNA
ANTENNA AB0333
SA
Figure 3-1. Antenna Arrangement
FIXED
FUNCTION
BUTTON
SOFT KEY
SOFT KEY
KEYBOARD ANNUNCIATOR
KEYBOARD ANNUNCIATOR
ROCKER KEY FIXED FUNCTION BUTTONS
AB0326
SA
Figure 3-2. AMS Control Display Unit
CONTROL DAT INI PPS
CLC
STS
SNS
IFF
TST
LTR
LNK
ZRO
ENT
Keyboard annunciators
ADV
STS
MSG
CDU
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