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TST
STO
DME
MINIMUMS
RAD BARO IN Hpa
NAV SRC BARO SET
BRG V/L FMS BRG
HSI
Honeywell
PUSH STD
GX_16_001
FMS
PFD CONTROL PANEL
RMU
AUDIO CONTROL PANEL
MFD CONTROL PANEL
P I LOT T R A I N I N G GU I D E
NAVIGATION
16-2 For Training Purposes Only
Sept 04
DESCRIPTION
AUDIO CONTROL PANEL
The audio control panels, located on the pedestal, are used to transmit on various
radios as selected on the RMU and/or to receive NAV, ADF, DME and MKR
information, as selected on the RMU. For more information, see Chapter 5,
COMMUNICATIONS.
RADIO MANAGEMENT UNIT (RMU)
Each RMU contains the following functional modules:
• Integrated Navigation Unit
• VHF NAV Transceiver Module
• DME Transceiver Module
• ADF Receiver Module
• Integrated Communication Unit
• VHF COM Transceiver Module
• Mode S Transponder Module
• TCAS Interface Module
Any selectable parameter, such as VOR or ADF frequency, may be changed by
pressing the corresponding line key, then by rotating the tuning knobs to set a desired
value. For more information, see Chapter 5, COMMUNICATIONS.
GX_16_002
TRANSMIT EMER
VHF 1
NAV 1
SPEAKER HEADPHONE
NAV 2 ADF DME
ST MKR MUTE H'MIC
INT
VHF 2 HF 1 HF 2 PA
1 21 2
SPKR
ON
SPKR
OFF
MIC MASK
HI
SENS
LO
SENS
VHF 3
BOTH
I
D
V
O
I
C
E
For Training Purposes Only
Sept 04
16-3
P I LOT T R A I N I N G GU I D E
NAVIGATION
GLOBAL POSITIONING SYSTEM (GPS)
The GPS provides navigation data to FMS and EGPWS. The GPS calculates the:
• Latitude
• Longitude
• Altitude
• Accurate time
• North/South velocity
• East/West velocity
• Track angle
• Autonomous integrity limit
• Satellite position
• GNSSU status
The Global Navigation System Sensor Unit (GNSSU), is a GPS receiver that receives
satellite signals from the NAVSTAR GPS satellite constellation (21 operational
satellites and 3 active spares), and uses the satellite data to compute the airplane
position. GPS has an accuracy of 100 meters in 95% of the position fixes.
TUNE
COM1 NAV1
121.82 117.45
118.02 110.00
MEMORY-1
RANGE:
MEMORY-1
ATC/TCAS ADF1
1200
12
NORMAL
1799.5
15423
15600
1 ATC ALT ADF
LV
TCAS DSPY 1 HF1
SQ
ID
DIM
PGE
1/2
TST
STO
DME
GX_16_003
RMU 1 (PILOT’S)
Transfer
Key
Line
Select
Keys
Function
Keys
Main Tuning Page
Pilot’s Window
Copilot’s Window
– COM 1
NAV 1
ATC/TCAS
ADF 1
TCAS DSPY 1
HF 1
COM 2
NAV 2
ATC/TCAS
ADF 2
TCAS DSPY 2
HF 2
–
–
–
–
–
–
–
–
–
–
–
Tuning
Knobs
P I LOT T R A I N I N G GU I D E
NAVIGATION
16-4 For Training Purposes Only
Sept 04
The GNSSU has a Receiver Autonomous Integrity Monitor (RAIM) function. The
RAIM monitors the status of the satellites that are used for calculations. The output of
the RAIM function is an estimate of GPS position error. The RAIM value is sent to the
FMS and the FMS uses this data to determine if it can use the GPS for navigation.
GX_16_004
GPS 1
GPS 2
Prefered
(Option)
TO A/C
SYSTEMS
TO ANTENNA
GPS 2
Prefered
(Option)
GPS 1
For Training Purposes Only
Sept 04
16-5
P I LOT T R A I N I N G GU I D E
NAVIGATION
MODES OF OPERATION
The GNSSU has seven operational modes:
• Self-Test Mode – The GNSSU is in the self-test mode for approximately 5
seconds. When the self-test mode is complete, the GNSSU enters the initialization
mode
• Initialization Mode – The FMS provides the GNSSU with initial position. It is in
this mode for only a fraction of a second. When the hardware is initialized, the
GNSSU enters the acquisition mode
• Acquisition Mode – The GNSSU enters the acquisition mode to acquire satellites
(minimum 4), or from other modes (NAV or Aided), when it does not have
sufficient satellite and/or aiding data to remain in either the NAV mode or the
Aided mode. With initialization and almanac data available, the time to first fix
　
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