DOC AIRBUS | AMM A320FON BOARD AIRPORT NAVIGATION SYSTEM (OANS) - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
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1. General
The OANS is a crew function which:
** ON A/C NOT FOR ALL The OANS is a crew function which:
OANS - General- Gives the display of an airport moving map
- Prevents runway incursions and navigation errors and decreases taxiing time.
2. Component Location
The Onboard Airport Navigation Computer (OANC) is located in the main avionics compartment, on panel 91VU (lower part of panel 90VU).
A dedicated Onboard Airport Navigation System (OANS) data loading connector (2148VC) is located in the cockpit, on panel 117VU.
** ON A/C NOT FOR ALL The Onboard Airport Navigation Computer (OANC) is located in the main avionics compartment, on panel 91VU (lower part of panel 90VU).
A dedicated Onboard Airport Navigation System (OANS) data loading connector (2148VC) is located in the cockpit, on panel 117VU.
| FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE | ACCESS DOOR | ATA REF |
|---|---|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||||
| 1FX | OANC | 91 VU | 121 | 34-38-00 | |
| 35WT | CCD CAPTAIN | 211 | 31-61-14 | ||
| 36WT | CCD FIRST OFFICER | 212 | 31-61-14 | ||
3. System Description
The OANS includes:
When the OANS function is activated (with the scale selector switch in the ZOOM position on the Electronic Flight Instrument System (EFIS) control panel), the OANC generates two independent video displays, one for each Navigation Display (ND). Each ND shows an aircraft moving map and an OANS setting display-window controlled by the OANC. An aircraft symbol shows the aircraft location and heading on the airport moving map. The OANS display is controlled (on the CAPT and F/O sides) with the Cursor Control Device (CCD) and the EFIS control panels.
The selection of the airport moving map can be done manually by the crew or automatically through the Flight Management System (FMS) flight plan (the flight plan gives the departure, alternate and destination airports).
** ON A/C NOT FOR ALL The OANS includes:
- An OANC
- An OANC mass memory card
- An OANC software
- An OANC database software, which is the Airport DataBase (ADB).
- Airport moving map display (moving map of the airport surface)
- Aircraft position overlay (display of the aircraft symbol on the airport map)
- Map annotation
- Advisory (optional runway approach phase)
- Airport selection.
When the OANS function is activated (with the scale selector switch in the ZOOM position on the Electronic Flight Instrument System (EFIS) control panel), the OANC generates two independent video displays, one for each Navigation Display (ND). Each ND shows an aircraft moving map and an OANS setting display-window controlled by the OANC. An aircraft symbol shows the aircraft location and heading on the airport moving map. The OANS display is controlled (on the CAPT and F/O sides) with the Cursor Control Device (CCD) and the EFIS control panels.
The selection of the airport moving map can be done manually by the crew or automatically through the Flight Management System (FMS) flight plan (the flight plan gives the departure, alternate and destination airports).
4. Power Supply
The OANC is supplied with 115VAC.
For the list of circuit breakers, refer to the paragraph "Interface".
** ON A/C NOT FOR ALL The OANC is supplied with 115VAC.
For the list of circuit breakers, refer to the paragraph "Interface".
5. Interface
A. With Control Means:
- EFIS control panel
- NORTH REF switch
- CCD.
(1) The EFIS control panel
The OANS is interfaced with the EFIS control panel via the ARINC 429 bus to control the display and the range of the airport moving map transmitted by the OANS:
The OANS is interfaced with the EFIS control panel via the ARINC 429 bus to control the display and the range of the airport moving map transmitted by the OANS:
- 0.2NM, 0.5NM, 1NM, 2NM and 5NM.
(2) The NORTH REF switch
- The OANS is interfaced with the "NORTH REF" switch (TRUE or MAG) to follow the magnetic reference for displaying the airport map on the ND.
(3) The CCD
- The OANS is interfaced with the CAPT CCD and the F/O CCD through two dedicated RS-422 serial links.
- Conversely, when the OANS image is not displayed, the OANS inhibits CCD commands.
B. With Display Means
- Electronic Instrument System (EIS) (Ref. AMM D/O 31-60-00-00)
- Display Management Computer (DMC) (Ref. AMM D/O 31-63-00-00)
(1) The EIS
- The CAPT and F/O NDs show the OANS display, the airport moving map and the OANS setting display window.
- This OANS setting display window replaces the Vertical Display (VD) on the CAPT and F/O NDs.
- The interactive mode between the OANC and this OANS setting display window is done through the CAPT and F/O CCDs.
- Optical links by optical fiber will be used to send the OANS video to the EIS.
- The protocol will be ASVI limited.
(2) The DMC
- The OANS is interfaced with three DMCs in order to provide the DMC with the necessary information to display the BTV, ROP and Runway Approaching Advisory.
- The OANS sends the information whether the soft control panel is displayed or not to the DMC via the ARINC 429 bus.
- This information is used to avoid overlapping with messages usually displayed on the EIS.
C. With Avionics Applications:
- Multi-Mode Receiver (MMR) (Ref. AMM D/O 34-36-00-00)
- Air Data/Inertial Reference System (ADIRS) (Ref. AMM D/O 34-12-00-00)
- Flight Management System (FMS) (Ref. AMM D/O 22-70-00-00)
- Flight Warning System (FWS) (Ref. AMM D/O 31-50-00-00)
- Landing Gear Control and Interface Unit (LGCIU) (Ref. AMM D/O 32-31-00-00)
- System Data Acquisition Concentrator (SDAC) (Ref. AMM D/O 31-50-00-00)
(1) The MMRs
The OANC receives the MMR1 and MMR2 data via the ARINC 429 bus to calculate the Global Positioning System (GPS) position of the aircraft.
In normal configuration, the OANC sends the MMR1 and MMR2 data respectively to the CAPT and F/O NDs to show the location of the aircraft on the airport moving map.
The OANC receives the MMR1 and MMR2 data via the ARINC 429 bus to calculate the Global Positioning System (GPS) position of the aircraft.
In normal configuration, the OANC sends the MMR1 and MMR2 data respectively to the CAPT and F/O NDs to show the location of the aircraft on the airport moving map.
(2) The ADIRS
The OANC receives Air Data Reference (ADR)/Inertial Reference (IR) data from the three Air Data/Inertial Reference Units (ADIRUs) via the ARINC 429 bus. In normal configuration, the OANC uses the data from ADIRU1 and ADIRU2 to show the aircraft heading, the ground speed, the airport selection, the aircraft location and the ADR/IR advisories respectively on the CAPT and F/O NDs.
The OANC receives the ADR and IR source selection, given respectively by the position of the AIR DATA and ATT HDG selector switches on panel 8VU: NORM, CAPT ON 3 or F/O ON 3.
The OANC receives Air Data Reference (ADR)/Inertial Reference (IR) data from the three Air Data/Inertial Reference Units (ADIRUs) via the ARINC 429 bus. In normal configuration, the OANC uses the data from ADIRU1 and ADIRU2 to show the aircraft heading, the ground speed, the airport selection, the aircraft location and the ADR/IR advisories respectively on the CAPT and F/O NDs.
The OANC receives the ADR and IR source selection, given respectively by the position of the AIR DATA and ATT HDG selector switches on panel 8VU: NORM, CAPT ON 3 or F/O ON 3.
(3) The FMS
The OANC receives the departure, alternate and destination airports from the two FMGECs via the ARINC 429 bus. In normal configuration, the OANC uses the information from the two active FMGCs to show the related data respectively on the CAPT and F/O NDs.
The OANC receives the departure, alternate and destination airports from the two FMGECs via the ARINC 429 bus. In normal configuration, the OANC uses the information from the two active FMGCs to show the related data respectively on the CAPT and F/O NDs.
(4) The FWS
The OANC receives the flight phases (approach, landing) from the Flight Warning Computer (FWC) via the ARINC 429 bus.
The OANC receives the flight phases (approach, landing) from the Flight Warning Computer (FWC) via the ARINC 429 bus.
(5) The LGCIU
- The Landing Gear on ground signal is transmitted to the OANS via the LGCIU discrete signal.
- This signal is used by the operational software, BITE, power management and data loading functions.
(6) The SDAC
- The OANC is interfaced with two SDACs via the ARINC 429 bus for the BTV function.
- These data are not used by the OANS, but forwarded to the FMGC.
6. Component Description
The OANS has a front panel access into which a mass memory card is engaged. This mass memory card is in PCMCIA standard format and hosts the ADB.
The downloading operation is done through the PDL connected on the OANS data loading connector (2148VC).
** ON A/C NOT FOR ALL The OANS has a front panel access into which a mass memory card is engaged. This mass memory card is in PCMCIA standard format and hosts the ADB.
The downloading operation is done through the PDL connected on the OANS data loading connector (2148VC).
7. Operation/Control and Indicating
A. Operation
In normal operation, the manual selection of an airport is not necessary. The OANC does automatic selections in relation to the current aircraft position and the FMS flight plan (departure, destination airport and alternate destination).
On the ground, before take-off, the FMS departure airport map is shown on the NDs.
In landing phases, the destination airport map is shown on the NDs. The OANS airport map replaces the FMS navigation map.
It is also possible to select manually an airport available on the ADB in PLAN mode, for consultation, through the OANS setting display window.
In normal operation, the manual selection of an airport is not necessary. The OANC does automatic selections in relation to the current aircraft position and the FMS flight plan (departure, destination airport and alternate destination).
On the ground, before take-off, the FMS departure airport map is shown on the NDs.
In landing phases, the destination airport map is shown on the NDs. The OANS airport map replaces the FMS navigation map.
It is also possible to select manually an airport available on the ADB in PLAN mode, for consultation, through the OANS setting display window.
B. Control
(1) The EFIS control panel
Each EFIS control panel controls the display and the range of the airport moving map transmitted by the OANS:
Each EFIS control panel controls the display and the range of the airport moving map transmitted by the OANS:
- 0.2NM, 0.5NM, 1NM, 2NM and 5NM.
- The general view is related to the range 1NM, 2NM and 5NM.
- The tactical navigation view is related to the range 0.5NM.
- The detailed view is related to the range 0.2NM.
(2) The NORTH REF switch
- The OANS is interfaced with the "NORTH REF" switch (TRUE or MAG) to follow the magnetic reference for displaying the airport map on the ND.
(3) The CCD
- The OANS is interfaced with the CAPT CCD and the F/O CCD through two dedicated RS-422 serial links.
- Conversely, when the OANS image is not displayed, the OANS inhibits CCD commands.
(4) The OANS setting display window
The OANS setting display window is controlled by the CCD.
It gives access to three tabs on the bottom part of the NDs:
The OANS setting display window is controlled by the CCD.
It gives access to three tabs on the bottom part of the NDs:
- MAP DATA tab: It gives access to specific selections about airport information (airport element information, map annotation, element centering).
- ARPT SEL tab: It gives access to a menu to make the airport selection (origin, alternate, destination airports). Then, it gives specific information related to the selected airport .
- STATUS tab: It shows the ADB information and gives access to the selection of the active or second database (these two ADBs are uploaded to the OANC)
C. Indicating
The OANS display is composed of two parts on each ND unit:
The OANS display is composed of two parts on each ND unit:
- The top part shows the airport moving map.
- The bottom part shows the OANS setting display window.
When the scale selector switch of the EFIS control panel is set to ZOOM and the mode selector switch is set to ARC, PLAN or NAV (not to VOR or LS), the OANC calculates a default airport moving map on the CAPT (F/O) ND.
The airport moving map has three display modes: - The ARC mode display has arcs of circles with the aircraft symbol as center. The aircraft symbol is always located in the middle of the bottom part of the map (nose up). The map moves around the aircraft symbol to show the aircraft location.
- The NAV mode display has circles with the aircraft symbol as center.
The aircraft symbol is always located in the middle of the map (nose up). The map moves around the aircraft symbol to show the aircraft location. - In PLAN mode, the aircraft symbol is free and moves on the map to show the aircraft location.
The display of this mode has two functions: - MOVE function: it gives an overview of the airport.
- CENTER function: it is used when the aircraft symbol is out of the display. It gives the display of the airport around the aircraft symbol.
8. BITE
The BITE of the OANS system:
The BITE of the OANS system:
- Makes an analysis of the monitoring and test results.
- Generates the related fault message.
- Sends these fault messages to the Centralized Fault Display Interface Unit (CFDIU) and memorizes them.
- Dialogs with the CFDIU to start interactive tests.
A. BITE Architecture
The OANS does the BITE function (System BITE) for the OANS.
The System BITE:
The OANS exchanges data with the CFDIU through two communication modes:
The normal mode and the interactive mode.
The OANS does the BITE function (System BITE) for the OANS.
The System BITE:
- Makes an analysis and correlates fault events.
- Sends fault messages to the CFDIU.
- Gives access to the tests in the interactive mode.
The OANS exchanges data with the CFDIU through two communication modes:
The normal mode and the interactive mode.
B. Normal mode
In normal mode, as soon as the OANS is energized, the OANS reports all the fault messages related to the OANS simultaneously to the CFDIU.
In normal mode, as soon as the OANS is energized, the OANS reports all the fault messages related to the OANS simultaneously to the CFDIU.
C. Interactive Mode
The OANS BITE has interactive system tests that are only available on the ground. They are started manually from the SYSTEM REPORT TEST page of the MCDU menu.
The system test is used to make sure that the OANS is operational for the flight. It includes:
The OANS BITE has interactive system tests that are only available on the ground. They are started manually from the SYSTEM REPORT TEST page of the MCDU menu.
The system test is used to make sure that the OANS is operational for the flight. It includes:
- Safety tests
- Validity check of external buses
- OPC status display on the ND
- Video output test
- Emission of results to the CFDIU