(g)
Memory card module The memory card interface is used to load data into the CPU or record data from the CPU. The memory card module supports either flash cards or RAM cards via the front panel Personal Computing Memory Card Interface Adapter (PCMCIA) slot. The flash card or RAM card is inserted through the front panel. In one mode, data stored on the flash card memory manual is used to update program or data memory in the RA. In another mode, the flash card functions as a data recorder.
(3) Not Applicable
**ON A/C ALL
(4) Digital outputs This table contains all the output parameters in the digital form. They are sorted as per the numerical order of their output label. The following table gives :
-EQ.SYS.LAB.SDI: (SDAC, FWC, DMC...) output label for which the parameter is available
-PARAMETER DEFINITION: parameter name
-WORD RANGE OPER RANGE RESOLUTION ACCURACY: measurement range. Maximum value transmitted. When the digital value changes, the change step is equal to the accuracy
-UNIT: unit in which the digital value is transmitted
-SIG BIT: indicates whether a sign bit is available
-BITS: number of bits used by the parameter in the label
-XMSN/INTV: output transmission interval. The refresh rate is given in milliseconds
-CODE :
BNR: binary data word
BCD: binary coded decimal data word
ISO: data word coded in ISO5 code
DIS: discrete data word
HEX: hexadecimal coded
HYB: mixed code
-ALPHA CODE: indicates the parameter mnemonic code
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-SOURCE ORIGIN: parameter source computer or system.
-------------------------------------------------------------------------------| PARAMETER LIST PARAMETER CHARACTERISTICS (NUMERIC) | -------------------------------------------------------------------------------|EQ.SYS.LAB.SDI|PARAMETER | WORD RANGE |UNIT|SIG |BITS|XMSN|CODE|ALPHA|SOURCE | | |DEFINITION| OPER RANGE | |BIT | |INTV| |CODE |ORIGIN | | |(*=REMARK)| RESOLUTION | | | | | | |BUS No.| | |(X=NOTE) | ACCURACY | | | | | | |ATA REF| | | | | | | | | | |CONV | -------------------------------------------------------------------------------| 164 |RADIO | 8192 | FT | 29 | 16 | 80 |BNR |RALT | | | |HEIGHT | 0.125 | | | | | | | | | | | | | | | | | | | -------------------------------------------------------------------------------
B. Antennas (Ref. Fig. 007) The transmission and reception antennas are identical. The small -thickness antenna is installed on the skin of the aircraft. Each antenna is supplied through a coaxial connector linked to the transceiver. The operating range of the antenna according to the attitude of the aircraft is limited to + or - 30. for roll and pitch.
C. Fans The six-blade fan is integral with a removable base plate attached under the transceiver mount. It is contained in a square aluminum alloy case. It is supplied with 115VAC through a connector and associated wiring connecting it to the transceiver. Interference is suppressed by a capacitor mounted on the fan case.
6. Operation
_________
A. Control In normal operation, system 1 automatically provides the height data for the CAPT PFD and system 2 for the F/O PFD. With failure of one system, the valid system is automatically switched to both CAPT and F/O PFDs. With failure of the two systems, the digits go out of view from the PFD : in place of the digits, a red RA warning message flashes during three seconds then remains on. For information : the pilot sets the DH on the MCDU. The Flight Warning Computer (FWC) generates the DH warning message. With loss of DH information, the DH data are not shown.
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Radio Altimeter - Antennas Figure 007
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B. Reconfiguration Switching In normal utilization, the radio altimeter data are shown on the CAPT PFD and F/O PFD through the Display Management Computers 1 and 2 (DMC). With failure of the radio altimeter transceiver 1, the DMC 1 and 2 automatically switch over to the transceiver 2. With failure of the DMC 1 (2), it is possible to switch over to the DMC 3 with the EIS DMC selector switch. This selector switch is located on panel 8VU on the center pedestal. In this case the DMC 3 totally replaces the DMC 1 (2) through the stage of the output switching relay of the failed DMC. With failure of the PFD, there is an automatic transfer of the PFD image onto the Navigation Display (ND). When you set the PFD potentiometer to OFF on panel 301VU (500VU), this causes :
-deactivation of the PFD
-transfer of the PFD image onto the ND.
7. Test
____
(Ref. Fig. 008)
**ON A/C 001-004, 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM NAVIGATION 导航3(79)
