(f)
Check on one of the MCDUs that the software reference shown on the LRU IDENTIFICATION page of the computer concerned corresponds to the software reference of the disk used for uploading.
(3) Principle of downloading procedure
(a)
If there is no disk inserted in the data loader disk drive, the system is in the standby state and does not communicate with any onboard computers. The "MDDU READY" message is displayed on the data loader LCD.
(b)
The data loader is activated by inserting the formatted or unformatted empty disk containing a configuration file defining the label of the computer concerned by the downloading operation. After the data loader has processed the information contained in the configuration file, it initiates a wait phase. The READY message is displayed on the data loader LCD.
(c)
If the disk inserted in the drive is configured to dialog with the DMU, the operator can download the reports by pushing the SEL CTL key on the data loading selector.
(d)
After the computer has acknowledged the request, it sorts the data to be transferred into files and interrupts the wait phase established with the data loader. The WAIT RESPONSE message is displayed on the data loader LCD.
(e)
Then it downloads its information. The TRANSF IN PROG message is displayed on the data loader LCD throughout the transfer.
R 1EFF : 106-149, 151-199, 201-299, 301-399, 1 31-38-00Page 58 1401-499, 1Config-2 Aug 01/05 1 1 1CES 1 B. DLS
The data loading selector enables selection of a dedicated computer. An LCD display permits to show, in english, the name of the loadable systems. This system computer list can be updated via the portable data loader and a disk.
The data loading selector is powered by the DLRB. The DLS is operational on ground only.
The face comprises:
-a two-line LCD alphanumeric display
-three keys
-a power ON/OFF switch.
(1) Keys
Three tactile keys are used for target selection. The PREV and NEXT keys permit to scroll into the target list of LRUs. The SEL CTL key permits to select or deselect the desired LRU. This list of computers displayed on the DLS is extracted from the DLRB data base.
(a) PREV and NEXT keys
The operator scrolls forward and backward through the list of
loadable computers with PREV and NEXT keys.
(b) SEL CTL key
First push action on the SEL CTL key permits to select the displayed computer to be loaded. Second push action permits to deselect the previous computer.
C. DLRB
The DLRB allows selection between several target Line Replaceable Unit computers, (LRU), to be loaded by a data loader. The connection concerns ARINC 429 bi-directional buses and discrete associated Load Enable lines. The number of connected LRUs can grow up to 26.
The purpose of the DLRB is to do maintenance operation of target LRU on board the aircraft. The DLRB operates only in ground condition. In flight, inactive state is automatically entered.
R 1EFF : 106-149, 151-199, 201-299, 301-399, 1 31-38-00Page 59 1401-499, 1Config-2 Aug 01/05 1 1 1CES 1 The DLRB is controlled by an internal processor board. It contains a saved data base which stores the name of all addressable target computers. This data base can be updated by using the data loader and selecting the DLRB itself in the list of targets. So, it is possible to configure or reconfigure the system in compliance with aircraft configuration or update.
ARINC 615 protocol is used for updating DLRB data base from the data loader.
Equipment is provided with BITE capability for maintenance purpose and to assure good reliability of functional state of system. A discrete input on the DLRB is used for triggering BITE computation on request. A discrete output provides the BITE state.
The main functions of the DLRB are:
-switching the data loader ARINC429 bus to the desired LRU bus, including LOAD ENABLE outputs.
-interfacing with the operator through the DLS (LCD display, PREV, NEXT and SEL keys).
-reading the ON/OFF and AIR/GND discrete inputs to determine its functional state (active or inactive).
-uploading its data base on request.
-triggering its self-tests on CFDIU request and expressing BITE result on its NOT HEALTHY output.
-communicating with the maintenance terminal or test bench.
9. BITE
____
R **ON A/C 106-149, 155-199, 208-299, 301-399, 401-499,
A. DLRB BITE Test
The function of the Built-In Test Equipment (BITE) is to monitor the operation of the DLRB and DLS (via the DLRB), analyze and confirm faults but these faults are not stored in the Non-Volatile Memory (NVM). The DLRB/DLS is a type 3 system.
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