-workshop maintenance software.
Operational software
The operational software comprises:
-
the functional software,
-
the monitoring and test software.
The functional software (braking control, anti-skid, ARINC 429
management...) is integrated on the control channel.
The monitoring and test software is integrated on the monitoring
channel.
The operational software is divided into modules as per the IDEFO
method (ICAM Definition Method). The corresponding diagrams are
given in the figures below:
(Ref. Fig. 041, 042, 043, 044, 045, 046, 047, 048, 049)
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BSCU Operational Software
Figure 041
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BSCU Operational Software
Figure 042
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BSCU Operational Software
Figure 043
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BSCU Operational Software
Figure 044
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BSCU Operational Software
Figure 044A
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BSCU Operational Software
Figure 045
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BSCU Operational Software
Figure 045A
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BSCU Operational Software
Figure 046
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BSCU Operational Software
Figure 047
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BSCU Operational Software
Figure 048
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BSCU Operational Software
Figure 049
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L. Braking/Steering Control Unit (BSCU) The BSCU is installed in a 6MCU-size case in rack 90VU (Shelf 94VU). Its functions are:
-
Braking control through the servovalves and the pressure transducers,
-
Braking regulation through the check of the speed of each braked wheel,
-Integrated monitoring with memorization of the failures which come from the different LRUs of the system. It permits to locate the failures during maintenance operations, from the CFDS.
-Automatic braking control via a braking order. The braking order is servoed to control the A/C acceleration rate according to a predetermined deceleration rate.
-Nosewheel steering control through a hydraulic block and an actuating cylinder (Ref. 32-50),
-Conversion into ARINC 429 data of the brake temperatures which come from the Brake Temperature Monitoring Units (BTMU) attached to the main landing gear.
All the functions use the digital technology.
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(1) Description of the BSCU (Ref. Fig. 036A) The BSCU has:
-Two power supply units (one for each system)
-An ARINC 600 connector at the back (Size 2, 400 contacts).
-A rear interface with a specific cover to protect the unit against EMI.
-Six electronic boards The dimensions of these boards are 225 x 175 mm. They are installed vertically and lengthwise in the case. They are connected together and to the rear interface by means of two connectors that occupy the totality of their backplanes. There are two identical sets of three boards that form the systems 1 and 2: two Input/Output boards and one CPU board. Each board with a CPU is connected to an On-Board Reprogrammable Module (OBRM) that includes PROMs.
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