777 AIRCRAFT MAINTENANCE MANUAL
ACMS -QUICK ACCESS RECORDER
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ACMS -QUICK ACCESS RECORDER FUNCTIONAL DESCRIPTION
General
The QAR records data on a 128MB, 3.5 inch optical disk. The optical disk has a magnetic read/write surface and an optical tracking surface. An infra-red laser does the optical tracking. The disk holds 41 hours of recorded data.
Digital Data
There are four digital data buses between the AIMS CPM/ Comm and the QAR. These are two ARINC 717 buses and two RS422 buses.
The CPM/Comm sends a synch pulse to the QAR on an ARINC 717 bus. The QAR uses this synch pulse to ensure that raw data synchronizes.
The CPM/Comm sends ACMF data to the QAR on an ARINC 717 bus. The QAR records this data.
The CPM/Comm sends control data to the QAR on a RS422 bus. The control data turns on the QAR.
The QAR sends data and status to the CPM/Comm on a RS422 bus. The ACMF monitors the data and status.
Discretes
The QAR sends two discretes to the IOMs in the left AIMS cabinet. The two discretes are QAR status and tape low.
Processing
When the QAR receives data from the CPM/Comm, the central processing unit (CPU) does a self test to do a validity check. The CPU then sends control information to the formatter and flash memory. The CPU monitors all QAR circuits for failures. It also monitors the status of the drive circuits for tape level information.
Flash memory holds configuration data, system data, and identification files.
The formatter arranges the data received from flash memory and sends it to the cartridge drive circuits.
The cartridge drive circuits control the position of the laser tracking/magnetic recording head. They also write data on and read data from the optical disk.
You use the front panel keyboard to read information from the optical disk and to run functional tests.
The CPU sends data to the display. It shows stored data, QAR menus, test results, and messages.
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ACMS -ACMF FUNCTIONAL DESCRIPTION
General
The ACMF gets airplane system data, records the data, and creates reports.
Data Collection
The ACMF can process:
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ARINC 429 or ARINC 629 data received by the left AIMS cabinet
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ARINC 429 data received by only the right AIMS cabinet
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Analog and discrete input data to the left and right AIMS cabinets
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Data that communicates between the AIMS software partitions
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Data that goes from the left AIMS cabinet to ARINC 429 buses and ARINC 629 buses.
From the four IOMs or the other CPMs, this data transmits through the backplane bus to the ACMF.
CPM/ACMF
Only the left AIMS cabinet has a CPM/ACMF. The CPM/ACMF has 6 megabytes of volatile RAM to store reports.
The CPM/ACMF contains the ACMF software. There are different parts of the software. The parts include these:
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ACMF operational program software (OPS)
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AIMS operational program configuration file (OPC)
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* ACMF airline modifiable information (AMI).
The ACMF operational program software is standard and the airlines can not customize it. It does these things:
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Evaluates the triggers
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Gets the data
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Compresses the data
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Prepares the reports.
The ACMF AMI sets the:
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Report formats
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Triggers to record data
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Customized menus, display formats, and MAT ACMS features.
The ACMF AMI also contains the onboard signal database. This database has all the available signals to the ACMF.
CPM/Comm
The ACMF sends data to these functions in the CPM/Comm:
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Data communication management function (DCMF)
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Quick access recording function (QARF)
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Central maintenance computing function (CMCF).
The DCMF controls these interfaces:
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Onboard local area netework (OLAN) for MAT/PMAT
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