(2)
The QAR will be turned on automatically when the ACMS circuit breaker is closed and start recording with an optical disk present if valid data is being received. The QAR recording can be manually controlled by the CDU or automatically controlled by the ACMS DMU logic.
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(3)
The front panel of the QAR has the following controls and indicators:
(a)
MODE: This pushbutton is used to get to the main menu display.
(b)
A + indicates an increase in a number shown on the display or go to a new menu.
(c)
A - indicates a decrease in a number shown on the display or go to a new menu.
(d)
SET: Selects a function that is shown on the display.
(e)
EJECT: A pushbutton to eject or remove the optical disk.CDU (AMM 34-61-00/001)
(1)
The center CDU provides cockpit crew with the capability of interacting with the ACMS while on board the airplane. It allows the cockpit crew to control the DMU, extract the information from the DMU and download the ACMS data to the output devices. The ACMS reports can be shown on the center CDU. In addition, any CDU can display CMCS messages.
(2)
The CDU contains a display area of 14 lines of 24 characters each. Data input is provided by a full alphanumeric keyboard as well as special function and control keys.
(3)
The DMU and center CDU communicate with an ARINC 429 low speed
input/output pair.ACARS Management Unit (AMM 23-27-00/001)
(1)
The ACARS management unit provides the airlines with the capability of automatically transferring information between the airplanes and ground based computer systems via radio transmission.
(2)
With ACARS, the DMU can send the ACMS reports directly to the ground station for data analysis. This process can be manually started from the center CDU or automatically started by the DMU. The interfacing of DMU with ACARS is through two low speed ARINC 429 buses.
Airborne Data Loader (ADL) (AMM 34-61-00/001)
(1)
The DMU provides CDU mask/menu to enable the CDU user to transfer memory contents between the DMU and the ADL. This process can be automatically started by the DMU or manually started from the center CDU. The ADL stores the ACMS data on a 3 1/2 inch floppy disk.
(2)
The DMU receives a ground enable discrete from the ADL switch when the ADL switch is set to the ACMS position. When the enable discrete to the DMU is grounded, the DMU will have an interface with ADL through two high ARINC 429 buses when commanded from the CDU.
(3)
The DMU output to the ADL is also sent to the ADL but it does not go through the ADL switch. This allows the ADL to record ACMS data continuously in flight.
Multi-input Printer (AMM 45-10-00/001)
(1)
The multi-input printer provides the airline personnel with hardcopy printouts of ACMS reports. The printer is a multi-input cockpit printer and is a shared resource with other airplane subsystems.
(2)
The DMU sends the ACMS reports to the multi-input printer. This process can be manually started from the center CDU or automatically started by the DMU.
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