-FMGC2
 NOT SELECTED

 -CFDIU
 NOT SELECTED

 -ATSU
 NOT SELECTED

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 -ACMS
 NOT SELECTED

 -DFDRS
 NOT SELECTED

R **ON A/C 106-149, 151-199, 201-299, 301-399, 401-499,
 -TCAS
 NOT SELECTED

R **ON A/C 106-149, 303-399, 401-499,
 -DMC1
 NOT SELECTED

R **ON A/C 106-149, 151-199, 201-299, 301-399, 401-499,
 (b) List of messages when the loading procedure is in progress
 -DLRB
 SELECTED

 -FMGC1
 SELECTED

 -FMGC2
 SELECTED

 -CFDIU
 SELECTED

 -ATSU
 SELECTED

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 -ACMS
 SELECTED

 -FDR SYS
 SELECTED

R **ON A/C 106-149, 151-199, 201-299, 301-399, 401-499,
 -TCAS
 SELECTED

R **ON A/C 106-149, 303-399, 401-499,
 -DMC1
 SELECTED

R **ON A/C 106-149, 151-199, 201-299, 301-399, 401-499,
 (2) List of Fault messages
 (a) Selected channel failure after action SEL CTL key
 -DLRB CHAN FAIL PUSH SEL CTL
 -FMGC1 CHAN FAIL PUSH SEL CTL
 -FMGC2 CHAN FAIL PUSH SEL CTL
 -CFDIU CHAN FAIL PUSH SEL CTL
 -ATSU CHAN FAIL PUSH SEL CTL
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 -ACMS CHAN FAIL
 PUSH SEL CTL

 -FDR SYS CHAN FAIL
 PUSH SEL CTL

R **ON A/C 106-149, 151-199, 201-299, 301-399, 401-499,
 -TCAS CHAN FAIL
 PUSH SEL CTL

R **ON A/C 106-149, 303-399, 401-499,
 -DMC1 CHAN FAIL
 PUSH SEL CTL

R **ON A/C 106-149, 151-199, 201-299, 301-399, 401-499,
 (3) Other messages
 (a) Message when DLS is powered, when going through the step menu or at the end of the DLRB loading procedure
 DB/N:
 PUSH NEXT/PREV

 NOTE : the name of the data base follows the DB/N: indication
____ except if the DLRB has never been loaded.
 (b) Automatic display after failure of a DLRB loading procedure
 UP-LOADING ERROR
 PUSH SEL CTL
 Fault symptom origin:

 -unwritten in EEPROM data base
 -abnormal interrupt of the protocol with the MDDU (as per ARINC 615)
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 (c) STANDBY message
 STANDBY PUSH NEXT/PREV This menu is displayed before the programmed scrolling menu
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 6. Component Description
_____________________
 A. MDDU Description (Ref. Fig. 005) The front panel contains:
 -
a window with a 16-character alphanumeric LCD display

 -
a door protecting access to the disk drive (the display is always visible whether the access door is open or closed).

 (1)
 door closed the MDDU is protected against entry of dust and liquids.

 (2)
 door open the MDDU is not protected against entry of liquids.

 The disk drive is protected against entry of dust by its own internal protection.
 The MDDU can work with the door open or closed by the later method is preferable as shown by the KEEP DOOR CLOSED indication on the internal face of the door.
 The disk is ejected by means of a disk extraction pushbutton switch located below the disk access slot. This pushbutton switch can only be used when the access door is open.
 This switch is surrounded by a fluorescent label (green color).
 (3) Mechanical characteristics
 (a)
 Size

 (b)
 Weight: 1.975 kg

 (c)
 Attachment: by 4 quarter-turn fasteners.

 1_ Height: 95.2 mm
 2_ Width: 146 mm
 3_ Depth: 194.5 mm

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 Multipurpose Drive Disk (MDDU)
 Figure 005

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