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 B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
121VU RCDR/ACCLRM 9TU K18

R **ON A/C 106-149, 211-299, 301-399, 401-499,
 121VU AIDS & RCDR/FDIMU 5TV K15 **ON A/C 151-199, 201-210,
 121VU AIDS/DMU 4TV K15 R **ON A/C 106-149, 151-199, 201-299, 301-399, 401-499,
 4. Procedure
_________
 (Ref. Fig. 401/TASK 31-36-52-991-001)
 Subtask 31-36-52-420-050

 A. Installation of the Digital AIDS Recorder (DAR)
 (1)
 Clean the component interface and/or the adjacent area.

 (2)
 Do an inspection of the component interface and/or the adjacent area.

 (3)
 Remove the blanking caps from the electrical connectors (2).

 (4)
 Make sure that the electrical connectors (2) are clean and in the correct condition.

 (5)
 Intall the DAR (1) on its rack (3).

 (6)
 Push the DAR (1) on its rack (3) to connect the electrical connectors (2).

 (7)
 Engage the nuts (4) on the lugs (5) and tighten.

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 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 9TU, 4TV, 5TV
 Subtask 31-36-52-710-051
 C. Do the operational test of the DAR (Ref. TASK 31-36-00-740-003).
 5. Close-up
________ Subtask 31-36-52-410-050
 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Close the access door 824. (Ref. TASK 52-41-00-410-002)

 (3)
 Remove the access platform(s).

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__________________________________________________________
 1. General
_______
 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-210,
 The parameter set sampled by the DMU contains parameters used for condition monitoring. All other parameters from the connected system busses are also sampled.

R **ON A/C 106-149, 211-299, 301-399, 401-499,
 The parameter set sampled by the FDIMU (DMU-Part) contains parameters used for condition monitoring. All other parameters from the connected system busses are also sampled.
 **ON A/C ALL
 2. System description
__________________
 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-210,
 A. Architecture of Inputs
 (Ref. Fig. 001, 002)
 The DMU is connected to various source systems to collect the whole
 parameter set. The block diagram of input sources shows the connection of
 the DMU to the respective sources.

R **ON A/C 106-149, 211-299, 301-399, 401-499,
 A. Architecture of Inputs
 (Ref. Fig. 001A, 002A)
 The FDIMU (DMU-Part) is connected to various source systems to collect
 the whole parameter set. The block diagram of input sources shows the
 connection of the FDIMU (DMU-Part) to the respective sources.

 1EFF : ALL 1 31-37-00Page 1 1 1 Aug 01/05 1 1 1CES 1

 DMU Source Block Diagram (sheet 1/2)
 Figure 001

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 FDIMU (DMU-Part) Source Block Diagram (sheet 1/2)
 Figure 001A

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 DMU Source Block Diagram (sheet 2/2)
 Figure 002
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 FDIMU (DMU-Part) Source Block Diagram (sheet 2/2)
 Figure 002A
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 (1) Power Supply of Input Sources All parameter source systems are supplied by their own system power supplies.
 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-210,
 B. Parameters
 C. DMU Input Parameters All DMU parameters are listed in the parameters list. The DMU uses these parameters to perform the various functions. Also the DMU internal parameters and parameters on Output Bus A+B and listed in the parameters list. For all calculations, logical decisions and parameters to be included in a print report only valid parameters are used. If there is no valid parameter available, the corresponding parameter column is filled with '<'. If a parameter, which is defined to be included in a print report, is not transmitted on the appropriate 'ARINC' bus, the corresponding data field is filled with '>'. If a parameter, which is used for a logical decision, is invalid or not transmitted during the whole flight phase, (in which it is intended to be used), this causes a class 3 fault. For average calculations valid parameters only are used. The validity of a parameter is detected by monitoring the SSM bits. Also the parity bit of the appropriate ARINC 429 word. If a parameter fail is detected, the alternative system 2 parameter is used if possible. If an alternative parameter is used, this is indicated by an associated to the parameter number, for all the various functional descriptions. If a parameter which is used for logics is invalid or not transmitted, or an alternative parameter is not available, the previous good value is used for up to three reads. After three consecutive reads this parameter is marked as failed and the logic is not performed. Means are provided to observe also those busses which are not permanently used for the logics or reports.
　
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