-
logic 1 : the computer detects a permanent ground.

 (4)
 P+ off

 -
logic 1 : the computer detects disappearance of +28VDC

 -
logic 0 : the computer detects permanent +28VDC.

 NOTE : Some discretes are inversed (P- at logic 1 : ground) for their
____
 use in the logics.

 There are also output discretes. Controlled by the computer, logic 1 is represented by a ground and logic 0 by open circuit. They permit illumination of an annunciator light or closing of a relay.
 B. Boolean on Bus
 These data have two states.
 The computer copies the state of the corresponding bit on one of the ARINC buses addressed to the computer on its input port. Inversely, at output, the computer puts label bits assigned to booleans to be transmitted on its data bus. For example, the computer sets the label 126 SDI 10 bit 9 to 1 on its data bus when it computes AP OFF WARNING.
 C. Digital on Bus
 The received data requires a large number of bits available on an input bus label.
 E.g., on label 370 (SDI : 01) from DMC/L, 16 bits are used for DECISION HEIGHT which gives a range of 8192 feet for a resolution of 0.125 feet. In the same way on label 173 (SDI : 01) from ILS 1 receiver, 12 bits are used for LOC DEVIATION which gives a range of 0.4DDM for a resolution of 0.0001 DDM.
 D. Analog on Synchro
 The data received on three of the input pins is of the same type as that which normally supplies an indicator with a pointer (the combination of amplitudes of the three voltages at 400 Hz privileges a direction in a plane). Therefore the data is essentially angular.
R 1EFF : 001-049, 062-099, 101-149, 151-199, 1 31-52-00Page 2 1201-299, 301-399, 401-499, 1Config-2 Aug 01/05 1 1 1CES 1 E. Power Supplies

 The FWC 1 is supplied by the 115VAC ESS BUS 401 XP-C via circuit breaker
 3WW.
 The FWC 2 is supplied by the 115VAC BUS 2 204 XP-A via circuit breaker
 2WW.

 F. Miscellaneous
 Certain pins are assigned to signals other than those mentioned above. For example, signals which synchronize audio outputs or test pins intended for software development.
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 3. Interface Tables
________________
 A. Interface Tables
 All input/output signals are given in tabular form in the ECAM System Logic Data (ESLD) (FWC Signals).
R 1EFF : 001-049, 062-099, 101-149, 151-199, 1 31-52-00Page 4 1201-299, 301-399, 401-499, 1Config-2 Aug 01/05 1 1 1CES 1

 LOUD SPEAKER (7WW,8WW) - REMOVAL/INSTALLATION
_____________________________________________ TASK 31-53-21-000-001 Removal of the Loudspeakers (7WW,8WW)
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific circuit breaker(s) safety clip(s) FOR FIN 8WW No specific blanking caps
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
31-53-21-991-001 Fig. 401
 3. Job Set-up
__________ Subtask 31-53-21-865-050
 A. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------FOR 7WW
 49VU CAPT/LOUD/SPKR 5WW F10 FOR 8WW 121VU EIS/F/O/LOUD/SPKR 4WW P08
 1EFF : ALL 1 31-53-21Page 401 1 1 Feb 01/98 1 1 1CES 1

 4. Procedure
_________
 (Ref. Fig. 401/TASK 31-53-21-991-001) Subtask 31-53-21-020-050
 A. Removal of the Loudspeakers
 (1)
 FOR 7WW Remove the thermoformed cover from the left instrument panel. FOR 8WW Remove the thermoformed cover from the right instrument panel.

 (2)
 Loosen the four locking screws (3). Hold the loudspeaker (4).

 (3)
 Remove the loudspeaker (4) from its housing (5).

 (4)
 Disconnect the connector (1) from its receptacle (2).

 (5)
 Remove the loudspeaker (4).

 (6)
 Put the blanking caps on the electrical connectors (1) and (2).

 1EFF : ALL 1 31-53-21Page 402 1 1 Feb 01/98 1 1 1CES 1
　
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