Clock - Internal Block Diagram
Figure 006
R 1EFF : 001-049, 051-099, 101-105, 201-203, 1 31-21-00Page 19 1 1 May 01/05 1 1 1CES 1
Clock - Internal Block Diagram
Figure 006A
R 1EFF : 106-149, 151-199, 201-299, 301-399, 1 31-21-00Page 20 1401-499, 1Aug 01/05 1 1 1CES 1 **ON A/C ALL
The clock provides UTC to the FMGC 1 and 2, the FDIU and the CFDIU. UTC is
provided to the users in the form of an ARINC 429 bus.
Time is encoded to label 125 in BCD format and label 150 in BNR format.
Date is encoded to label 260 in BCD format.
Equipment identification is encoded to label 377 in HEX format
(identification 031).
A. Sequence and Rating
Parameter sequence on the output bus is as follows :
(1)
UTC in BCD format : label 125.
(2)
UTC in BNR format : label 150.
(3)
Date in BCD format : label 260.
(4)
Equipment identification in HEX format : label 377. The transmission rate is one parameter every 31.25 ms, the whole period being 125 ms.
B. Word Structure
(Ref. Fig. 007)
5. Operation
_________
A. Normal Conditions
-Instruments are powered normally
-Perform test of displays : place ANN LT switch located on panel 25VU in TEST position. Make certain that all displays show 8's (2 seconds on, 1 second off).
B. Failure Configuration
(1)
Clock failure
-displays go off.
(2)
Failure of electrical power supply.
1EFF : ALL 1 31-21-00Page 21 1 1 May 01/05R 1 1 1CES 1
ARINC Word Structure Figure 007
1EFF : 1 1R 1CES ALL 1 11 1 31-21-00 Page 22 May 01/05
**ON A/C 001-049, 051-099, 101-105, 201-203,
(a) Loss of main electrical power supply (aircraft bus):
-displays go off
-the chrono pointer stops
-ARINC output disabled
-time is still counted in memory through the A/C battery supply. When the power is restored:
-
the pointer resumes its operation
-
the correct time is displayed again.
(b) Loss of aircraft battery power supply:
The time keeping function is lost.
R **ON A/C 106-149, 151-199, 201-299, 301-399, 401-499,
Post SB 31-1133 For A/C 201-203,
(a) Loss of main electrical power supply (aircraft bus):
-displays go off
-ARINC output disabled
-time is still counted in memory through the A/C battery supply.
-all pushbuttons are desabled
When the power is restored:
-the correct time is displayed again.
(b) Loss of aircraft battery power supply: The time keeping function is lost, but can be recovered through the GPS channel after the battery power has been restored (switch to GPS mode).
**ON A/C ALL
(c) Loss of main and aircraft battery power supplies: The clock does not operate.
1EFF : ALL 1 31-21-00Page 23 1 1 Aug 01/05 1 1 1CES 1 ELECTRICAL CLOCK - ADJUSTMENT/TEST
__________________________________
TASK 31-21-00-750-002
Procedure to set the Clock
WARNING : MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE
_______
YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT.
1.
Reason for the Job
__________________
Self Explanatory
2.
Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power
**ON A/C 001-049, 051-099, 101-105, 201-203,
31-21-00-991-001 Fig. 501
R **ON A/C 106-149, 151-199, 201-299, 301-399, 401-499, Post SB 31-1133 For A/C 201-203, 31-21-00-991-001-A Fig. 501A **ON A/C ALL
3. Job Set-up
__________
Subtask 31-21-00-861-050
A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).
1EFF : ALL 1 31-21-00Page 501 1 1 Aug 01/05 1 1 1CES 1 Subtask 31-21-00-865-050
B. Make sure that this(these) circuit breaker(s) is(are) closed:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU CLOCK/NORM/SPLY 6FS F11
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