(2)
Install the SEC (1) on its rack (3).
1EFF : ALL 1 27-94-34Page 405 1 1 May 01/01R 1 1 1CES 1
(3)
Push the SEC (1) on its rack (3) to connect the electrical connectors (2).
(4)
Engage the nuts (4) on the lugs and tighten.
R CAUTION : MAKE SURE THAT THE OBRM(S) IS (ARE) CORRECTLY INSTALLED. IF
_______ R IT (THEY) IS(ARE) NOT INSTALLED CORRECTLY, PUSH THE OBRM(S) UNTIL THE LOCKING DEVICES ARE LOCKED.
Subtask 27-94-34-865-052
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): FOR 1CE1 21CE1, 22CE FOR 1CE2 21CE2 FOR 1CE3 21CE3
Subtask 27-94-34-710-050
C. Do the operational test of the SEC (1CE1,1CE2,1CE3).
FOR 1CE1
(Ref. TASK 27-94-00-710-002)
FOR 1CE2
(Ref. TASK 27-94-00-710-003)
FOR 1CE3
(Ref. TASK 27-94-00-710-001)
5. Close-up
________
Subtask 27-94-34-410-050
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Install the protective cover on the battery power center 105VU.
(3)
Tighten the two screws.
(4)
Close the access door: 822 FOR 1CE1, 1CE2
R 824 (Ref. TASK 52-41-00-410-002) FOR 1CE3 811
(5) Remove the access platform(s).
FCDC SYSTEM (FLIGHT CONTROL DATA CONCENTRATOR) - DESCRIPTION AND OPERATION
__________________________________________________________________________
1. General
_______ R The Flight Control Data Concentrator (FCDC) is a part of the Electrical R Flight Control System (EFCS).
It is a centralized subsystem that provides access to EFCS status and
failure information.
The function of the FCDC is based on the validation and concentration of
in-flight and on-ground status and failure data.
The result of this operation will be stored in the FCDC failure memory or
sent back to the EFCS or transmitted to associated A/C subsystems.
2. Component Location
__________________
(Ref. Fig. 001)
-------------------------------------------------------------------------------FIN I FUNCTIONAL DESIGNATION I PANELIZONEIACCESS I ATA I I I I DOOR I REF.
-------------------------------------------------------------------------------3CE1 FCDC - 1 83VU 127 27-95-34 3CE2 FCDC - 2 84VU 128 27-95-34
FCDC - Location
Figure 001
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1 1 Feb 01/98
1 1
1CES 1
3. Power Supply____________ The FCDC 1 is supplied from DC essential bus bar 8PP and the FCDC 2 is supplied from DC normal bus bar 2PP. (Ref. 27-90 ELEC PWR SPLY - GENERAL) (Ref. Fig. 002)
A. Electrical Power
(Ref. Fig. 003)
(1)
Power supply The power supply is a two-stage power converter consisting of the following functional blocks :
-
the input EMI-filter
-
the boost stage
-
the DC/DC converter stage
-
the voltage monitor The module contains in addition to the basic functions, input protection circuits to cope with lightning strikes (category 1) and control circuits for overvoltage (30.3V) and undervoltage (18.5V) conditions. The output section of the power supply contains separate secondary windings for the plus or minus 15V supply. For safety reasons, there are five linear regulators each supplying an I/O section with plus or minus 15V. (Ref. Fig. 004) If one regulator fails, the performance of the others is not affected. The output voltage is monitored. Failure signals are generated in the case of over or undervoltage. The power supply has sufficient stored energy to allow the equipment full performance for power interrupts of up to 10ms. In the case of power interrupts longer than 10ms, a system reset signal is generated by the power supply module. The equipment continues operation when the input voltage is again within limits.
(2)
Power supply monitoring The monitor consists of the following four indepedent monitor blocks : (Ref. Fig. 003)
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