R 106VU 26VAC/ESS BUS/SPLY 4XH B06 R
4. Procedure
_________
(Ref. Fig. 401/TASK 24-52-51-991-001)
Subtask 24-52-51-020-050
A. Removal of the Autotransformer
(1)
Disconnect the electrical connector (3).
(2)
Put blanking caps on the disconnected electrical connectors.
(3)
Loosen the 4 screws (4).
(4)
Hold the transformer (1).
(5)
Remove the screws (4) and the washers (5).
(6)
Remove the transformer (1).
AutoTransformer
Figure 401/TASK 24-52-51-991-001
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TASK 24-52-51-400-001
Installation of the Essential 115/26VAC Autotransformer (5XH)
1.
Reason for the Job
__________________
Self Explanatory
2.
Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific access platform 1.8 m (5 ft. 11 in.)
B. 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 24-42-00-861-001 Energize the Ground Service Network from the External Power 24-52-51-991-001 Fig. 401
3. Job Set-up
__________ Subtask 24-52-51-860-050
A. Aircraft Maintenance Configuration
(1)
Make sure that the ground service network is energized
(Ref. TASK 24-42-00-861-001).
(2)
Make sure that the access platform is in position at the access door
812.
(3)
Make sure that the access door 812 is open.
(4)
Make sure that the access panel of the AC/DC emergency power center 106VU is open.
Subtask 24-52-51-865-051
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
R 106VU 26VAC/ESS BUS/SPLY 4XH B06 R
4. Procedure
_________
(Ref. Fig. 401/TASK 24-52-51-991-001)
Subtask 24-52-51-420-050
A. Installation of the Autotransformer
(1)
Put the transformer (1) in position.
(2)
Install the washers (5) and the screws (4), then tighten the screws.
(3)
Remove the blanking caps from the electrical connectors.
(4)
Make sure that the electrical connectors are clean and in the correct condition.
(5) Connect the electrical connector (3).
Subtask 24-52-51-865-052
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 4XH Subtask 24-52-51-710-050
C. Test of the Essential 115/26 VAC Autotransformer
(1)
Energize the aircraft electrical circuits
(Ref. TASK 24-41-00-861-002).
(2)
On the ADIRS CDU, put the OFF/NAV/ATT selector switch of the ADIRU 1 and ADIRU 3 in NAV position.
(3)
Make sure that the FAULT legend on the ADR 1 and ADR 3 pushbutton switches does not stay on.
(4)
De-energize the aircraft electrical circuits
(Ref. TASK 24-41-00-862-002).
5. Close-up
________ Subtask 24-52-51-410-050
A. Close Access
(1)
In the avionics compartment, close the access panel of the AC/DC emergency power center 106VU.
(2)
Close the access door 812.
(3)
Remove the access platform(s).
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CONTACTOR (8XH) - REMOVAL/INSTALLATION
______________________________________ TASK 24-52-55-000-001 Removal of the AC Shed Essential Bus Contactor (8XH)
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