Deactivation of Transformer Rectifier TR2 (FAA only)

TASK 24-30-00-040-003-A
Deactivation of Transformer Rectifier TR2 (FAA only)

1. Reason for the Job
MMEL 24-30-01
TRANSFORMER/RECTIFIER UNITS (TR) (FAA ONLY)

NOTE: This task is applicable to aircraft that the FAA controls. For non-FAA aircraft, the task that follows is applicable (Ref. AMM TASK 24-30-00-040-002).

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Referenced Information

REFERENCE	DESIGNATION
TASK 24-30-00-040-002-A	Deactivation of the Transformer Rectifier TR2
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure

3. Job Set-up
Subtask 24-30-00-860-059-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(3) On the ELEC panel 35VU, make sure that:

The AC ESS FEED pushbutton switch is pushed (the ALTN legend is off).

Subtask 24-30-00-865-053-A

B. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
106VU	AC ESS BUS/STBY/CNTOR/CTL	5XC	B08
106VU	AC ESS/BUS NORM/CNTOR/CTL	4XC	B03
123VU	AC ESS/BUS ON/BUS 1	1XC	AC12
123VU	AC ESS/BUS ON/BUS 2	2XC	AC01
124VU	TR2/CNTOR/SPLY	4PU2	BC01

4. Procedure
Subtask 24-30-00-040-056-A

A. Deactivation of TR2 if the AC ESS FEED Control Is Serviceable
(1) Operational test of the AC essential-generation switching-system.

ACTION	RESULT
1.On the ECAM control panel: Push the ELEC key.	On the lower ECAM Display Unit (DU), on the "ELEC" page: A green bar comes into view between the AC1 and AC ESS busbars. This shows that the AC1 busbar energizes the AC ESS busbar.
2.On panel 123VU: Open circuit breaker 1XC.	On F/O glareshield panel 130VU: The MASTER CAUT light comes on.
	You can hear the single chime.
	The upper ECAM DU becomes black.
	These indications come into view on the upper ECAM DU and move to the lower ECAM DU: "ELEC AC ESS BUS FAULT", and " AC ESS FEED".
	On ELEC panel 35VU: The FAULT legend of the AC ESS FEED pushbutton switch comes on.
3.On ELEC panel 35VU: Release the AC ESS FEED pushbutton switch.	On ELEC panel 35VU: The FAULT legend of the AC ESS FEED pushbutton switch goes off. The ALTN legend of the AC ESS FEED pushbutton switch comes on. The self-test is in progress on the upper ECAM DU.
4.Wait for the self-test to be completed on the upper ECAM DU: Set the upper ECAM DU to OFF, then to ON with the brightness potentiometer.	On the upper ECAM DU: The Engine/Warning Display (EWD) comes into view. On the lower ECAM DU: The SD comes into view.
5.On the ECAM control panel: Push the ELEC key.	On the lower ECAM DU, on the "ELEC" page: A green bar comes into view between the AC2 and AC ESS busbars. This shows that the AC2 busbar energizes the AC ESS busbar. The green bar between the AC1 and AC ESS busbars goes out of view.
6.On panel 123VU: Close circuit breaker 1XC.
7.On ELEC panel 35VU: Push the AC ESS FEED pushbutton switch.	On ELEC panel 35VU: The ALTN legend of the AC ESS FEED pushbutton switch goes off.
	On the "ELEC" page: The green bar between the AC2 and AC ESS busbars goes out of view. The green bar between the AC1 and AC ESS busbars comes into view.

Subtask 24-30-00-040-054-A

B. Deactivation of TR2
(1) Open, safety and tag this(these) circuit breaker(s):

[4PU2] .

(2) On the SD, on the "ELEC" page:

Ignore the indications related to TR2.
Do a check of the voltages of TR1 and the Essential (ESS) TR. The two voltages must be equal to or more than 27V.

(3) On the ELEC panel 35VU, release BAT 1 and BAT 2 pushbutton switches (on these pushbutton switches, the OFF legend comes on).
(4) On the battery voltage indicator, do a check of the voltages of BAT1 and BAT2. The two voltages must be equal to or more than 25.5V.

5. Close-up
Subtask 24-30-00-860-058-A

A. Aircraft Maintenance Configuration
(1) On the ELEC panel 35VU, push BAT 1 and BAT 2 pushbutton switches (on these pushbutton switches, the OFF legend goes off).
(2) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(3) Make an entry in the logbook.
(4) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(5) Make sure that the work area is clean and clear of tools and other items.

[Rev.10 from 2021] 2026.03.31 23:23:07 UTC