Installation of the Yellow Electric Pump Current Transformer

TASK 29-24-15-400-001-A
Installation of the Yellow Electric Pump Current Transformer

WARNING: ISOLATE ALL THE AIRCRAFT ELECTRICAL CIRCUITS.

CAUTION: MAKE MATCH MARKS ON ALL THE ELECTRICAL WIRES BEFORE YOU DISCONNECT THEM. INCORRECT CONNECTION OF WIRES WILL CAUSE DAMAGE TO EQUIPMENT.

FIN: 3807GX

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT)
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
121AL, 822

C. Referenced Information

REFERENCE	DESIGNATION
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 29-24-00-710-002-A	Operational Test of the Phase Unbalance Detector and the Current Transformer of the Yellow Hydraulic System
Yellow Electric Pump Current Transformer

3. Job Set-up
Subtask 29-24-15-860-051-A

A. Aircraft Maintenance Configuration
(1) Make sure that the external power connector is not connected to the aircraft receptacle (20XG) (receptacle behind the access door 121AL).
(2) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position at the zone 121.
(3) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position at the zone 126.
(4) Make sure that the access door 822 is open.
(5) Make sure that the access cover (1) is removed.

Subtask 29-24-15-941-052-A

B. Safety Precautions
(1) Make sure that the WARNING NOTICE(S) is (are) in position on the access door 121AL to tell persons not to connect the external power connector.
(2) In the cockpit, on the overhead panel 35VU, make sure that these pushbutton switches are released:

APU GEN,
1 BAT 2,
GEN 1, GEN 2,
EXT PWR.

(3) In the cockpit, make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to operate the pushbutton switches on these overhead panels:

21VU (EMER ELEC PWR),
25VU (APU),
35VU (ELEC).

4. Procedure
Subtask 29-24-15-420-050-A

A. Installation of the Yellow Electric Pump Current Transformer
(1) Engage the electrical wires (8) in their passages in the transformer (7).
(2) Install the transformer (7) on its mount.
(3) Install the washers (6) and the screws (5).
(4) Connect the electrical wires (8) to the contactor (2).
(5) Install the washers (4) and the nuts (3).
(6) Remove the blanking cap from the electrical connector (9).
(7) Connect the electrical connector (9) to the transformer (7).

Subtask 29-24-15-865-053-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N30
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N31
** ON A/C ALL
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

Subtask 29-24-15-861-050-A

C. Preparation before the Test
On the overhead panel 35VU, push these pushbutton switches:

APU GEN,
GEN 1, GEN 2.

Subtask 29-24-15-710-050-A

D. Operational Test
(1) Do the operational test of the transformer (Ref. AMM TASK 29-24-00-710-002).

5. Close-up
Subtask 29-24-15-860-052-A

A. Aircraft Maintenance Configuration
(1) Remove the WARNING NOTICE(S).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Remove the access platform(s).
(4) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 29-24-15-410-050-A

B. Close Access
(1) Install the access cover (1) on the panel 107VU.
(2) Close the access door 822.

[Rev.10 from 2021] 2026.04.01 00:26:59 UTC