Installation of the Essential TR Contactor

TASK 24-34-55-400-001-A
Installation of the Essential TR Contactor

ZONE: 125
FIN: 3PE

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) - ADJUSTABLE
No specific	Torque wrench: range to between 0.30 and 0.27 m.daN (26.55 and 23.89 lbf.in )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
125	LATERAL AVIONIC COMPARTMENT
812, 822

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-24-00-710-001-A	Operational Check of Emergency Generating System
Essential TR Contactor

3. Job Set-up
Subtask 24-34-55-860-050-A

A. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position at the access doors 812 and 822.
(2) Make sure that the access doors 812 and 822 are open.
(3) In the avionics compartment, make sure that the access panel of the AC/DC emergency power center 106VU and BATTERY power center 105VU are open.

Subtask 24-34-55-865-051-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
105VU	ELEC/CSM/G /EV AUTO/SPLY	7XE	C01
106VU	CSM/G /EV/MAN/SPLY	6XE	B04
106VU	ESS TR/SPLY	4PE	C01
122VU	ELEC/CNTOR/ESS/DC BUS/TIE	3PC	W26
123VU	AC ESS/BUS ON/BUS 1	1XC	AC12
123VU	AC ESS/BUS ON/BUS 2	2XC	AC01

4. Procedure

CAUTION: MAKE SURE THAT THE CONTACTOR LOCATING PIN IS CORRECTLY ENGAGED IN ITS RECESS LOCATED IN ONE POWER TERMINAL. THIS PREVENTS DAMAGE TO THE LOCATING PIN WHEN YOU APPLY THE TORQUE.

Subtask 24-34-55-420-050-A

A. Installation of the Contactor
(1) Install the contactor (5) in position on the tapped barrels (6) of the connecting base (1).
(2) TORQUE the captive screws (3) to between 0.30 and 0.27 m.daN (26.55 and 23.89 lbf.in )

.
(3) Remove the CAP-BLANKING from each electrical connector and receptacle.
(4) Make sure that all the electrical connections are clean and in the correct condition.
(5) Connect the connector (4) on the contactor (5).

Subtask 24-34-55-865-052-A

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
105VU	ELEC/CSM/G /EV AUTO/SPLY	7XE	C01
106VU	CSM/G /EV/MAN/SPLY	6XE	B04
106VU	ESS TR/SPLY	4PE	C01
122VU	ELEC/CNTOR/ESS/DC BUS/TIE	3PC	W26
123VU	AC ESS/BUS ON/BUS 1	1XC	AC12
123VU	AC ESS/BUS ON/BUS 2	2XC	AC01

Subtask 24-34-55-710-050-A

C. Operational Test of the Emergency Generation System
(1) Do an operational test of the Emergency Generation System (Ref. AMM TASK 24-24-00-710-001).

5. Close-up
Subtask 24-34-55-410-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) In the avionics compartment, close the access panels of the AC/DC emergency power center 106VU and the BATTERY power center 105VU.
(3) Close the access doors 812 and 822.
(4) Remove the access platform(s).

[Rev.10 from 2021] 2026.03.31 23:23:34 UTC