Reactivation of the Additional Cockpit Electrical Supply System

TASK 25-18-00-440-802-A
Reactivation of the Additional Cockpit Electrical Supply System

FIN: 3NA ** ON A/C NOT FOR ALL

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

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
811

C. Referenced Information

REFERENCE	DESIGNATION
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 25-18-51-400-001-A	Installation of the Static Inverter
TASK 52-41-00-010-002-A	Open the Avionics Compartment Doors for Access
TASK 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access
Additional Cockpit Electrical System

3. Job Set-up
Subtask 25-18-00-860-050-A ** ON A/C NOT FOR ALL

A. Make sure that the electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002).

Subtask 25-18-00-865-051-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	PILOTS OUTLETS/STAT INV	1NA	K25
121VU	PILOTS OUTLETS/115V 60HZ	2NA	K23

Subtask 25-18-00-010-051-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position, at zone 120.
(2) Make sure that avionics compartment access-door 811 is open (Ref. AMM TASK 52-41-00-010-002).

4. Procedure
Subtask 25-18-00-440-050-A ** ON A/C NOT FOR ALL

A. Reactivation of the Additional Cockpit Electrical Supply System
(1) Remove the cable tie that holds the disconnected connector (1) and its harness on the structural part (3).
(2) Remove the cable tie that holds the protective sleeve (5) on the disconnected connector (1).
(3) Remove the protective sleeve (5) from the disconnected connector (1).
(4) Make sure to not damage the connector (1), contacts and cable during removal.
(5) Install the lacing tape (4) on the bonding cable connected to 522VN.
(6) Install the new static inverter (3NA) (Ref. AMM TASK 25-18-51-400-001).

5. Close-up
Subtask 25-18-00-865-052-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	PILOTS OUTLETS/STAT INV	1NA	K25
121VU	PILOTS OUTLETS/115V 60HZ	2NA	K23

Subtask 25-18-00-410-050-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close avionics compartment access-door 811 (Ref. AMM TASK 52-41-00-410-002).
(3) Remove the access platform(s).

Subtask 25-18-00-862-050-A ** ON A/C NOT FOR ALL

C. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.03.31 23:29:33 UTC