Removal of the Additional Center-Tank (ACT) Relay-Box

TASK 25-71-11-000-001-A
Removal of the Additional Center-Tank (ACT) Relay-Box

ZONE: 122
FIN: 802VU ** 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	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
122	AVIONICS COMPARTMENT
822

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)
Additional Center Tank (ACT) Relay Box

3. Job Set-up
Subtask 25-71-11-861-050-A ** ON A/C NOT FOR ALL

A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 25-71-11-010-050-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the access door 822.
(2) Open the access door 822.

Subtask 25-71-11-865-050-A ** ON A/C NOT FOR ALL

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	ACT1/REFUEL & SPLY	33QU	L29
121VU	ACT XFR VALVE MAN CTL	30QH	N29
121VU	ACT1/CTL & SPLY	9QH	P29
** ON A/C NOT FOR ALL
121VU	ACT2/REFUEL & SPLY	34QU	L28
121VU	ACT2/CTL & SPLY	10QH	P28

4. Procedure
Subtask 25-71-11-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the ACT Relay Box
(1) Remove the four screws (3) and the cover (2).
(2) Disconnect the electrical connectors (4) and (5) from the relay box (1).

NOTE: Identify the two connectors before disconnection.

(3) Remove the two screws (6) on each side of the relay box (1).
(4) Remove the relay box (1) from the mounting assy (8).
(5) Remove and keep the four clip nuts (7).
(6) Remove the four screws (9) and the mounting assy (8).

[Rev.10 from 2021] 2026.03.31 23:41:54 UTC