Clean Grid of Relay Box VU Panels

TASK 12-21-13-100-002-A
Clean Grid of Relay Box VU Panels

NOTE: This task can contribute to fuel savings.

ZONE: 120
FIN: 103VU
FIN: 106VU
FIN: 107VU
FIN: 70VU

1. Reason for the Job
Refer to the MPD TASK: 212600-09
CLEAN GRID OF RELAY BOX VU PANELS

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	BRUSH - BRISTLED, SOFT
No specific	AR	VACUUM CLEANER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
120	AVIONICS COMPARTMENT
812, 822

C. Referenced Information

REFERENCE	DESIGNATION
Location of Units in Avionics Compartment

3. Job Set-up
Subtask 12-21-13-010-051-A

A. Get Access
(1) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the access doors 812 and 822.
(2) Open the access doors 812 and 822.

4. Procedure
Subtask 12-21-13-140-050-A

A. Cleaning of the Grids of the Annunciator-Light Test Unit 70VU

Location of Units in Avionics Compartment

NOTE: In the avionics compartment, use a VACUUM CLEANER and a BRUSH - BRISTLED, SOFT to clean the equipments.
Keep the vacuum cleaner out of the avionics compartment to prevent dust contamination.

(1) Clean the grid on the left side of the 70VU.
(2) Clean the grid on the right side of the 70VU.
(3) Clean the grid at the bottom of the 70VU.

Subtask 12-21-13-140-051-A

B. Cleaning of the Grids of the Relay Box 103VU

Location of Units in Avionics Compartment

NOTE: In the avionics compartment, use a vacuum cleaner and a soft brush to clean the equipments.
Keep the vacuum cleaner out of the avionics compartment to prevent dust contamination.

(1) Clean the left and right external grids of the relay box 103VU.
(2) Open the door of the relay box 103VU.
(3) Clean the left and right internal grids.
(4) Close the door of the relay box 103VU.

Subtask 12-21-13-140-052-A

C. Cleaning of the Grid of the AC/DC Emergency Power-Center 106VU

Location of Units in Avionics Compartment

NOTE: In the avionics compartment, use a vacuum cleaner and a soft brush to clean the equipments.
Keep the vacuum cleaner out of the avionics compartment to prevent dust contamination.

(1) Clean the front face of the 106VU.

Subtask 12-21-13-140-053-A

D. Cleaning of the Grid of the Contactor Box 107VU

Location of Units in Avionics Compartment

NOTE: In the avionics compartment, use a vacuum cleaner and a soft brush to clean the equipments.
Keep the vacuum cleaner out of the avionics compartment to prevent dust contamination.

(1) Clean the front face of the contactor box 107VU.

5. Close-up
Subtask 12-21-13-410-051-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access doors 812 and 822.
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.02 06:10:26 UTC