Remove ULB for In Shop Battery Discard

TASK 31-39-33-920-801-A
Remove ULB for In Shop Battery Discard

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 122
ZONE: 312

1. Reason for the Job
Refer to the MPD TASK: 313900-02
REMOVE ULB FOR IN SHOP BATTERY DISCARD.
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	1	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	1	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
122	AVIONICS COMPARTMENT
312	AFT FUSLG TAIL SECTION

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 31-39-00-710-803-A	Operational Check of CVDR ULB
TASK 31-39-33-000-801-A	Removal of the Cockpit Voice and Data Recorder (CVDR) and the Umbrella Panels
TASK 31-39-33-400-801-A	Installation of the Cockpit Voice and Data Recorder (CVDR) and the Umbrella Panels
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
Underwater Locator Beacon (ULB)

3. Job Set-up
Subtask 31-39-33-861-050-A ** ON A/C NOT FOR ALL

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

Subtask 31-39-33-010-050-A ** ON A/C NOT FOR ALL

B. Get Access

Underwater Locator Beacon (ULB) ** ON A/C NOT FOR ALL

(1) Put the WARNING NOTICE(S) in position in the cockpit to tell persons not to operate the flight controls.
(2) Get access to the CVDR2 (1):
(a) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position below access door 811.
(b) Open access door 811 (Ref. AMM TASK 52-41-00-010-002).
(3) Get access to the CVDR1 (2):
(a) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position below access door 312AR.
(b) Open access door 312AR.
(c) Set light switch 3LJ to the ON position.
(d) Remove the CVDR umbrella (Ref. AMM TASK 31-39-33-000-801).

4. Procedure
Subtask 31-39-33-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the ULB

Underwater Locator Beacon (ULB) ** ON A/C NOT FOR ALL

(1) Remove the ULBs (6) from the CVDRs (1) and (2):
(a) Remove the screws (5) from the mounting brackets (4).
(b) Remove the mounting brackets (4) and the nuts (3).
(c) Remove the ULB (6) from the mounting brackets (4).

Subtask 31-39-33-960-050-A ** ON A/C NOT FOR ALL

B. Replacement of the ULB Battery
(1) Send the ULB to the workshop to discard and replace the ULB battery.

Subtask 31-39-33-710-050-A ** ON A/C NOT FOR ALL

C. Test(s)
(1) Do the operational check of the CVDR ULB (Ref. AMM TASK 31-39-00-710-803).

5. Close-up
Subtask 31-39-33-410-050-A ** ON A/C NOT FOR ALL

A. Close Access

Underwater Locator Beacon (ULB) ** ON A/C NOT FOR ALL

(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close access to the CVDR2 (1):
(a) Close access door 811 (Ref. AMM TASK 52-41-00-410-002).
(3) Close access to the CVDR1 (2):
(a) Install the CVDR umbrella (Ref. AMM TASK 31-39-33-400-801).
(b) Set light switch 3LJ to the OFF position.
(c) Close access door 312AR
(4) Remove the WARNING NOTICE(S).
(5) Remove the access platform(s).

Subtask 31-39-33-862-050-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 08:31:59 UTC