Operational Check of the Low-Frequency Underwater Locator Beacon (ULB)

TASK 25-65-00-710-802-A
Operational Check of the Low-Frequency Underwater Locator Beacon (ULB)

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

ZONE: 150
ZONE: 160
FIN: 200MX ** ON A/C NOT FOR ALL

1. Reason for the Job
Refer to the MPD TASK: 256536-01
OPERATIONAL CHECK OF LOW FREQUENCY UNDERWATER LOCATOR BEACON.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
20538-00	1	KIT-TEST, LF ULB

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BBD1)	Non Aqueous Cleaner-- Isopropyl Alcohol -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
150	AFT CARGO COMPARTMENT FWD PRESS BULKHEAD TO AFT BULKHEAD OF AFT CARGO COMPARTMENT
160	BULK CARGO COMPARTMENT AFT BULKHEAD OF AFT CARGO COMPARTMENT TO AFT BULKHEAD OF BULK CARGO COMPARTMENT
152GW, 152HW

D. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 25-55-11-000-003-A	Removal of the Sidewall Panels in the Aft Cargo Compartment - FR47/FR59
TASK 25-55-11-400-003-A	Installation of the Sidewall Panels in the Aft Cargo Compartment - FR47/FR59
TASK 25-65-00-920-803-A	Removal of the Low-Frequency Underwater Locator Beacon (ULB) for In Shop Discard of Battery (200MX)
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-30-00-860-002-A	Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 25-65-00-00	MISCELLANEOUS EMERGENCY EQUIPMENT - DESCRIPTION AND OPERATION
Underwater Locator Beacon (ULB) - Test Tool

3. Job Set-up
Subtask 25-65-00-861-063-A ** ON A/C NOT FOR ALL

A. Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).

Subtask 25-65-00-010-067-A ** ON A/C NOT FOR ALL

B. Get Access
(1) For the location of this component, refer to paragraph Component Location
(Ref. AMM D/O 25-65-00-00).
(2) Open the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-001).
(3) Set the light switch to on.
(4) Remove sidewall panel 152HW or 152GW (Ref. AMM TASK 25-55-11-000-003).

4. Procedure
Subtask 25-65-00-560-050-A ** ON A/C NOT FOR ALL

A. Cleaning of the Underwater Locator Beacon (ULB)
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the two water switch buttons and the insulation around them are clean and have no grease on them. If necessary, clean them with Non Aqueous Cleaner-- Isopropyl Alcohol - (Material No.08BBD1) and a Textile-Lint free Cotton - (Material No.14SBA1) .

Subtask 25-65-00-710-051-A ** ON A/C NOT FOR ALL

B. Operational Test
(1) Do the operational test with the ultrasonic test set:

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

ACTION	RESULT
1.On the 20538-00 KIT-TEST, LF ULB (2): Push the power pushbutton.	On the 20538-00 KIT-TEST, LF ULB (2): The screen comes on and shows the brand name.
2.On the screen of the 20538-00 KIT-TEST, LF ULB (2): If a low battery indication comes into view, replace the battery of the 20538-00 KIT-TEST, LF ULB (2).
3.On the 20538-00 KIT-TEST, LF ULB (2): Connect the activation cord (3) to the USB slot of the 20538-00 KIT-TEST, LF ULB (2).
4.On the screen of the 20538-00 KIT-TEST, LF ULB (2): On the start menu, touch the measurement icon.	On the screen of the 20538-00 KIT-TEST, LF ULB (2): The connecting page comes into view.
5.On the ULB (1): Connect the plug of the activation cord (3) to the correct poles of the ULB (1) and hold the plug. Hold the 20538-00 KIT-TEST, LF ULB (2) near the underwater locator beacon (1). NOTE: This prevents loss of the acoustic signal.	On the screen of the 20538-00 KIT-TEST, LF ULB (2): The progress bar comes into view. After 3 seconds, you hear an acoustic signal. A "SIGNAL OK" tick mark comes into view in the checkbox. NOTE: This "SIGNAL OK" tick mark shows that the functional test is completed and the transmission frequency of the ULB is correct.
6.Do a check of the battery voltage.	Make sure that the battery voltage is not less than 3.2 VDC. If the battery voltage is less than 3.2 VDC, replace the battery (Ref. AMM TASK 25-65-00-920-803).
7.On the screen of the 20538-00 KIT-TEST, LF ULB (2): Touch the screen to go back to the start menu page. On the start menu page, touch the memory icon.	On the screen of the 20538-00 KIT-TEST, LF ULB (2): The start menu page comes into view, then the memory page. The memory page shows the battery voltage.
8.On the screen of the 20538-00 KIT-TEST, LF ULB (2): Touch the screen to go back to the start menu page.	On the screen of the 20538-00 KIT-TEST, LF ULB (2): The start menu page comes into view.
9.On the 20538-00 KIT-TEST, LF ULB (2): Push the power pushbutton.	On the 20538-00 KIT-TEST, LF ULB (2): The screen goes off.

Subtask 25-65-00-560-051-A ** ON A/C NOT FOR ALL

C. Inspection of the Attachments of the ULB
(1) Do a visual inspection of the attachment screws and the bracket.
(2) Make sure that the attachment screws and the bracket are clean and new and that they show no signs of contamination and deterioration.

5. Close-up
Subtask 25-65-00-410-067-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install sidewall panel 152HW or 152GW (Ref. AMM TASK 25-55-11-400-003).
(3) Set the light switch to off.
(4) Close the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-002).

Subtask 25-65-00-862-063-A ** ON A/C NOT FOR ALL

B. De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

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