Installation of the Low-Frequency Underwater Locator Beacon (ULB)

TASK 25-65-36-400-801-A
Installation 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
FIN: 200MX ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BBD1)	Non Aqueous Cleaner-- Isopropyl Alcohol -

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
150	AFT CARGO COMPARTMENT FWD PRESS BULKHEAD TO AFT BULKHEAD OF AFT CARGO COMPARTMENT
152HW

C. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
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 25-65-00-710-802-A	Operational Check of the Low-Frequency Underwater Locator Beacon (ULB)
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
Underwater Locator Beacon

3. Job Set-up
Subtask 25-65-36-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
(2) Make sure that the aft cargo-compartment door is opened (Ref. AMM TASK 52-30-00-860-001).
(3) Make sure that the light switch is set to the ON position.
(4) Make sure that sidewall panel 152HW is removed (Ref. AMM TASK 25-55-11-000-003).

4. Procedure
Subtask 25-65-36-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Underwater Locator Beacon

Underwater Locator Beacon ** ON A/C NOT FOR ALL

(1) Put the underwater locator beacon (1) in position and install the washers (3) and the screws (2).
(2) Make sure that the sensors (4) point to the forward direction.
(3) Make sure that the sensors (4) and the insulation around them are clean and free of grease and dirt.
If necessary, clean the sensors (4) with Non Aqueous Cleaner-- Isopropyl Alcohol - (Material No.08BBD1) .
(4) Install the washer (5) and the screw (6) (Ref. AMM TASK 20-28-00-912-802).
(5) Tighten the screws (6) and (2).

Subtask 25-65-36-710-050-A ** ON A/C NOT FOR ALL

B. Operational Test
(1) Do the operational test of the underwater locator beacon (Ref. AMM TASK 25-65-00-710-802).

5. Close-up
Subtask 25-65-36-410-050-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 (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 25-65-36-862-050-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] 2026.04.01 06:34:23 UTC