(c)  
Push and hold the operation switch on the test set. 1) Make sure the BEACON ACTIVE WHEN FLASHING light flashes. 2) Remove the flexible metal conductor from the ULB case and

 the center of the water switch. 3) Make sure the BEACON ACTIVE WHEN FLASHING light does not flash.

 (d)  
Release the operation switch on the test set.

 (e)  
Remove the test set.

 S 712-068
 (3)  If you have a PL3 test set, do this test of the ULB.
 (a)  
Put the end of the PL3 test set against the ULB water switch. 1) Make sure you hear a tone. 2) Make sure the LED light flashes.

 (b)  
Remove the PL3 test set from the ULB.

 S 712-049
 (4)  If you have an ATS-260 test set, do this test of the ULB:
 (a)  
Put the test set clip on the ULB.

 (b)  
Push and hold the PUSH TO TEST button.

 (c)  
Put the test set probe on the ULB water switch. 1) Make sure a green LED shows. 2) Make sure you can hear sounds from the test set. 3) Make sure the amber LED flashes.

 (d)  
Release the PUSH TO TEST button.

 (e)  
Remove the test set.

 TASK 31-31-02-402-034
 6.  Underwater Locator Beacon Installation (Fig. 201)______________________________________
 A. Consumable Materials
 (1)  B00541 Detergent, General Purpose
 B. References
 (1)  AMM 25-22-02/401, Lowered Ceiling Panels
 C. Access
 (1)  Location Zones 253 Area Above Passenger Compartment Ceiling, Left - Section 46 254 Area Above Passenger Compartment Ceiling, Right - Section 46
 D. Installation Procedure
 S 422-032
 (1)  Install the underwater locator beacon on the flight data recorder:
 (a)  
Make sure the water switch end of the ULB has no grease or dirt. 1) Clean the water switch on the ULB with a weak detergent.

 (b)  
Put the ULB into its bracket.

 (c)  
Install the clamp on the end of the ULB with the two screws.

 (d)  
Make sure you can read the replacement date on the ULB.

 (e)  
Tighten the four screws.

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 S 412-028
 (2)  Close the ceiling panel (AMM 25-22-02/401) in the aft passenger compartment.
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 FLIGHT DATA ACQUISITION UNIT (FDAU) - MAINTENANCE PRACTICES
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