CAUTION:_______INSTALL THE ULB BATTERY CORRECTLY. INCORRECT POLARITY WILL CAUSE PERMANENT DAMAGE TO THE ULB.

 (d)  
Put the new battery in the ULB with the end identified by INSERT THIS END in first.

 (e)  
Remove and discard the used O-ring from the end cap.

 CAUTION: DIRT OR OTHER UNWANTED MATERIAL CAN CAUSE DAMAGE TO THE
_______ THREADS AND THE O-RING SEAL. THIS CAN PERMIT WATER LEAKAGE.
 (f)  
Clean the threads and the O-ring groove in the ULB body.

 (g)  
Install a new lubricated O-ring on the end cap.

 (h)  
Put the rubber shock cushion smoothly on the end cap.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400 MAINTENANCE MANUAL
 (i)  Put the end cap into the body.
 1)  Tighten the end cap until the cap flange touches the ULB body.
 NOTE: Only use hand force on the spanner wrench.
____
 TASK 31-31-09-702-020
 5.  Underwater Locator Beacon - Operational Test____________________________________________
 A.  Equipment
 (1)  
42A12 Ultrasonic Test Set (alternative)
 Dukane Corporation
 2900 Dukane Drive
 St. Charles, IL 60174

 (2)  
PL1 Ultrasonic Test Set (alternative)
 Dukane Corporation
 2900 Dukane Drive
 St. Charles, IL 60174

 (3)  
PL3 Ultrasonic Test Set (alternative)
 Dukane Corporation
 2900 Dukane Drive
 St. Charles, IL 60174

 (4)  
ATS-260 Acoustic Test Set (alternative)
 Datasonics, INC.
 1400 Route 28A
 Cataumet, MA 02534

 B.  Procedure
 S 722-044
 (1)  If you have a 42A12 test set, do this test of the ULB:
 (a)  
Put the test set approximately 3 feet from the ULB.

 (b)  
Set the OFF-GAIN control switch on the test set to the middle position. 1) Make sure that you hear sounds through the earphone on the

 test set.

 (c)  
Set the TUNING CONTROL knob to 37 kHz.

 (d)  
Set the INPUT SELECTOR switch to the INT position.

 (e)  
Make sure the test set operates correctly:

 1)  Shake a set of keys or some coins in front of the microphone to make sure it operates.
 NOTE: This will supply ultrasonic noise.
____
 a)  Make sure you hear sounds through the test set earphone.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 07 Page 207 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (f)  Use a piece of tape to attach a piece of wire or conductive material to the ULB case and the center of the water switch.
 NOTE: This will make a short circuit from the center of the
____ water switch to the outer part of the ULB.
 1) Make sure you hear a pulsed tone at 1-second intervals.
 (g)  
Remove the wire or conductive material from the ULB case and center of the water switch. 1) Make sure you do not hear a pulsed tone.

 (h)  
Set the OFF-GAIN control switch to the OFF position.

 S 722-043
 (2)  If you have a PL1 test set, do this test of the ULB:
 (a)  Use a piece of tape to attach a wire or conductive material to the ULB case and the center of the water switch.
 NOTE: This will make a short circuit from the center of
____ the water switch to the outer part of the ULB.
 (b)  
Put the end of the test set against the ULB, approximately one inch from the water switch.

 (c)  
Push and hold the operation switch on the test set. 1) Make sure the BEACON ACTIVE WHEN FLASHING light flashes. 2) Remove the wire or conductive material from the ULB case
　
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