23-71-03
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 S 712-071
 (2)  Do this task: Underwater Locator Beacon - Test.
 TASK 23-71-03-702-034
 5.  Underwater Locator Beacon - Operational Test____________________________________________
 A.  Equipment
 (1)  
42A12 Series 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 712-035
 (1) If you have a 42A12 Series test set, do this test of the ULB:
 (a)  
Put the ultrasonic test set approximately 3 feet from the ULB.

 (b)  
Set the ON-OFF-GAIN control 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 to 37.5 |1 kHz.

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

 (e)  
Make sure that the test set operates correctly.

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

 23-71-03
 ALL  ú ú 02 Page 210 ú May 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 (f)  Use tape to attach a piece of wire or other 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 piece of wire or other conductive material from the ULB case and the center of the water switch. 1) Make sure that you do not hear a pulsed tone.

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

 (i)  
Make sure that the water switch on the ULB has no grease or dirt. 1) If necessary, clean the switch with water and detergent. 2) Dry the switch with a clean cloth.

 S 712-036
 (2)  If you have a PL1 test set, do this test of the ULB:
 (a)  Use tape to attach a piece of wire or other 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 piece of wire or other conductive material from

 the ULB case and center of the water switch. 3) Make sure that the BEACON ACTIVE WHEN FLASHING light does not come on and off.

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

 (e)  
Remove the test set.

 (f)  
Make sure that the water switch on the ULB has no grease or dirt. 1) If necessary, clean the switch with water and detergent.

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