(b)  
Write a replacement date on the date label. NOTE: The date label is blank so you can write in a

____ replacement date based on your maintenance schedule.

 (c)  
Make sure that the shock cushion is in the ULB body.

 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 INSERT THIS END in first.

 (e)
Remove and discard the used o-ring from the end cap. CAUTION: DIRT OR OTHER UNWANTED MATERIALS 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.

 (i)  
Put the end cap into the body.

 (j)  
Tighten the end cap until the cap flange touches the ULB body. NOTE: Only use hand force on the spanner wrench.

____
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
737-300/400/500MAINTENANCE MANUAL
 S 702-098
 (2)  Do this task: Underwater Locator Beacon - Test.
 TASK 23-71-21-702-021
 5. Underwater Locator Beacon - Test (Fig. 203)
________________________________
 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. Consumable Materials
 (1)  
A00448 Tape-Adhesive

 (2)  
G01161 Metal braid, (6" in length)

 C. Procedure
 S 722-024
 (1)  If you have a 42A12 Series test set, do this test:
 (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 can hear sounds through the test set

 earphone.

 (c)  
Set the TUNING CONTROL knob to 37 +/- 1 kilohertz.

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

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

 (f)  
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.
____
 1) Make sure you hear sounds through the test set earphone.
 (g)  Use tape to attach a piece of metal braid 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.
 (h)  Make sure that you hear a pulsed tone at 1-second intervals.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

737-300/400/500
MAINTENANCE MANUAL

MICROPHONE
INPUT SELECTOR SWITCH
CONNECTOR FOR EXTERNAL PICKUP
TUNING CONTROL
DUKANE MODEL PL-1 PINGLITE
GAIN CONTROL
SPEAKER
EARPHONES OR OSCILLOSCOPE CONNECTION
DUKANE MODEL 42A12 TEST SET
FINGER REPLACE GOOD
BATTERY
ATS - 260
　
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