(2)
De-energize the aircraft electrical circuits
(Ref. TASK 24-41-00-862-002).
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TASK 23-71-00-720-001
Operational Test of the Underwater Locating Beacon (ULB)
CAUTION : DO NOT PUT MARKINGS OR LABELS ON THE ULB (ONLY THE BATTERY
_______ REPLACEMENT LABEL IS PERMITTED). THEY CAN DECREASE THE PROPAGATION.
NOTE : This procedure is applicable on the CVR and the SSCVR.
____
1. Reason for the Job
__________________
Refer to the MPD TASK: 237135-02
Operational check of the ULB.
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific stopwatch
No specific access platform 2.8 m (9 ft. 2 in.)
42A12C 1 ULTRASONIC TEST SET
R 42A12D 1 ULTRASONIC TEST SET
B. Consumable Materials
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. 11-005
TRICHLOROTRIFLUORO ETHANE (Ref. 20-31-00)
C. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
23-71-35-920-001 Scheduled Replacement of the Underwater Locating Beacon (ULB) and Battery
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3. Job Set-up__________
Subtask 23-71-00-860-054
A. Aircraft Maintenance Configuration
(1) Put the access platform in position at the zone 312.
(2) Open the access door 312AR.
(3) On the ULB, look at the date on the battery replacement label. If the date is expired, replace the battery (Ref. TASK 23-71-35-920-001).
(4) On the
R (a) ULTRASONIC TEST SET (42A12C): - Set the INPUT switch to INT. - Set the TUNING potentiometer to between 35KHz and 40KHz. - Set the GAIN potentiometer to the maximum position.
R R R (b) ULTRASONIC TEST SET (42A12D): - Set the TUNING potentiometer to between 35KHz and 40KHz. - Set the GAIN potentiometer to the maximum position.
(5) Make a short circuit between the water switch of the ULB and the body of the battery.
NOTE : Use an electric lead.____
(6) Put the microphone of the test receiver as near as possible to the ULB. Tune the test receiver to get the best signal.
4. Procedure_________
Subtask 23-71-00-720-051
A. Do the functional test:
-------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. With a stopwatch, count the number of pulses from the ULB during a cycle of 10 seconds. Calculate the pulse rate:
- Divide the number of pulses during the cycle by the number of seconds (10 seconds). - The pulse rate must be approximatelyone pulse per second.
-------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
2. You can measure the pulse time
with an oscilloscope connected to
the output of the test receiver.
R
NOTE : For this test in air:
____
-
The pulse time is longer,
-
The pulse rate is slower, than in the test in water (manufacturer test). But if the pulse rate increases or is much faster, you must replace the battery. If the ULB does not operate correctly after, you must replace the ULB.
5. Close-up
________
Subtask 23-71-00-860-055
A. Put the aircraft back to its initial configuration.
(1)
On the test receiver:
