R horizontal position. To adjust the accelerometer in the
R correct position, remove or add washers from or to the
R accelerometer fitting.
R **ON A/C 001-049, 051-099, 101-149, 151-199, 203-299, 301-399, 401-499,
R 5. Close-up________
R Subtask 31-33-00-862-065
R A. Put the aircraft back to its initial configuration.
R (1) De-energize the aircraft electrical circuits
R (Ref. TASK 24-41-00-862-002).
R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 31-33-00Page 534 1203-299, 301-399, 401-499, 1Aug 01/05 1 1 1CES 1
R **ON A/C ALL
TASK 31-33-00-710-015
Operational Test of the DFDR Underwater Locator Beacon (ULB)
1. Reason for the Job
__________________
Refer to the MPD TASK: 313300-03
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
-------------------------------------------------------------------------------
No specific electrcal lead
No specific stopwatch
42A12C 1 ULTRASONIC TEST SET
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
-------------------------------------------------------------------------------
R 31-33-55-920-001 Replacement of the Underwater Locator Beacon (ULB) R and Battery
1EFF : ALL 1 31-33-00Page 535 1 1 Aug 01/05 1 1 1CES 1
3. Job Set-up
__________ Subtask 31-33-00-010-061
A. Get Access
(1) Put the access platform in position at zone 312.
(2)
Open the access panel 312AR. Subtask 31-33-00-860-058
B.
Aircraft Maintenance Configuration. NOTE : For this procedure you can use ULTRASONICSONIC TEST SETs with the
____
P/N 42A12().
(1)
On the Underwater Location Beacon (ULB), look at the date on the battery replacement label. If the date has expired, replace the battery (Ref. TASK 31-33-55-920-001).
(2)
If you use 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.
(3)
If you use a ULTRASONIC TEST SET (42A12D):
-
set the Tuning Potentiometer to between 35Khz and 40Khz
-
set the Gain Potentiometer to the maximum position.
(4)
With an electrcal lead make a short circuit between the water switch of the ULB and the body of the battery.
(5)
Put the microphone of the test receiver as near as possible to the ULB. Tune the test receiver to get the best signal.
1EFF : ALL 1 31-33-00Page 536 1 1 Aug 01/05 1 1 1CES 1
4. Procedure
_________
Subtask 31-33-00-710-078
A. Operational Test of the Underwater Location Beacon (ULB)
-------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1.
With a stopwatch, count the number of pulses from the ULB during a cycle of 10 seconds.
2.
Calculate the pulse rate: The pulse rate must be approximately
-divide the number of pulses one pulse per second.
during the cycle by the number
of seconds (10 seconds).
3.
You can measure the pulse duration with an oscilloscope connected to the output of the test receiver.
4.
You can measure the transmission On the test receiver: frequency of the ULB with the - read the frequency at the TUNING test receiver tuned to this potentiometer. frequency.
NOTE : The ULB is not in the water. Following functions are different:
____
-
the pulse duration will be longer
-
the pulse rate will be slower
than in the test by the manufacturer (in water).
If the pulse rate increases or is much faster, you must replace
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