3. Job Set-up
__________
Subtask 26-15-00-861-050
A. Energization
CAUTION : USE ONLY THE GROUND SERVICE NETWORK TO SUPPLY ELECTRICITY
_______ BECAUSE THE AVIONICS VENTILATION SYSTEM IS NOT SERVICEABLE. IF YOU ENERGIZE THE AIRCRAFT ELECTRICAL CIRCUITS WITHOUT THE VENTILATION SYSTEM YOU WILL CAUSE DAMAGE TO ELECTRICAL EQUIPMENT.
(1) Energize the ground service network (Ref. TASK 24-42-00-861-001). Subtask 26-15-00-865-050
B. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU AIR COND/AVNCS VENT/CTL 6HQ D06 49VU AIR COND/AVNCS VENT/CTL 5HQ D05
Subtask 26-15-00-010-050
C. Get Access
(1) Put the access platform in position at the access door 824.
(2) Open the access door 824. Subtask 26-15-00-480-050
D. Connection of the Tooling
(1)
Disconnect the electrical connector 1WA-A from the smoke detector 1WA.
(2)
Connect the electrical connector of the TEST SET-SMOKE DETECTOR (35M5M01130000) to the connector of the smoke detector 1WA ; the voltage of the electrical power supply is 28V, supplied by the test set.
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4. Procedure
_________
Subtask 26-15-00-720-050
A. Functional Test of Smoke Detector Sensitivity
-------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. On the test set : On the test set :
- Set the ammeter sensitivity
switch to 400 mA.
- Set the SELECTOR switch to 28V
- Set the A.L switch to ON
- Read the stable voltage U1. - U1 is between 2V and 4V.
- Push the TEST 28V pushbutton
switch
- When the value is stable, read - U2 is between 8V and 10V.
the voltage U2.
The detector sensitivity is :
- Delta U = U2-U1 = 6V (plus or minus
1V).
- If the smoke detector sensitivity is
out of tolerance (sensitivity less
than 5V or more than 7V) the smoke
detector is dirty. You must remove it
(Ref. TASK 26-15-15-000-001) and
(Ref. TASK 26-15-15-400-001).
5. Close-up________
Subtask 26-15-00-080-050
A. Disconnection of the Tooling
(1)
Disconnect the electrical connector from the test set.
(2)
Connect the electrical connector 1WA-A to the smoke detector 1WA.
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Subtask 26-15-00-865-051
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 5HQ, 6HQ
Subtask 26-15-00-710-051
C. Do the operational test of the avionics smoke detection system from the Multipurpose Control and Display Unit (MCDU) (Ref. TASK 26-15-00-710-001).
Subtask 26-15-00-410-050
D. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Close the access door 824 (Ref. TASK 52-41-00-410-002).
(3) Remove the access platform(s). Subtask 26-15-00-862-050
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