3. Job Set-up
__________
Subtask 26-13-15-860-050
A. Aircraft Maintenance Configuration
(1)
Make sure that the warning notice is in position on the panel 25VU to tell persons not to start the APU.
(2)
Energize the ground service network
(Ref. TASK 24-42-00-861-001).
(3)
Make sure that hydraulic systems are depressurized
(Ref. TASK 29-00-00-864-001).
(4)
Make sure that the access platform is in position below the APU compartment.
(5)
Make sure that the maintenance door 314AR is open
(6)
Make sure that the APU access doos 315AL, 316AR are open (Ref. TASK 52-41-00-010-001).
(7)
Make sure that the LIGHT control switch 11LJ is set to the ON position.
Subtask 26-13-15-865-051
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/FIRE AND OVHT/DET/LOOP B 2WG L44 121VU APU/FIRE AND OVHT/DET/LOOP A 1WG L43 121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41
R 121VU APU/FIRE/EXTIG/SQUIB/B 2WF L39
R 121VU APU/FIRE/EXTIG/SQUIB/A 1WF L38 121VU APU/FIRE/LP VALVE/NORM 4WF M42 121VU APU/FIRE/LP VALVE/STBY 3WF M41
4. Procedure
_________
(Ref. Fig. 401/TASK 26-13-15-991-001, 402/TASK 26-13-15-991-002) Subtask 26-13-15-210-050
A. Preparation for Installation
(1) Clean the component interface and/or the adjacent area.
(2) Do an inspection of the component interface and/or the adjacent area. Subtask 26-13-15-420-050
B. Installation of the APU Fire Sensing Elements NOTE : The installation procedure is the same for the APU fire sensing
____
elements 21WG and 22WG.
(1)
Put the sensing elements in position. NOTE : Obey the tolerances and length compensation limits.
____
(Ref. Fig. 402/TASK 26-13-15-991-002)
(2)
Install the support bushes (1) in the dual clamps (3) with the split up when horizontal and rearwards when vertical.
(3)
Close the dual clamps (3) and turn the screws (2) until the red marks on the screws and on the clamps are aligned.
(4)
Remove the blanking caps from the electrical connectors.
(5)
Make sure that the electrical connectors are clean and in the correct condition.
(6)
Install the new 0-rings (7) (7) on the pins in the responder housings.
(7)
Connect the fire/overheat detector 21WG(22WG) (6) on the mounting plate (8).
(8)
Install the srews (4) and the washers (5).
(9)
Connect the electrical connector 21WG(22WG)-A (9).
1EFF : ALL 1 26-13-15Page 408 1 1 May 01/98R 1 1 1CES 1
R Subtask 26-13-15-865-054
R R C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1WF, 2WF, 3WF, 4WF, 1WG, 2WG, 1KD, 2KD.
Subtask 26-13-15-710-051
R D. Operational Test of the APU Fire and Overheat Detection with the CFDS
(1) On one Multipurpose Control and Display Unit (MCDU), get the SYSTEM REPORT/TEST/FIRE PROT page (Ref. TASK 31-32-00-860-005).
(2) Do this test:
-------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. On the MCDU: On the MCDU:
- push the line key adjacent to the FDU APU indication. - the FDU APU page comes into view.
- push the line key adjacent to the TEST indication. On the FDU APU page:- the TEST WAIT message comes into view for 60 seconds then goes out of view, and these messages come into view (P/N given for example only):
TEST OK P/N 7304 01 02 END OF TEST
NOTE : Ignore other indications.____
5. Close-up
________
R
Subtask 26-13-15-410-052
R A. Close Access
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Set the LIGHT control switch 11LJ to the OFF position.
(3) Close the APU access doors 315AL, 316AR (Ref. TASK 52-41-00-410-001).
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