4. Procedure
_________
 (Ref. Fig. 509/TASK 49-00-00-991-013) Subtask 49-00-00-480-054
 A. Preparation for the Leak Test
 (1) There are two possible procedures to find the location of a pneumatic joint air leak. You can apply dry developer, dry (Material No. CP3010) around the pneumatic joints or you can install foil, aluminium around the pneumatic joint location. Use the steps that follow to apply foil, aluminium to the pneumatic joint locations:
 (a)
 Wind the foil wrap around the joint one time.

 (b)
 Twist the seam of the foil wrap tight as shown.

 (c)
 Make the foil wrap as tight as possible on the tube but do not rip the wrap.

 (d)
 Attach the foil wrap with MISCELLANEOUS (Material No. 19-010) at both sides of the pneumatic joint.

 Subtask 49-00-00-410-071
 B. 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 316AR, 315AL (Ref. TASK 52-41-00-410-001).

 (4)
 Remove the access platform(s).

 (5)
 Remove the warning notice(s). Subtask 49-00-00-865-108

 C.
 Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1KD, 2KD.

 Foil Wrap Installation at Pneumatic System Joints
 Figure 509/TASK 49-00-00-991-013

 CES  Subtask 49-00-00-790-053

 D. Air leak test
 (1)
 Start the APU (Ref. TASK 49-00-00-860-003).

 (2)
 During APU operation:

 -supply bleed air.

 (3)
 Stop the APU (Ref. TASK 49-00-00-860-004).

 (4)
 Put a warning notice in the cockpit to tell persons not to start the APU.

 Subtask 49-00-00-865-110
 E. Open, safety and tag this(these) circuit breaker(s):
 1KD, 2KD

 Subtask 49-00-00-010-068
 F. Get Access
 (1)
 Put the access platform in position below the APU access doors 315AL and 316AR.

 (2)
 Open the APU access doors 315AL and 316AR (Ref. TASK 52-41-00-010-001).

 (3)
 Set the LIGHT control switch 11LJ to the on position. Subtask 49-00-00-080-054

 G.
 Make sure that there no leaks at the joint location, and remove the materials used to check leaks.

 5. Close-up
________ Subtask 49-00-00-410-072
 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 316AR, 315AL (Ref. TASK 52-41-00-410-001).

 (4)
 Remove the access platform(s).

 (5)
 Remove the warning notice(s). Subtask 49-00-00-865-109

 B.
 Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1KD, 2KD.

 Subtask 49-00-00-860-102
 C. Aircraft Maintenance Configuration
 (1) De-energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-862-002).
 Pressurize the aircraft hydraulic systems
 (Ref. TASK 29-14-00-614-002).

 AIRBORNE AUXILIARY POWER - GENERAL ((131-9(A))) - ADJUSTMENT/TEST
_________________________________________________________________ TASK 49-00-00-710-009 Self-Test of the ECB (131-9(A))
 1.
 Reason for the Job

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-42-00-861-001  Energize the Ground Service Network from the External Power 24-42-00-862-001 De-energize the Ground Service Network Supplied from the External Power 31-32-00-860-001 Procedure to Get Access to the SYSTEM REPORT/TEST Menu Page
 3. Job Set-up
__________ Subtask 49-00-00-860-093
 A. Aircraft Maintenance Configuration
 (1)
 Energize the ground service network
 (Ref. TASK 24-42-00-861-001).

 (2)
 On the overhead panel 25VU, push the APU MASTER SW p/bsw (the ON legend comes on).

 (3)
 Do the procedure to get the SYSTEM/REPORT TEST item APU (Ref. TASK 31-32-00-860-001).
　
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