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 (1) Make sure that the PTU isolation coupling is disconnected (Ref. TASK 29-23-00-860-001).
 (2) Make sure that the aircraft electrical circuits are de-energized (Ref. TASK 24-41-00-862-002)
 (3) Make sure that the flight configuration precautions were obeyed (Ref. TASK 32-00-00-860-001).

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 (4)
 Make sure that the Green hydraulic system is depressurized (Ref. TASK 29-10-00-864-001).

 (5)
 Make sure that the reservoir of the Green hydraulic system is depressurized (Ref. TASK 29-14-00-614-001).

 Subtask 32-31-17-865-052
 B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU L/G/LGCIU/SYS1/NORM 1GA C09 121VU HYDRAULIC/LGCIU/SYS2 2GA Q35 121VU HYDRAULIC/LGCIU/SYS1/GRND SPLY 52GA Q34 121VU HYDRAULIC/G HYD/PUMP ENG1/CTL 1701GK R35 121VU HYDRAULIC/G HYD/PUMP ENG1/MONG 1702GK R34
 Subtask 32-31-17-860-052
 C. Make sure that the warning notices are in position to tell persons not to pressurize the Green hydraulic system: - on the panel 40VU in the cockpit, - on the ground service panel of the Green hydraulic system.
 Subtask 32-31-17-560-050-A
 D. 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.

 (3)
 Make sure that the parts retained from the removed component are clean and in the correct condition.

 (4)
 Obey the hydraulic safety procedures (Ref. TASK 29-00-00-910-002).

 (a) Apply HYDRAULIC FLUIDS (Material No. 02-003), HYDRAULIC FLUIDS (Material No. 02-003A), HYDRAULIC FLUIDS (Material No. 02-003B), HYDRAULIC FLUIDS (Material No. 02-003C) or HYDRAULIC FLUIDS (Material No. 02-003D) to the new packings (2).
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 (b)
 Apply HYDRAULIC FLUIDS (Material No. 02-003), HYDRAULIC FLUIDS (Material No. 02-003A), HYDRAULIC FLUIDS (Material No. 02-003B), HYDRAULIC FLUIDS (Material No. 02-003C) or HYDRAULIC FLUIDS (Material No. 02-003D) and the new packing (16).

 (c)
 Apply HYDRAULIC FLUIDS (Material No. 02-003), HYDRAULIC FLUIDS (Material No. 02-003A), HYDRAULIC FLUIDS (Material No. 02-003B), HYDRAULIC FLUIDS (Material No. 02-003C) or HYDRAULIC FLUIDS (Material No. 02-003D) to the new back-up rings (3).

 (d)
 Apply HYDRAULIC FLUIDS (Material No. 02-003), HYDRAULIC FLUIDS (Material No. 02-003A), HYDRAULIC FLUIDS (Material No. 02-003B), HYDRAULIC FLUIDS (Material No. 02-003C) or HYDRAULIC FLUIDS (Material No. 02-003D) to the new back-up ring (15).

 (5)
 If removed apply HYDRAULIC FLUIDS (Material No. 02-003), HYDRAULIC FLUIDS (Material No. 02-003A), HYDRAULIC FLUIDS (Material No. 02-003B), HYDRAULIC FLUIDS (Material No. 02-003C) or HYDRAULIC FLUIDS (Material No. 02-003D) to the new square seals (6).

 (a)
 Apply HYDRAULIC FLUIDS (Material No. 02-003), HYDRAULIC FLUIDS (Material No. 02-003A), HYDRAULIC FLUIDS (Material No. 02-003B), HYDRAULIC FLUIDS (Material No. 02-003C) or HYDRAULIC FLUIDS (Material No. 02-003D) to the new square seal (12).

 (b)
 Apply HYDRAULIC FLUIDS (Material No. 02-003), HYDRAULIC FLUIDS (Material No. 02-003A), HYDRAULIC FLUIDS (Material No. 02-003B), HYDRAULIC FLUIDS (Material No. 02-003C) or HYDRAULIC FLUIDS (Material No. 02-003D) to the new back-up rings (5).

 (c)
 Applly HYDRAULIC FLUIDS (Material No. 02-003), HYDRAULIC FLUIDS (Material No. 02-003A), HYDRAULIC FLUIDS (Material No. 02-003B), HYDRAULIC FLUIDS (Material No. 02-003C) or HYDRAULIC FLUIDS (Material No. 02-003D) to the new back-up ring (13).

 

 (6)
 Install the back-up rings (5) and (13) on the bobbins (4) and (14), install the square seals (6) and (12) on the bobbings (4) and (14) and install the bobbins (Ref. TASK 20-23-21-911-001).

 4. Procedure
_________
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 (Ref. Fig. 401/TASK 32-31-17-991-001-A)
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R (Ref. Fig. 401A/TASK 32-31-17-991-001) R **ON A/C ALL
 Subtask 32-31-17-420-050-A
 A. Installation of the Safety Valve (7)
 (1)
 Remove the blanking plugs.

 (2)
 Install the new back-up rings (3) and (15) on the bobbins (4) and (14).

 (3)
 Install the new packings (2) and (16) on the bobbins (4) and (14) (Ref. TASK 20-23-21-911-001).
　
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