Installation of the Environmental Control System (ECS) Mid-Y Duct and the Intermediate Pressure Check Valve (IPCV)

A. Installation of the ECS Mid-Y Duct and the IPCV
   (1) If you use the APU to energize the electrical circuits, stop the APU:

• For GTCP 36-300 APU (Ref. AMM D/O 49-00-00-86)
  
• For APS 3200 APU (Ref. AMM D/O 49-00-00-86)
  
• For 131-9(A) APU (Ref. AMM TASK 49-00-00-860-009).
  

   (2) In the cockpit, on the SD bleed page:
     (a) Make sure that the pressure and the temperature of the bleed-air duct system are in ambient conditions.
   (3) Install the IPCV (14) and the mid-Y duct (11) as follows:
     (a) Remove the COVER - PROTECTION from:

• The Pressure Regulating Valve (PRV)
  
• The High Pressure Valve (HPV)
  
• The LP duct
  
• The mid-Y duct (11)
  
• The IPCV (14)
  
• The PRV muscle sense-tube (4)
  
• The HPV muscle sense-tube (3)
  
• The pylon HPV sense-tube (1).
  

     (b) Install a new AIPC 36-11-86-20-270 SEAL (13) on the IPCV (14).
     (c) Install the IPCV (14) on the mid-Y duct (11):
       1 Make sure that the new seal (13) is between the IPCV (14) and the mid-Y duct (11).
       2 Make sure that the visualization tab on the IPCV (14) is in the position.
     (d) Install the new AIPC 36-11-86-20-270 SEAL (13) in the mid-Y duct (11) and the IPCV (14).
     (e) Move the LP duct and the starter duct a small distance to get clearance. Put the mid-Y duct (11) and the IPCV (14) in position between the LP duct, the PRV and the HPV.

CAUTION: APPLY THE ANTI-SEIZE COMPOUND TO ALL THE THREADS OF THE SENSE TUBE FITTING AND TO ALL THE THREADS OF THE MATING FITTING. MAKE SURE THAT THE ANTI-SEIZE COMPOUND DOES NOT GO INTO THE SENSE LINES. IF YOU DO NOT OBEY THESE INSTRUCTIONS, YOU CAN CAUSE INCORRECT OPERATION OF THE ECS.

     (f) Apply anti-seize compound (Material No.PU5-0005) or Royco 81 MS Anti-Seize Compound (Material No.PU5-0005A) or PT 605 Anti-Seize Compound (Material No.PU5-0005B) to the threads of the fittings of the pylon HPV sense-tube (1), PRV muscle sense-tube (4), HPV muscle sense-tube (3) and mid-Y duct (11) (Ref. AMM TASK 36-11-49-400-823).
     (g) Loosely connect the pylon HPV sense-tube (1) to the mid-Y duct (11). Do not torque the tube fitting at this time.
     (h) Loosely connect the HPV muscle sense-tube (3) to the mid-Y duct (11). Do not torque the tube fitting at this time.
     (i) Loosely connect the PRV muscle sense-tube (4) to the starter duct. Do not torque the tube fitting at this time.
     (j) Install the V-band couplings (12) on the mid-Y duct (11), IPCV (14), LP duct, PRV and HPV as follows:
       1 Put the V-band couplings (12) latch adjacent to the latch arrows on the LP duct and the mid-Y duct (11). Do not torque the V-band couplings (12) at this time.
       2 Make sure that the hinge of the V-band coupling (12) is above the visualization tab of the IPCV (14).
     (k) Install the V-band coupling (2) that attaches the LP duct to the engine. Do not torque the V-band coupling (2) at this time.
     (l) Adjust the mid-Y duct (11), the IPCV (14) and the LP duct to remove the load on the ECS:
       1 Make sure the V-band couplings (12) are in the correct position to get the maximum clearance.
     (m) Adjust the sense lines to remove the load on the ECS.
     (n) Attach all the link assemblies to the starter duct as follows:
       1 If necessary, cut the safety cable on the link assemblies.
       2 Adjust all the link assemblies as necessary to remove the load on the starter duct. Do not torque the nuts on the link assemblies at this time.
       3 Apply anti-seize compound (Material No.PU5-0005) or Royco 81 MS Anti-Seize Compound (Material No.PU5-0005A) or PT 605 Anti-Seize Compound (Material No.PU5-0005B) to the threads of the nuts (8).
       4 Attach the link assemblies to the starter duct with the bolts (5), washers (6), bushings (7) and nuts (8).
       5 TORQUE the nuts (8) to between 70 and 55 lbf.in (0.79 and 0.62 m.daN ) .
       6 If you adjusted the link assemblies during removal or installation, tighten the link assemblies as follows:
         a TORQUE the nuts on the link assemblies to between 175 and 155 lbf.in (1.98 and 1.75 m.daN ) .

WARNING: USE GOGGLES WHEN YOU REMOVE OR INSTALL SAFETY CABLE. EACH TIME YOU CUT SAFETY CABLE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE SAFETY CABLE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

         b Use a PU1-0002Cable,Safety or safety cable (Material No.PU1-0027) to safety the nuts on the link assemblies.
     (o) Torque the fittings on the pylon HPV sense-tube (1), the HPV muscle sense-tube (3) and the PRV muscle sense-tube (4) (Ref. AMM TASK 36-11-49-400-823).
     (p) Tighten the V-band coupling (2) that attaches the LP duct to the engine. Make sure the V-band coupling (2) is in the correct position (Ref. AMM TASK 36-11-49-400-822).
     (q) Tighten the V-band couplings (12) as follows:
       1 TORQUE the V-band couplings (12) to between 125 and 115 lbf.in (1.41 and 1.30 m.daN ) .
       2 Tap around the outer surface of the V-band couplings (12) with a HAMMER - FIBER.
       3 TORQUE the V-band couplings (12) again to between 125 and 115 lbf.in (1.41 and 1.30 m.daN ) .
       4 Tap around the outer surface of the V-band couplings (12) again with the HAMMER - FIBER.
       5 TORQUE the V-band couplings (12) a third time to between 125 and 115 lbf.in (1.41 and 1.30 m.daN ) .
       6 Tap around the outer surface of the V-band couplings (12) again with the HAMMER - FIBER.
       7 TORQUE the V-band couplings (12) to between 125 and 115 lbf.in (1.41 and 1.30 m.daN ) .
       8 Make sure that two full threads are shown on the V-band couplings (12).
     (r) Attach the ECS electrical harness and the clamps to the mid-Y duct (11) with the bolts (10) and the washers (9).
     (s) TORQUE the bolts (10) to between 35 and 31.5 lbf.in (0.40 and 0.36 m.daN ) .
   (4) Make sure that the mid-Y duct (11) and the IPCV (14) are correctly installed as follows:
     (a) Make sure that the mid-Y duct (11), IPCV (14), PRV muscle sense-tube (4), HPV muscle sense-tube (3) and pylon HPV sense-tube (1) are not damaged.
     (b) Make sure that the V-band couplings (12) are in the correct position and correctly engages and aligns with:

• The PRV
  
• The HPV
  
• The IPCV (14)
  
• The mid-Y duct (11).
  

     (c) Make sure that the PRV, HPV, IPCV (14) and mid-Y duct (11) are correctly aligned.
     (d) Make sure that the V-band coupling (2) is in the correct position and is correctly aligned.

C. Test(s)
   (1) Do the test No. 1 - Pneumatic Leak Test (Ref. AMM TASK 71-00-00-790-802).