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 (2)
 Remove, overhaul or replace, and install the pack flow-control valves 8HB and 11HB (Ref. TASK 21-51-51-000-001), (Ref. TASK 21-51-51-400-001) and (Ref. CMM 215110).

 (3)
 Remove, overhaul or replace, and install the the aft-cargo trim-air valve 12HC (Ref. TASK 21-43-51-000-001), (Ref. TASK 21-43-51-400-001) and (Ref. CMM 214302).

 (4)
 Remove, overhaul or replace, and install the pressure regulating valve 11HC (Ref. TASK 21-43-52-000-001), (Ref. TASK 21-43-52-400-001) and (Ref. CMM 214352).

R **ON A/C 401-499,
 Subtask 21-00-00-210-051-B
 AA. Post Cleaning and Inspection of the ECS
 WARNING : MAKE SURE THAT AIR IS NOT SUPPLIED TO THE AIR CONDITIONING
_______ SYSTEM FROM THE MAIN ENGINE, THE APU OR A GROUND SOURCE. HOT COMPRESSED AIR CAN CAUSE INJURY TO PERSONNEL.
 WARNING : DO NOT TOUCH THE COMPONENT UNTIL IT IS SUFFICIENTLY
_______
 COOL TO PREVENT BURNS.

 (1)
 Remove, clean (Ref. CMM 215204) and install:

 (a)
 The water extractors 10HM8, 11HM8 and the water-extractor drain lines (Ref. TASK 21-52-16-000-001) and (Ref. TASK 21-52-16-400-001).

 (b)
 The water injectors 20HM and 21HM (Ref. TASK 21-52-42-000-001), (Ref. TASK 21-52-42-400-001) and (Ref. CMM 215234).

 (2)
 Remove, overhaul (Ref. CMM 215102) or replace the pack flow-control units 23HB and 24HB (Ref. TASK 21-51-51-000-001) and (Ref. TASK 21-51-51-400-001).

 (3)
 Remove, overhaul (Ref. CMM 214302) or replace the the aft-cargo trim-air valve 12HC (Ref. TASK 21-43-51-000-001) and (Ref. TASK 21-43-51-400-001).

 (4)
 Remove, overhaul (Ref. CMM 214352) or replace the pressure regulating valve 11HC (Ref. TASK 21-43-52-000-001) and (Ref. TASK 21-43-52-400-001).

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 Subtask 21-00-00-865-059
 AB. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1HH, 2HH, 3HH, 4HH, 21HH, 22HH, 23HH, 24HH, 30HN, 31HN, 1KD, 2KD.

R **ON A/C 401-499,
 Subtask 21-00-00-865-059-A
 AB. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 49HH, 50HH, 51HH, 52HH, 53HH, 54HH, 55HH, 56HH, 30HN, 31HN, 1KD, 2KD.
 **ON A/C ALL
 Subtask 21-00-00-710-050
 AC. Checks and Test of the ECS

 (1)
 Do the pre-conditioning with the APU or through the HP ground connector (Ref. TASK 12-33-21-618-001) or (Ref. TASK 12-33-21-618-001).

 (2)
 Do a leak check of:

 (a)
 All the air pack and the air pack component connections at each of the air packs.

 (b)
 The mixer unit and the recirculation fan connections.

 (c)
 Any reconnected bleed-air duct connections.

 (3)
 Do the operational test of the cabin recirculation fans 14HG and 15HG (Ref. TASK 21-21-00-710-001).

 (4)
 Do the operational test of the AFT cargo-compartment heating system (Ref. TASK 21-43-00-710-003).

 (5)
 Do the operational test of the cockpit and cabin temperature control (Ref. TASK 21-63-00-710-004).

 (6) Stop the pre-conditioning (Ref. TASK 12-33-21-618-001) or (Ref. TASK 12-33-21-618-001). ________
5. Close-up
 Subtask 21-00-00-410-050
 A. Close access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Install the access panels 191BB, 192FB, 191KB and 192KB (Ref. TASK 53-35-13-400-002).

 (3) Remove the warning notice(s). Subtask 21-00-00-862-050
 B. De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).
 1EFF : ALL 1 21-00-00Page 233 1 1 Aug 01/05R 1 1 1CES 1

 TASK 21-00-00-615-002
 Decontamination of the Environmental Control System (ECS) when the Temperature is above 24 deg.C (APU)
 WARNING : MAKE SURE THAT THERE IS A GOOD FLOW OF AIR THROUGH THE WORK AREA WHEN
_______ YOU USE SPECIAL MATERIALS. IF YOU GET ONE OF THESE MATERIALS ON YOUR SKIN, IN YOUR MOUTH OR IN YOUR EYES : -FLUSH IT AWAY WITH A FLOW OF CLEAN WATER FOR BETWEEN 10 AND 15 MINUTES. -GET IMMEDIATE MEDICAL AID IF IRRITATION OCCURS. DO NOT BREATHE THE FUMES FROM THE MATERIAL. DO NOT SMOKE WHEN YOU USE THE MATERIAL. DO NOT USE THE MATERIAL NEAR A FLAME, SPARKS OR SOURCES OF HEAT. THESE MATERIALS ARE DANGEROUS : THEY ARE POISONOUS, FLAMMABLE AND SKIN IRRITANTS.
　
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