Subtask 21-00-00-860-053-A
 H. Reconnection of the Bleed Air Ducts at the Engines
 WARNING : DO NOT TOUCH THE COMPONENT UNTIL IT IS SUFFICIENTLY

_______
 COOL TO PREVENT BURNS.

 (1)
 Remove the protective covers from the open ends of the bleed pressure-regulator valves.

 (2)
 Connect the bleed-air joint ducts (B) (Ref. TASK 36-11-49-400-042). NOTE : Make sure that you do the leak check after connection of the

____
 bleed-air joint ducts.

 Subtask 21-00-00-865-053
 J. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU AIR BLEED/ENG 1/MONG 2HA1 D11 122VU AIR BLEED/ENG 2/MONG 2HA2 Z22
 Subtask 21-00-00-865-054
 K. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------

R **ON A/C 401-499,
 49VU AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC 52HH D08 R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 122VU AIR COND/PACK TEMP/CTL SYS1/2/115VAC 21HH W22 122VU AIR COND/PACK TEMP/CTL SYS1/2/28VDC 23HH W21 122VU AIR COND/PACK TEMP/CTL SYS1/1/115VAC 1HH X22 122VU AIR COND/PACK TEMP/CTL SYS1/1/28VDC 3HH X21 122VU AIR COND/PACK TEMP CTL SYS2/2/28VDC 24HH Y21

 -------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION
 -------------------------------------------------------------------------------
122VU AIR COND/PACK TEMP CTL SYS2/2/115VAC  22HH  Y20 
R 
R  **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302, 
R  122VU AIR COND/PACK TEMP CTL SYS2/1/28VDC  4HH  Y19 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399, 
R  122VU AIR COND/PACK TEMP CTL SYS2/1/115VAC  2HH  Y18 
R  **ON A/C ALL 
R  122VU AIR COND/RECIRC FAN/R/CTL  11HG  W20 
R  122VU AIR COND/RECIRC FAN/R/SPLY  3HG  W18 
R  122VU AIR COND/RECIRC FAN/L/CTL  2HG  X20 
R  122VU AIR COND/RECIRC FAN/L/SPLY  1HG  X18 
R  **ON A/C 106-149, 303-399, 
R  122VU  4HH  Y19 
R  **ON A/C 401-499, 
R  122VU AIR COND/TEMP CTL SYS 2/CHAN A/115VAC  53HH  W22 
R  122VU AIR COND/TEMP CTL SYS 2/CHAN A/28VDC  55HH  W21 
R  122VU AIR COND/TEMP CTL SYS 1/CHAN A/115VAC  49HH  X22 
R  122VU AIR COND/TEMP CTL SYS 1/CHAN A/28VDC  51HH  X21 
R  122VU AIR COND/TEMP CTL SYS 2/CHAN B/28VDC  56HH  Y21 
R  122VU AIR COND/TEMP CTL SYS 2/CHAN B/115VAC  54HH  Y20
 122VU AIR COND/TEMP CTL SYS 1/CHAN B/115VAC  50HH  Y18 
R

 **ON A/C ALL
 Subtask 21-00-00-869-051
 L. Preparation for the Stage 1 Cleaning 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 the clamps and the sleeve between the condenser 10HM2 and the check valve 15HM.

 (2)
 Remove the clamps and the sleeve between the condenser 11HM2 and the check valve 16HM duct flange.

 (3)
 Put the special blanking caps on the open end of the check valve 15HM and on the open end of the check valve 16HM duct flange.

 NOTE : Use the removed clamps to secure the blanking caps.
____
 (4) Do a check for and make a note of any oil contamination in the condensors.
 NOTE : Water codensation can occur in the condensors. This must be
____
 ignored.

 (5) If oil contamination is found in the condensers you must:
 (a)
 Remove the cabin recirculation fans 14HG and 15HG (Ref. TASK 21-21-51-000-001).

 (b)
 Do a check for oil contamination in the interior of the mixer unit.

 (c)
 Cleaning of the Mixer Unit WARNING : OBEY THE MANUFACTURER'S INSTRUCTIONS WHEN YOU USE
　
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