(2)
 Remove the APU bleed-air duct elbow (A) forward of the load control valve,

 -
(Ref. TASK 49-11-11-000-001) or,

 -
(Ref. TASK 49-11-11-000-003) or,

 -
(Ref. TASK 49-11-11-000-004).

 (3)
 Do a check for and remove any large quantities of oil which may be present in the ducts or in the connector grooves of the 'v'-flanges.

 (4)
 Cleaning of Contaminated Ducts

 WARNING : OBEY THE MANUFACTURER'S INSTRUCTIONS WHEN YOU USE
_______ THIS/THESE MATERIAL/S. USE PROTECTIVE CLOTHING, RUBBER GLOVES AND GOGGLES.
 (a) Clean heavily contaminated ducts with lint-free cloth and CLEANING AGENTS (Material No. 11-001K).
 (5) Install the APU bleed-air duct elbow (A),
 -
(Ref. TASK 49-11-11-400-001) or,

 -
(Ref. TASK 49-11-11-400-003) or,

 -
(Ref. TASK 49-11-11-400-004).

 NOTE : Make sure that you do the leak check after installation of the
____
 bleed-air duct elbow.

 ECS - Component Location
 Figure 202B/TASK 21-00-00-991-001-B 
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1  1  Aug 01/05
 1  1
 1CES  1

 Subtask 21-00-00-869-050-A
 B. Preparation for Cleaning of the Cross Feed, the Engine and the APU Bleed Air Ducts
 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.
 (1)
 Make sure that:

 -the warning notice is in position in the cockpit to tell persons not to start the APU or the engines.

 (2)
 Disconnect the bleed-air joint ducts (B) on both engines at the bleed-pressure regulator valve side of the ducts (Ref. TASK 36-11-49-000-042).

 (3)
 Turn the bleed-air joint ducts (B) so that they face away from the engines and any electrical cables or equipment.

 NOTE : The open ends of the bleed-air joint ducts (B) must face in
____ such a direction that the hot bleed air can vent freely to atmosphere.
 (4)
 Put protective covers on the open ends of the bleed-pressure regulator valve.

 (5)
 Remove the warning notice(s).

 Subtask 21-00-00-865-051
 C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41
 Subtask 21-00-00-860-051
 D. Do the Start Procedure of the APU
 -
(Ref. TASK 49-00-00-860-003) or,

 -
(Ref. TASK 49-00-00-860-005) or,

 -
(Ref. TASK 49-00-00-860-008).

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 Subtask 21-00-00-160-050
 E. Cleaning of the Cross Feed, the Engine and the APU Bleed Air Ducts by "Residual Burning"
 WARNING : BE CAREFUL WHEN THE DUCTS ARE DISCONNECTED THE TEMPERATURE OF
_______ THE EXHAUST GASES FROM THE OPEN ENDS OF THE DISCONNECTED DUCTS CAN BE AS HIGH AS 270 DEG.C (518 DEG.F). THE HOT GASES CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
 NOTE : Make sure that no persons are near the engines when you do this
____
 cleaning procedure.

 (1) On the AIR COND panel 30VU:
 (a)
 Make sure that:

 -
the APU BLEED pushbutton switch ON legend shows on.

 -
the OFF legend on the PACK 1 and the PACK 2 pushbutton switches shows off.

 (b)
 Set the X BLEED selector to the OPEN position.

 (2) Run the APU for approx. 15 minutes. Subtask 21-00-00-860-052
 F. Aircraft Maintenance Configuration
 (1)
 Do the Procedure to Stop the APU

 -
(Ref. TASK 49-00-00-860-004) or,

 -
(Ref. TASK 49-00-00-860-006) or,

 -
(Ref. TASK 49-00-00-860-009).

 (2)
 On the AIR COND panel 30VU set the X BLEED selector to the AUTO position.

 Subtask 21-00-00-865-052
 G. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41
　
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