(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.
Subtask 21-00-00-869-053-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 21-00-00-865-061
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
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Subtask 21-00-00-860-059
D. Do the Start Procedure for 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).
Subtask 21-00-00-160-053
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 21-00-00-869-062
F. 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).
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Subtask 21-00-00-860-060-A
G. Aircraft Maintenance Configuration
(1)
On the AIR COND panel 30VU set the X BLEED selector to the AUTO position.
(2)
Reconnection of the Bleed-Air Joint Ducts at the Engines WARNING : DO NOT TOUCH THE COMPONENT UNTIL IT IS SUFFICIENTLY
_______
COOL TO PREVENT BURNS.
(a)
Remove the protective covers from the open ends of the bleed pressure-regulator valves.
(b)
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
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