(1)
Put a warning notice in position in the cockpit to tell persons not to start the APU or the engines.
(2)
Remove the section of bleed air duct forward of the flow control units 23HB and 24HB (Ref. TASK 36-12-41-000-001).
(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 the Bleed Air Ducts WARNING : OBEY THE MANUFACTURER'S INSTRUCTIONS WHEN YOU USE
_______ THIS/THESE MATERIAL/S. USE PROTECTIVE CLOTHING, RUBBER GLOVES AND GOGGLES.
(a) Clean contaminated bleed air ducts with a lint-free cloth and CLEANING AGENTS (Material No. 11-001K).
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(5) Install the removed sections of bleed air duct (Ref. TASK 36-12-41-400-001).
NOTE : Make sure that you do the leak check after the installation of
____
the bleed air ducts.
(6)
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).
(7)
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.
(8) Put protective covers on the open ends of the bleed-pressure regulator valves.
(9) Remove the warning notice(s). **ON A/C ALL
Subtask 21-00-00-860-075
B. Do the Procedure to Start 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 21-00-00-160-059
C. 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.
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(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 21-00-00-869-064
D. 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). Subtask 21-00-00-860-076-C
E. Aircraft Maintenance Configuration
(1)
On the AIR COND panel 30VU set the X BLEED selector to the AUTO position.
(2)
Connection 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
____
the bleed-air joint ducts.
Subtask 21-00-00-869-058
F. 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.
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_______ COOL TO PREVENT BURNS.
(1)
Remove the clamps and the sleeve between the condenser 10HM2 and the check valve 15HM (Ref. TASK 21-52-32-000-001).
(2)
Remove the clamps and the sleeve between the condenser 11HM2 and the check valve 16HM duct flange (Ref. TASK 21-52-32-000-001).
(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.
____
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