R  **ON A/C 106-149, 303-399, 401-499,
 Subtask 21-51-51-941-054
 C. Safety Precautions
 (1) On the panel 30VU:
 (a) Make sure that: - the APU BLEED pushbutton switch is in the off position (the ON legend is off) and, - the ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are in the off position (the OFF legends are on).
 (b) Put a warning notice in position to tell persons not to operate these pushbutton switches.
 (2) On the HP ground connector put a warning notice in position to tell persons not to supply the ground air.
 Subtask 21-51-51-010-062
 D. Get Access
 (1) Remove the access panels (Ref. TASK 53-35-13-000-002): 
R  (a) FOR 23HB - 191KB and - 191BB. 
R  (b) FOR 24HB - 192KB and - 192FB.
 4. Procedure_________
 Subtask 21-51-51-020-069
 A. Removal of the Air Duct Assembly 
R  **ON A/C 106-149, 303-399, 
R  (Ref. Fig. 403A/TASK 21-51-51-991-006) 

R 1EFF : 106-149, 303-399, 401-499, 1 21-51-51Page 481 1 1 Aug 01/05 1 1 1CES 1R **ON A/C 401-499,

 (Ref. Fig. 403B/TASK 21-51-51-991-006-A) R **ON A/C 106-149, 303-399, 401-499,
 (1)
 Remove the nut (1), the washer (2), the screw (3) and disconnect the bonding strap (4).

 (2)
 Remove the nuts (10), the washers (9), the bolts (7) and the bushings

 (8) from the support rods (5).

 (3)
 Remove the v-clamps (12) and (13).

 (4)
 Remove the air duct assembly.

 (5)
 Remove and discard the o-ring (11).

 (6) Put protective covers on the open duct ends.
 Subtask 21-51-51-020-070

 B. Removal of the Support Rods
 (Ref. Fig. 405A/TASK 21-51-51-991-008)

 (1)
 Remove the nuts (24), the washers (23), the bolts (20), the bushings

 (21) and the support rods (5) from the attachment brackets (22).

 (2)
 Do the inspection of the components for in-service wear (Ref. TASK 21-51-51-200-002).

R 1EFF : 106-149, 303-399, 401-499, 1 21-51-51Page 482 1 1 Aug 01/05 1 1 1CES 1 TASK 21-51-51-400-002-A

 Installation of the Air Duct upstream of the Flow Control Unit
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific Torque Wrench : range 0.00 to 1.20 m.daN
 (0.00 to 9.00 lbf.ft)
 B. Expendable Parts
 -------------------------------------------------------------------------------FIG.ITEM |DESIGNATION |IPC-CSN -------------------------------------------------------------------------------
15 o-ring 21-51-03 11E-090 27 tab washer 21-52-03 84 -080
 C. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
12-33-21-618-001 Pre-conditioning through the HP Ground Connection 12-33-21-618-001 Pre-conditioning with the APU 20-28-00-912-004 Electrical Bonding of Components With Conductive
 Bolts and Screws and Bonding Straps in the Fuselage and in the Wings (this does not include the tanks)-21-61-00-710-001 Operational Test of the Pack Temperature-Control System 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power 53-35-13-000-002 Removal of the Quick-Release Access Panels from the Belly Fairing Structure
R 1EFF : 106-149, 303-399, 401-499, 1 21-51-51Page 483 1 1 Aug 01/05 1 1 1CES 1

 -------------------------------------------------------------------------------
REFERENCE DESIGNATION -------------------------------------------------------------------------------
53-35-13-400-002 Installation of the Quick-Release Access Panels on the Belly Fairing Structure 21-51-51-991-008 Fig. 405A
 3. Job Set-up
__________
 Subtask 21-51-51-860-053

 A. Aircraft Maintenance Configuration
 (1) Make sure that:
 (a)
 The aircraft electrical circuits are energized (Ref. TASK 24-41-00-861-002),

 (b)
 On the panel 30VU: 1 The APU BLEED pushbutton switch is in the off position (the ON

_
 legend is off).

 2 The ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are in
　
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