-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
21-20-00-991-005 Fig. 603
3. Job Set-up
__________
Subtask 21-20-00-010-053
A. Get Access
(1) Remove the cabin ceiling panels between frames C16 and C65 (Ref. TASK 25-23-41-000-001).
**ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
Subtask 21-20-00-010-052
B. Get Access
(1) Remove, if installed, the aft lavatory/ies (Ref. TASK 25-43-41-000-001), (Ref. TASK 25-43-44-000-001).
R **ON A/C 151-199, 401-499,
Subtask 21-20-00-010-052-A
B. Get Access
(1) Remove the aft lavatory (Ref. TASK 25-43-41-000-001).
**ON A/C ALL
Subtask 21-20-00-010-054
C. Get Access
(1) Remove,
(a)
the lower sidewall panel 251AX between frames C63 and C65 (Ref. TASK 25-23-44-000-001),
(b)
the upper sidewall panel 251BX between frames C63 and C65 (Ref. TASK 25-23-43-000-001) and,
(c)
the cove light panel 251CX between frames C63 and C65 (Ref. TASK 25-23-48-000-001).
Subtask 21-20-00-865-054
D. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------122VU AIR COND/RECIRC FAN/R/SPLY 3HG W18 122VU AIR COND/RECIRC FAN/L/SPLY 1HG X18
Subtask 21-20-00-860-054
E. 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 and the LP ground connector put a warning notice in position to tell persons not to supply the ground air.
4. Procedure
_________
Subtask 21-20-00-210-051
A. Inspection
(Ref. Fig. 603/TASK 21-20-00-991-005)
(1) Do a general visual inspection of the of the ventilation ducts for:
-breakages, cracks and delamination of the composite material,
-security of installation of the duct system and,
-correct installation and general condition of the duct connections.
- on unused connection points make sure that the blanking caps are in a good condition and are secure.
1EFF : ALL 1 21-20-00Page 616 1 1 May 01/04R 1 1 1CES 1
Ventilation Ducting - Component Location Figure 603/TASK 21-20-00-991-005
1EFF : 1 1R 1CES ALL 1 11 1 21-20-00 Page 617 May 01/04
(2) Replace any worn, delaminated or damaged components and secure any loose installation (refer to examples in) (Ref. TASK 21-20-00-010-001) and, (Ref. TASK 21-20-00-410-001)
NOTE : If you replace any compoments in the system you must do the
____ functional test of the galley/lavatory air extraction duct (Ref. TASK 21-23-00-720-001).
5. Close-up
________
Subtask 21-20-00-410-054
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Install,
(a)
the lower sidewall panel 251AX between frames C63 and C65 (Ref. TASK 25-23-44-400-001),
(b)
the upper sidewall panel 251BX between frames C63 and C65 (Ref. TASK 25-23-43-400-001) and,
(c)
the cove light panel 251CX between frames C63 and C65 (Ref. TASK 25-23-48-400-001).
R **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
Subtask 21-20-00-410-052
B. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Install, if removed, the aft lavatory/ies (Ref. TASK 25-43-41-400-001), (Ref. TASK 25-43-44-400-001),
