General Visual Inspection of Lavatory and Galley Ventilation Ducting (Zones 220 to 260)

TASK 21-20-00-210-002-A
General Visual Inspection of Lavatory and Galley Ventilation Ducting (Zones 220 to 260)

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.

ZONE: 220
ZONE: 260

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
220	FWD CAB UTILITY AREAS
260	AFT CABIN UTILITY AREA
251AX, 251BX, 251CX

C. Referenced Information

REFERENCE	DESIGNATION
TASK 21-20-00-010-001-A	Removal of the Air-Conditioning Distribution Ducts
TASK 21-20-00-410-001-A	Installation of the Air-Conditioning Distribution Ducts
TASK 21-23-00-720-001-A	Functional Test of the Galley/Lavatory Air Extraction Duct
TASK 25-23-41-000-001-A	Removal of the Ceiling Panels
TASK 25-23-41-400-001-A	Installation of the Ceiling Panels
TASK 25-23-43-000-001-A	Removal of the Upper Sidewall Panel
TASK 25-23-43-400-001-A	Installation of the Upper Sidewall Panel
TASK 25-23-44-000-001-A	Removal of the Lower Sidewall Panels (Dado Panels)
TASK 25-23-44-400-001-A	Installation of the Lower Sidewall Panels (Dado Panels)
TASK 25-23-48-000-001-A	Removal of the Cove Light Panel
TASK 25-23-48-400-001-A	Installation of the Cove Light Panel
Ventilation Ducting - Component Location

3. Job Set-up
Subtask 21-20-00-010-053-A

A. Get Access
(1) Remove the cabin ceiling panels between frames C16 and C65 (Ref. AMM TASK 25-23-41-000-001).

Subtask 21-20-00-010-052-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Remove, if installed, the aft lavatory/ies (refer to AMM chapter 25-43).

Subtask 21-20-00-010-052-B ** ON A/C NOT FOR ALL

B. Get Access
(1) Remove, when installed, the aft lavatory (refer to AMM chapter 25-43).

Subtask 21-20-00-010-054-A

C. Get Access
(1) Remove,
(a) the lower sidewall panel 251AX between frames C63 and C65 (Ref. AMM TASK 25-23-44-000-001),
(b) the upper sidewall panel 251BX between frames C63 and C65 (Ref. AMM TASK 25-23-43-000-001) and,
(c) the cove light panel 251CX between frames C63 and C65 (Ref. AMM TASK 25-23-48-000-001).

Subtask 21-20-00-865-054-A

D. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
122VU	AIR COND/RECIRC FAN/R/SPLY	3HG	W18
122VU	AIR COND/RECIRC FAN/L/SPLY	1HG	X18

Subtask 21-20-00-860-054-A

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

A. Inspection

Ventilation Ducting - Component Location

(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.

(2) Replace any worn, delaminated or damaged components and secure any loose installation (refer to examples in)
(Ref. AMM TASK 21-20-00-010-001) and,
(Ref. AMM 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. AMM TASK 21-23-00-720-001).

5. Close-up
Subtask 21-20-00-410-054-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install,
(a) the lower sidewall panel 251AX between frames C63 and C65 (Ref. AMM TASK 25-23-44-400-001),
(b) the upper sidewall panel 251BX between frames C63 and C65 (Ref. AMM TASK 25-23-43-400-001) and,
(c) the cove light panel 251CX between frames C63 and C65 (Ref. AMM TASK 25-23-48-400-001).

Subtask 21-20-00-410-052-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install, if removed, the aft lavatory/ies (refer to AMM chapter 25-43).

Subtask 21-20-00-410-052-B ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install, if removed, the aft lavatory (refer to AMM chapter 25-43).

Subtask 21-20-00-410-053-A

C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the cabin ceiling panels between C16 and C65 (Ref. AMM TASK 25-23-41-400-001).

Subtask 21-20-00-941-052-A

D. Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.02 06:10:53 UTC