Installation of the Air Chiller Unit - Aft Galley

TASK 25-34-51-400-002-A
Installation of the Air Chiller Unit - Aft Galley

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

WARNING: BE CAREFUL WHEN YOU REMOVE OR INSTALL THIS EQUIPMENT. THIS EQUIPMENT IS HEAVY (MORE THAN 12 KG (26.5 lb)) AND CAN CAUSE INJURY AND/OR DAMAGE.

ZONE: 260

1. Reason for the Job
Self Explanatory

NOTE: More than one person is necessary for this procedure.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
260	AFT CABIN UTILITY AREA

C. Referenced Information

REFERENCE	DESIGNATION
TASK 20-21-11-911-001-A	Tightening Torques for Standard Threaded Fasteners
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
Air Chiller - AFT Galley

3. Job Set-up
Subtask 25-34-51-860-051-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized (Ref. AMM TASK 24-42-00-861-001).
(2) Make sure that the contents are removed from the galley.
(3) Make sure that the decorative material(s) is (are) removed.
(4) Make sure that the galley trolley(s) is (are) removed.
(5) Make sure that on the AIR section of panel 30VU:
(a) The APU BLEED, ENG 1 BLEED, ENG 2 BLEED and PACK 1 and PACK 2 pushbutton switches are in the OFF position.

NOTE: For the APU BLEED the ON legend is off.
For the ENG 1 BLEED and the ENG 2 BLEED the OFF legends are on.
For PACK 1 and PACK 2 the OFF legends are on.

(b) The WARNING NOTICE(S) is (are) in position to tell persons not to operate these pushbutton
(6) Make sure that on the High Pressure (HP) and the Low Pressure (LP) ground connectors, the WARNING NOTICE(S) is (are) in position to tell persons not to connect the ground air supply.

Subtask 25-34-51-865-089-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
122VU	ELEC/GALLEY/CNTOR	7MC	S28
122VU	ELEC/GALY & CAB/CTL	1XA	S26
122VU	AIR COND/LAV/GALLEY VENT CTL/EXTRACT FAN/CTL	5HU	U21
122VU	AIR COND/LAV/GALLEY VENT CTL/EXTRACT FAN/SPLY	6HU	U19
123VU	AFT GALLEY/FEEDER E	14MC	AF09
123VU	AFT GALLEY/FEEDER A	3MC	AF04

4. Procedure
Subtask 25-34-51-210-051-E ** ON A/C NOT FOR ALL

A. Preparation for Installation
(1) Clean the component interfaces and the adjacent area.
(2) Do a visual inspection of the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.

Subtask 25-34-51-420-052-W ** ON A/C NOT FOR ALL

B. Installation of the Air Chiller Unit - AFT Galley
(1) Unless specified, TORQUE all nuts, bolts and screws (Ref. AMM TASK 20-21-11-911-001).
(2) Install the Air Chiller

Air Chiller - AFT Galley ** ON A/C NOT FOR ALL

WARNING: SUPPORT THE UNIT/ASSEMBLY. THE UNIT/ASSEMBLY IS HEAVY. IF YOU DO NOT SUPPORT IT, IT WILL FALL. THIS CAN CAUSE INJURY TO PERSONS, AND/OR DAMAGE TO EQUIPMENT.

(a) Carefully put the air chiller (10) in position and install the washers (11) and the screws (12).
(b) Remove the CAP-BLANKING from each electrical connector and receptacle.
(c) Make sure that all the electrical connections are clean and in the correct condition.
(d) Connect the electrical connector (8) to the connector (9).
(e) Put the access panels (2) and (4) in position and install the screws (1) and (3).
(f) Put the divider panels (7) in position and install the washers (6) and the screws (5).

Subtask 25-34-51-865-090-A ** ON A/C NOT FOR ALL

C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
122VU	ELEC/GALLEY/CNTOR	7MC	S28
122VU	ELEC/GALY & CAB/CTL	1XA	S26
122VU	AIR COND/LAV/GALLEY VENT CTL/EXTRACT FAN/CTL	5HU	U21
122VU	AIR COND/LAV/GALLEY VENT CTL/EXTRACT FAN/SPLY	6HU	U19
123VU	AFT GALLEY/FEEDER E	14MC	AF09
123VU	AFT GALLEY/FEEDER A	3MC	AF04

Subtask 25-34-51-942-051-A ** ON A/C NOT FOR ALL

D. Safety Precautions
(1) Remove the warning notice(s) from:

The HP and LP ground-air connectors
The AIR COND section of panel 30VU.

Subtask 25-34-51-710-051-A ** ON A/C NOT FOR ALL

E. Operational Test
(1) Do the operational test of the air chiller unit:
(a) On the galley control panel, make sure that all the applicable circuit breakers of the aft galley are closed.

ACTION	RESULT
1.On the overhead panel, on the ELEC section of panel 35VU: Push the GALLEY or GALY & CAB pushbutton switch (2XA).	On the GALLEY or GALY & CAB pushbutton switch (2XA): The OFF legend goes off.
	On the galley control panel: The POWER indicator comes on.
2.On the galley control panel: Set the AIR CHILLER ON/OFF switch to the ON position. Set the AIR CHILLER ON/OFF switch to the OFF position.	On the galley control panel: The SYSTEM OPERATE indicator comes on. The SYSTEM OPERATE indicator goes off.
3.On the overhead panel, on the ELEC section of panel 35VU: Push the GALLEY or GALY & CAB pushbutton switch (2XA).	On the GALLEY or GALY & CAB pushbutton switch (2XA): The OFF legend comes on.
	On the galley control panel: The POWER indicator goes off.

5. Close-up
Subtask 25-34-51-410-051-L ** ON A/C NOT FOR ALL

A. Close Access
(1) If the galley trolley(s) is (are) removed, install it (them).
(2) If the decorative material(s) is (are) removed, install it (them).
(3) If the contents of the galley are removed, install them.
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(5) Make sure that the work area is clean and clear of tools and other items.

Subtask 25-34-51-862-051-A ** ON A/C NOT FOR ALL

B. De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.03.31 23:34:01 UTC