Installation of the Air Chiller Unit - Forward Galley

TASK 25-34-51-400-001-A
Installation of the Air Chiller Unit - Forward 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: 220

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
220	FWD CAB UTILITY AREAS

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 - Galley 1

3. Job Set-up
Subtask 25-34-51-860-050-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 trolleys are removed from the galley.
(3) On the AIR COND panel 30VU:
(a) Make sure that the APU BLEED, the ENG 1/2 BLEED and the PACK 1/2 pushbutton switches are released.

NOTE: For the APU BLEED pushbutton switch, the ON legend is off.
For the ENG 1/2 BLEED pushbutton switch, the OFF legends are on.
For the PACK 1/2 pushbutton switch, the OFF legends are on.

(b) Make sure that a WARNING NOTICE(S) is in position to tell persons not to operate these pushbutton switches.
(4) Make sure that a WARNING NOTICE(S) is in position to tell persons not to connect the ground air supply:
On the High Pressure (HP) ground connector
On the Low Pressure (LP) ground connector.

Subtask 25-34-51-865-077-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	FWD GALLEY/FEEDER F	16MC	AC10

4. Procedure
Subtask 25-34-51-210-050-I ** 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 interface and/or the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(a) Make sure that the air grill cover (4) is clean and that the grill is not blocked.

Air Chiller - Galley 1 ** ON A/C NOT FOR ALL

Subtask 25-34-51-420-050-H ** ON A/C NOT FOR ALL

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

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.

(2) Install the Air Chiller

Air Chiller - Galley 1 ** ON A/C NOT FOR ALL

(a) Carefully put the air chiller (7) in position on the rails (5) and install the screws (6).
(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 (4) to the connector (3).
(e) Push the air chiller (7) into its compartment.
(f) Put the air grill (2) in position and install the screws (1).

Subtask 25-34-51-865-078-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	FWD GALLEY/FEEDER F	16MC	AC10

Subtask 25-34-51-942-050-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 25-34-51-710-050-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 forward galley are closed.

ACTION	RESULT
1.On the overhead panel, on ELEC 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 ELEC 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 25-34-51-410-050-F ** 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 25-34-51-862-050-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] 2026.04.01 06:15:24 UTC