Cabin Interior: Aircraft Galleys

Malaysian Institute of Aviation Technology
Aircraft galleys

Introduction to Galleys
• Electrical appliances and trolleys
• Galley equipment can include:
- Storage locations for trolleys and carts
- Beverages makers
- Ice makers - Water supply (hot and cold)
- Water heater - Trash compactors
- Lighting - Interphone system
- Fume extraction system - Water waste system
- Toasters etc - Screen curtains
- A means of chilling cold cupboards
(usually provided by a vapor cycle chiller unit located near to
the galley

• power is controlled by a switch on the Flight
Engineer’s upper panel. also control switches in
the galley for individual equipment control.
• Fitted at the back of the a/c or, at centre
location for larger a/c
Aircraft galleys

Malaysian Institute of Aviation TechnologyGALLEYS

Fig 31 Galley 1

A320 Rear Galley
The galley is made up of two half width modules
that may be located separately on some a/c.
Note the positive locking of the service trolley – by
regulation

Galley Seat Track Fitting
- Galley are located onto and bolted down to the
seat tracks, in a manner not dissimilar to seats.
In addition, tie rods are attached between the top
of the galley and the a/c fuselage.

Galleys
• Use a considerable amount electric, have their own
feeder circuits that will be load-shed automatically in
times of high current demand.
• power may come direct from the secondary a/c
busses or be provided through Electric Load Control
Units, ELCU’s, measure the current being drawn by
the galleys and prevent overload.
• ELCU also act as a switch to remove the power to the
whole galley complex should a/c power consumption
become high.

Galleys
• have an electric distribution panel accessible
from the front of the galley
i.e. allows for individual isolation of ovens etc by
C/B action.
• This panel has a light to indicate that power to
the galley is on.
• All system have control switches and are
located close to the galley, a master isolation
switch for both electric and water supply.

Galley Chiller Unit

Galley Chiller Unit
• Is a small Vapour Cycle Cooling Pack (VCCP).
• switched on from the galley control panel.
• The fan motor drives two fans:
- 1st draws air from the cold cupboard, and after
cooling, passes it back to the cold cupboards in the
galley.
- 2nd draws in ambient air to act as a heat sink from
the condenser (cools the condenser), it is discharged
overboard.
• Chiller air is drawn across the evaporator and cooled
by heat transfer to the refrigerant (Freon/similar) and
passed back trough the ducting to the cold cupboards.

Galley Chiller Unit- VCCP
• VCCP relies on the principles that as the refrigerant
changes state from liquid to gas (from the chiller air)
• A timer operates the VCCP in 10 min cycles.
• If at the end of the cycle, the temp of refrigerant is
less than 26°F (-3°C), then automatic defrost is
initiated, this involve the fan being shutdown and the
hot gas by-pass valve being opened. Defrost stops
when the temp reaches 4°C.

Galley Chiller Unit- VCCP
• Some chiller may be shut down when the cargo fire
extinguisher system is armed.
• To help reduce the noise levels from chiller, they are
mounted on anti-vibration mounts.
• Maintenance of the chiller unit is confined to checking
for security, leaks, damage and correct contents level

Automatic shut down is
initiated if any operating
parameters are
exceeded eg:
i. Refrigerant
temperature higher than
54°C.
ii. Refrigerant pressure
higher than 300psi
iii. Refrigerant pressure
lower than 5psi
iv. Compressor over
temps.

Other Galley Equipment
• Trash Compactor
- is a large press that squashes the trash to reduce
its volume. If this is not fitted the galley will have a
simple bin arrangement that has a hinged top
access panel.
• Beverages makers
- are installed to brew hot drinks. Electrically
powered, with a supply of potable water. Have
lights on the front the indicate low water and
system On.

- On twin deck aircraft to allow the
carts (service trolley) to be loaded
on the lower deck and transported
to the upper deck galley.
-
-On B747,the lift is driven by two
motors that drive a vertical screw
jack.
- lift is attached to ball nut assemble
that allows the lift to be lowered and
raised between floors.
GALLEY LIFT

-Micro switches prevent the lift from
moving unless the door is closed.
- Mechanical locks will prevent the
access door to the lift shaft from
being opened unless the lift is
in front of it.
GALLEY LIFT - continue

Oven and Water Heater
-oven is fitted on top and the water
heater at the bottom.
-The control panels are at the topmost
and the middle of the installation.

Power switch

The oven is fitted with a fan and heater with a timer and
heater control. The oven system consists of:
Oven with a side opening door and electrically
connected via a connector at the rear.
A two position Galley On-Off Switch on the P4
panel.
A two position Oven On-Off Switch, power light
(amber) & fuse on the lower control panel
A Power On Light (Red) and Timer Select Rotary
Switch on the upper control panel.
A Heater On Light (Amber) and Temperature
Select Rotary Switch on the upper control panel.

The water heater system consist of:
Water heater that slides into a holder and
simultaneously electrically connects to the power
supply via two pins located at the back of the water
heater.
A Water Heater On-Off switch, power light
(amber) and fuse on the lower control panel.
A Water heater temperature select rotary switch
fitted on the lower control panel.
Then power is routed through a fuse and a
switch on the oven lower control panel

Power On
light and
Operation
time rotary
switch
Heater On light
and Temperature
rotary switch
Water
Heater
On-Off
Switch,
Light &
Fuse
Oven On-
Off Switch,
Light &
Fuse

Oven Operation
1.The oven is switched on by putting the galley two
position (On-Off) switch on P4 to ON.
2. The oven two position (On-Off) switch on the
lower control panel is selected ON And the
power light illuminates (amber).
3. The Power On red light on the left-hand side of
the top control panel will illuminate when the timer
rotary switch is selected. The timer may be selected
up to 60 minutes of oven operation and is
graduated every minute. 0, 10, 20, 30, 40 and
50 minutes are marked.

Oven Operation
1.Heating amber light on the right hand side of the top
control panel will illuminate when the temperature
rotary switch is selected, temperature may be selected
up to 450 degrees and is graduated every 50 degrees.
150, 250, 350 and 450 degrees are marked.
2.The oven is switched off by selecting the oven switch
on the lower control panel to Off

Power On
light and
Operation
time rotary
switch
Heater On
light and
Temperatur
e rotary
switch
Water
Heater
On-Off
Switch,
Light &
FuseOven
On-Off
Switch,
Light
& Fuse

Water Heater Operation
1.The water heater oven is switched on by putting
the galley two position (On-Off) switch to ON.
2.The water heater two position (On-Off) switch on
the lower control panel is selected ON.
3.The Temperature Select rotary switch rotated to
the desired temperature. And the power light
illuminates (amber).
4.The water heater is switched off by selecting the
water heater switch on the lower control panel to
Off

Oven and water
heater
installationcover
panel.
OVEN AND HEATER MAINTENANCE PRACTICES
The water heater is removed/installed by sliding
in or out from the holder.
Oven removal/installation is carried out by
removing a cover panel located in the toilet (4 bolts)

2 installation
bolts
Oven
connector
1. Remove cover panel.
2.Disconnect connector at the
top rear of oven.
3.Remove two bolts at the
bottom forward of oven fixture.
4.Slide oven out from the front
out of the fixture.
5 Installation is carried out
by reversing the
above actions.
Oven Removal/Installation

Cabin Interior: Aircraft Galleys

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Cabin Interior: Aircraft Galleys