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 Technology GALLEYS


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

Installation


-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

Malaysian Institute of Aviation Technology Oven and Water Heater

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

Malaysian Institute of Aviation Technology Oven and Water Heater

Power On

light and

Operation

time rotary

switch

Heater On

light and

Temperatur

e rotary

switch

Water

Heater

On-Off

Switch,

Light &

Fuse Oven

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 installation cover

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

Engineering

Cabin Interior: Aircraft Galleys