Air Conditioning and Cooling System Flashcards
(43 cards)
How many temperature control zones?
5
However technically 7 because A and B
are divided up into A1 A2 B1 B2
Describe the Air Conditioning System
2 Packs
each powered by 2 electrical CAC’s
All control is Automatic
What can be done if both Packs become inop?
Alternate Ventilation systems switch
guarded on the bottom of the panel
What is the Automatic Temperature for the Baggage
21 degrees for FWD and Bulk
AFT is heated but not controlled
(AFT NO live animals)
Describe the Equipment cooling system
FWD and AFT E/E
Miscellaneous E/E
Where does the heat from the FWD E/E go
What does it cool?
FWD Cargo Compartment
also cools the FWD E/E and flight deck equip
Where does the hear from the AFT E/E go
AFT Cargo and Bulk Compartment
only source of heat for the AFT compartment
What does the Miscellaneous E/E cooling system cool
Inflight Entertainment (IFE)
What are the Fluid cooling systems
Power Electronics Cooling System (PECS)
Integrated Cooling System
What is PECS
Power Electronics Cooling System
Liquid cooling system for the Large motor power distribution system in the AFT E/E equipment compartment
cools the integrated cooling system as well
fluid is 50/50 anti freeze/water
Orange
What is the ICS
integrated cooling system provides refrigeration for galley carts
How is the pressurization controlled
fully automatic by the FMC
can be manual
When are the CAC’s load shed?
When ground eng start
When do the CAC inlet deflector door operate?
on the ground and < 1,000 ft
retract in extreme temps > 35 degrees < 2 degrees
What is the purpose of the pack
to turn Hot, Moist air –> Cold, Dry air
7 steps
What are the 7 steps for conditioning air in the packs
heat exchanger compressor heat exchanger condensor turbine T1 condensor (cools coils) Turbine T2
(T1 &T2 drive the compressor together all 3 are the Air cycle machine ACM)
How is warm air provided
from the Trim Air System
hot air from the 2 CAC’s per side
Which Zones are heated from which Trim Heat?
Right - A C
Left - B D
flight deck from both L & R
Describe the Recerc Fans system
Upper
passenger area
Lower system
Baggage area
(filters air and reintroduces it)
How is the Flight Deck different than the cabin?
100% outside air
slightly higher pressure to prevent smoke
Describe the Humidity systems
Humidification system in the flight deck
De-humidification system in the cabin, 2 Zonal dryers
moist air exhausted below cabin floor
What are the temp ranges?
FLT Deck 18-29 degrees
(12 o’clock is usually 24 deg)
Cabin Temp 18-29 deg
(12 O’clock us usually 24 deg)
How is the temp control for the cabin different
Temp selector sets master cabin reference not temp.
CAP controls the temp 6 deg either side of the master temp
usually at 12 O’clock (24) so CAP can control 18-29 deg
Where does the temp control for the Crew Rest compartment come from?
Zone D
(you can warm it with the electric heater but cant cool it
