Air Conditioning And Pressure Flashcards
How do large aircraft supply the air-con packs?
Bleed air.
Provide blank lbs of air per seat per minute in normal operation for air conditioning pacs.
1lbs
Provide at least lbs per seat per minute following failure of one air conditioning pack.
0.5lbs
Control cabin temperature within the range x-x°C (65°−75°F) with aircon.
18-24.
Ensure that carbon monoxide is less than 1 part in blank in an aircon unit.
20000.
Is the primary heat exchanger bigger or smaller than the secondary heat exchanger in an aircon pac?
Smaller.
Where is the greatest temperature drop in an aircon pack?
Secondary heat exchanger.
What does the pack cooling fan do in an aircon unit?
Increases the efficiency of cooling on the ground.
What temperature is trim air in an air conditioning pack
Hot.
In air distrabution blank % is recirculated after passing through HEPA filters.
50%
What do HEPA filters stop?
99% of bacteria.
What is the definition of pressurisation?
The controlled release of conditioned air.
What is the pressure differential between cabin pressure between the air and the cabin?
8-9psi.
If the cabin altitude exceeds blank ft audio alarm sounds
10,000ft
What is the cabin altitude deployment of o2 masks?
14000’
When is the pressure mode differential?
When climbing or decending .
How many seconds is a normal decompression?
6 to 10 seconds.
How many seconds is a rapid decompression?
4 to 6 seconds.
How many seconds is a explosive decompression?
0 to 3 seconds.
Blank ft: visual and aural CABIN ALT warning - pressure
10,000ft
Blank ft: AUTO FAIL light on the pressure controller panel
13,850ft.
Blank ft: passenger oxygen masks automatically drop
14,000ft
How is an aircraft windscreen deiced? AC/DC
A C system.
Cabin pressure is controlled by outflow/inflow valves.
Outflow
The primary heat exchanger precools the engine bleed air and the secondary heat exchanger cools air behind the pack`s x.
Compressor
How do de-icing rubber boots on the leading edge of a wing work?
High pressure.
