AGK Systems - Cabin Conditioning & Pressurisation Flashcards
AC must provide how much air per seat per minute?
1lb of air
AC must provide how much air per seat per minute following a failure of one AC pack§
0.5lb of air
What cabin temperature must the AC regulate?
18-24°C (65°C-75°F)
What are the Carbon Monixide levels the AC must ensure?
1 part in 20,000
What humidity must the AC ensure?
30%
What heat exchanger is bigger?
Secondary
What does a Pack Cooling Fan do?
Increase effectiveness of heat exchangers at low altitude, low speed and on the ground
Where is the biggest Temperature drop?
Secondary Heat Exchanger
Cabin Zones
Cabins are divided into zones
temp can be individually adjusted in each zone
Trim air is low pressure, high temperature air
FD has its own zone - does not have recirculating air like the cabin does
What is a Pressurisation System?
Controlled release of conditioned air
Conditioning System Schematic
What increases more rapidly, Cabin alt or A/c altitude?
A/C altitude climbs quicker than cabin altitude
Cabin Altitude - typically 8000ft
What is the typical cabin pressure differential?
8-9psi
Relationship between a/c altitude and cabin altitude
The higher the differential pressure, the more damaging it is to the a/c structure
What are the psi figures for:
Negative Relief Valve
Emergency Differential Pressure Valve
Outflow Valve
