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23 Cards in this Set

  • Front
  • Back
What area of the aircraft does the right hand pack normally supply air to? What area does the left hand pack supply?
Left Pack – flight deck
Right Pack – passenger cabin
Both packs are located in the aft equipment bay
What supplies cooling air to the heat exchangers?
Ram air scoop
When is RAM AIR ventilation used?
When 10th stage bleed air is lost, contaminated, or disabled
How is flight compartment exhaust air routed out of the aircraft?
TO cabin – Distribution Manifold
FROM cabin – outflow valves
What controls cabin air outflow?
Outflow valves on aft bulkhead regulate vacuum pressure to cycle valves
CPCs control amount of pressure (2 CPCs, one active at a time)
What is the source of vacuum for the outflow valve?
Outside air for outflow valves
Jet pump driven by 10th stage bleed air to create vacuum and actuate the valves
The pressurization system automatically pre-pressurizes the aircraft to what altitude prior to takeoff?
-150ft pressure at ~300fpm
What is the rate of change of the cabin altitude during climb and descent in the pressurization system in automatic mode?
300-500fpm increase when ascending
300fpm decrease when descending, down to 150ft below field elevation
500fpm increase when throttle idle with WOW detected – very short, then valves full open
1000fpm+ decrease when descending in flight abort mode
Maximum negative differential pressure is controlled at what pressure?
-0.5 PSI
What does the CPAM automatically do if the cabin altitude reaches 14,000 feet?
Disables use of bleed air crossflow for engine start (engine starts not permitted above 13,000ft)
What happens when the pressurization control switch/light is pressed in?
Engages manual cabin pressure control
What happens when the EMER DEPRESS switch/light is pressed in?
Opens both outflow valves to rapidly depressurize the aircraft (uncontrolled depressurization)
What happens when the manual cabin altitude regulator is selected to the up or down position?
Manual pressure change occurs at set rate
When in Manual (MAN) mode where is the pressurization readout displayed?
ECS screen on EICAS
What fire detection systems are used in or around the wing anti-icing system?
Single loop overheat detector in fuselage and thermal switches in wing leading edges, also leak detection using bleed air ducts called piccolo tubes
How does the air cycle machine work?
Turbine powered air conditioner
How many Packs does the CRJ-100/200/600/700 have?
2
What stage does CRJ bleed air come from?
10th
How many outflow valves does the CRJ have?
2
What does EMER DEPRESS do?
Opens both outflow valves to rapidly (uncontrolled) depressurize aircraft
"Packs"
Air conditioning units under pressure from 10th stage bleed air
"CPC"
Cabin Pressure Controller
Monitors cabin pressure and regulates relevant valves
"CPAM"
Cabin Pressure Acquisition Module
Provides data regarding cabin pressure to EICAS