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79 Cards in this Set
- Front
- Back
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What 3 things make up the air management system
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Pneumatics
Environmental Control System Pressurization |
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Where can air come from for the pneumatic system
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Engines, APU, External source
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What does the ECS use air for
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Heating and cooling
Engine Start Pressurization Engine and Wing Anti-Ice Water pressure Hot air leak detection |
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How many AMS controllers are installed
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One controller with 2 channels that each control their respective side
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What happens if an AMS controller fails
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The remaining controller can control the entire AMS system
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What provides air for the AMS
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Engine bleeds
APU External pneumatic source |
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What is bleed air used for
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ECS (heating and cooling)
Engine and wing anti-ice Engine start Water pressurization |
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What is external pneumatic air used for
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ECS on the ground
Engine start on the ground |
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Where is the external ground source panel located
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Lower fairing between the wings
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What is the primary use for APU bleed air
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ECS on the ground
Engine starting on the ground Electrical in the air Assist with engine start flt Bleed source for pressurization |
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Can engine bleed air flow back to the APU
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No, a check valve prevents flow back
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Where is bleed air tapped from the engine
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6th-Low stage
10th-High stage |
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What is normal pressure for engine operation
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45 PSI
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What is the purpose of the precooler
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Cools the bleed air coming from the engine to the AMS
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What cools the precooler
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Grnd-N1 Fan
Flt-N1 Fan or ram air |
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What does the overheat detection observe
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-Engine bleeds
-Packs -APU Bleed -Plumbing for the wing and engine anti-ice |
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Do both overheat detection loops have to function to detect a leak
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Yes, but if one fails the other will work alone to detect the overheat
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How many loops does the overheat detection contain
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2
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How many ECS packs does the aircraft contain
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2 independent packs
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What provides air for the packs
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Each engine provides air to its respective pack
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Can a single pack provide adequate temperature and pressurization control
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Up to 31000 feet
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Can a single bleed source power both packs
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Yes, through the crossbleed valve
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What is the ratio of fresh air to recirculated air
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52% fresh air
48% recirculated air |
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When are the recirculation fans commanded off
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Pressurization dump pushed
Respective pack off Smoke detected in recirc bay Recirc button pressed off |
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What keeps the 3 avionics e bay cool
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FWD & CNT E BAY=3 fans pull air form the cabin to E Bay
AFT E BAY=Natural air flow from cabin to E Bay |
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When is the emergency RAM AIR ventilation activated
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Both packs commanded off or failed and below 25000 feet (LT Side elect. controlled)
Ram air pressure grater than cabin pressure (RT. Side) |
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How many channels on the cabin pressure controller (CPC)
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2, one active and one standby
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Where does the CPC get landing field elevation
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FMS or can be manually selected
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What happens when the DUMP button is pressed
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Both packs are commanded off,Recirc fans turn off, OFV opens, and cabin dumps at 2000 fpm up to 12400 feet
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Can the cabin altitude be raised higher than 12400 feet
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Yes, by using manual mode. The cabin altitude will rise due to natural leak
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What happens after the cabin altitude reaches 12400 after the DUMP button is presses
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The cabin will natural leak
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If in manual mode will the cabin depressurize upon landing
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No
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Will the DUMP button work in manual mode
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No
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What is the bleed system priority in flight
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Onside engine
Opposite side engine APU |
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If engine and APU bleed are available simultaneously which has priority
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APU if:
-On ground -Wheel speed <50 knots -Bleed pressure not enough for eng start |
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When will the cross bleed valve automatically open
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Only one side bleed source is available
Eng 2 start in the air Eng 1 start in the air if the APU is not available |
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What are some reasons the ECS packs will close
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-Any eng start if APU is the bleed source
-Eng start on the ground -Respective bleed system duct leak -Bleed air source not available for the pack -TL set to max on takeoff -REF A/I set to all on takeoff -REF ECS set to OFF on MCDU (APU is off) |
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When are the ECS packs recovered
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TL not MAX and:
Airplane is 500 AFE with both engines operating Airplane is >9700 MSL with one engine operating |
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What happens if smoke is detected in the recirc bay
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Both recirc fans deactivate
Cargo recirc fan deactivates Cargo outflow valve closes |
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Where does the CPCS get cruise flight and LFE
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FMS before takeoff or CPCS calculates using ambient pressure
The LFE may also be manually input |
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What color is the LFE on the EICAS
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Green-FMS input
Cyan-Manual input (An "M" will appear next to the LFE) |
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What is the abort mode
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Cabin is scheduled back to the takeoff altitude if:
Airplane stops climbing and begins a descent and airplane has not climbed >5000 AFE or >10000 MSL |
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What needs to be turned off when using an external air start
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Both packs to prevent contamination to the cockpit and cabin
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Pack 1 provides air to where
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Flight deck
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Pack 2 provides air to where
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Cabin
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How is the OFV controlled
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Its electric
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When will the gasper valve open
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Temperature reaches 95 F
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What stage is used for engine anti ice
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10 stage
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What stage is used for wing anti ice
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Combination of 6th and 10th
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What regulates bleed air temperature
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Pre-cooler
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Can the APU bleed be used for anti-ice
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No
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Where is the air vented out for the flight deck
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FWD E Bay
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How many fans in the FDW E Bay
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3
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How many fans in the CNT E Bay
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3
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Which fans are primary in the FWD and CNT E Bay
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1 and 3, 2 is a back up
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What is the minimum crossbleed PSI to start
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33 PSI
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What is the range of the temperature controller on the flight deck
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19-35 C
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When would you get a CAS message that the FWD E Bay fans have failed
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On ground:
2 fail backup fails Flow sensor fails In flight: All 3 need to fail |
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When would you get a CAS message in flight thay the CENT E Bay fans have failed
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If 2 fans fail in flight the message would be inhibited until on the ground after landing
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Positioning the cabin altitude knob UP or DOWN does what
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Raises and lowers the cabin 50/min
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Positioning the LFE knob UP or DOWN does what
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Raises or lowers the LFE in 100 ft increments
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When the pressurization mode is set to AUTO and the controller is set in LFE CTRL the system still considers itself in what mode
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AUTO mode
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The bleed control buttons say what
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Top half=Amber Bar=Leak
Bottom half-White Bar |
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What happens when a pack button is pushed out
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Shuts off respective flow control valve
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How many loops does the ODS use
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2 loops with six sensor locations
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Which cargo bay has ventilation
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FWD Cargo bay-For live animals
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If the CPC has no iformation to it what will it do
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It will operate in backup mode using temperatures
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How many smoke detectors are mounted in the recirculation bay
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Only one and if smoke is detected then both recirculation fans will be commanded off
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What target cabin pressure is used on the ground
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.01 psi differential lower than sensed cabin pressure
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When does the outflow valve close
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Gear down and engines providing takeoff thrust
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What are the two climb modes
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Internal (FMS inputs failed)
External (FMS inputs available) |
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When is abort mode not possible
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Aircraft is >10000 feet or higher than 5000 above T/O field elevation
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What are the CPC modes
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Ground
Takeoff Climb Cruise Descent Abort |
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When will the RAM AIR check valve open
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Whenever the pressure in the RAM AIR circuit is greater than cabin pressure
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How many fans in the FWD E-Bay
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3
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How many fans in the CNT E-Bay
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3
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How many fans in the AFT E-Bay
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None
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What does CABIN ALT DOWN do
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Manually closes the outflow valve, decreasing cabin altitude
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What does CABIN ALT UP do
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Manually opens the outflow valve, increasing cabin altitude
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