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33 Cards in this Set
- Front
- Back
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What does the AMS use bleed air for?
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ECS
Engine start Pressurization Engine and wing anti-ice Water pressurization Hot air/leak detection |
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How many AMS controllers are installed?
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One, with 2 channels
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What happens if a channel fails?
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The remaining channel is able to control the entire AMS
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What provides air for the AMS?
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Engine bleeds
APU bleed External air source |
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What is bleed air used for?
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ECS
Engine start Engine and wing anti-ice 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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What is the primary use for APU bleed air?
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ECS on the ground
Engine start on the ground Pressurization <15,000 ft |
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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 engines?
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6th and 10th stage compressors
System alternates between valave to regulate an adequate and safe pressure |
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What is normal bleed pressure for any engine operation?
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45 psi
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What is the purpose of the pre-cooler?
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Cools bleed air from the engine to the AMS
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What cools the pre-cooler?
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Ground: N1 fan
Flight: N1 fan or ram air |
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What does the Overheat Detection System observe?
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Engine bleeds and packs
APU bleed Plumbing for wing and engine anti-ice |
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How many ECS packs are on the airplane?
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2
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What provides air for the packs?
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Each engine provides bleed air to its respective pack
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Can a single pack provide adequate temperature control and pressurization?
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Yes, up to FL310
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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, 48% recirculated
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When are the recirc fans commanded off?
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Cockpit switch
Smoke detected in the recirc bay DUMP button is pressed Respective pack is commanded off |
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When is the Emergency Ram Air Ventilation activated?
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Both packs commanded or failed OFF below 25,000 feet
Ram air pressure is greater than cabin pressure |
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Where does the CPC get Landing Field Elevation?
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FMS or manually entered
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What happens when the dump button is pressed?
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Commands both ECS packs to OFF
Opens OFV and raises the cabin to 12,400 ft at a rate of 2000 fpm |
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Can the cabin altitude be raised higher that 12,400 ft?
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Yes, by using manual mode
Cabin altitude will rise due to natural leak |
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In manual mode, will the cabin depressurize on landing?
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No
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What is the bleed system priority in flight?
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Onside engine
Opposite engine APU |
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If engine and APU bleed air are available, which has priority?
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APU if:
Aircraft is on the ground Wheel speed <50 kts Opposite engine bleed pressure is not enough for engine start |
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When will the crossbleed valve automatically open>
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Only one side bleed source is available
Engine 2 start in the air Engine 1 start in the air if APU is not available |
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What will close the ECS packs>
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Any engine start if APU is the bleed source
Engine start on the ground Respective bleed system duct leak Bleed air source not available TL set to MAX on takeoff REF A/I set to ALL on takeoff REF ECS set to OFF |
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When are ECS packs opened?
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TL not at MAX and:
500 ft AFE with both engines operating >9700 ft MSL with 1 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 recric fan deactivates Cargo outflow valve closes |
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Where does the CPCS get cruise flight level and landing elevation from?
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FMS before takeoff or CPCS calculates using ambient pressure
LFE may be manually inputted |
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What color is the LFE on the EICAS?
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Green if FMS input
Cyan if manual input |
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What is the ABORT mode?
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Cabin is scheduled back to takeoff altitude if:
Airplane stop climbing and begins a descent Airplane has not climbed >5000 AFE or >10000 MSL |
