Air Management System Flashcards
Will the APU bleed open if there is left engine bleed air?
NO
The engine bleed air will automatically shut down by closing the engine bleeds when… ?
Bleed Air Leak
Overpressure
Failed Condition
What obscure system is the bleed air used for?
Water Pressurization
Will the engine bleed valves open if there is a fire detected?
NO
Will the engine bleed valves open if there is a leak detected?
NO
Will the cross bleed valve open with the APU bleed ON and engine #1 start in the air?
NO… for engine #1 start in the air
The APU bleed must be OFF for the cross bleed valve to open
If the cross bleed valve fails open what happens?
Engine bleed #1 will close if there is bleed air available from #2
If there is a bleed leak, will the cross bleed valve open?
NO… unless starting an engine
What are the conditions for the RAM air valve to open?
Both packs are commanded OFF
Aircraft altitude less than 25,000
Does the negative pressure relief valve require power to operate?
NO electrical power is needed… it is spring loaded.
When does the negative pressure relief valve open?
-.5 psi
When does the positive pressure relief valve open?
8.77
What is the nominal differential pressure if cruise flight is set below FL370?
7.8 psi
What is the nominal differential pressure if the cruise is set at or above FL 370
8.34 psi
Pushing the DUMP button accomplishes what?
Sets the packs and recirculation fans to OFF
Controls the outflow valve to maintain 2000
fpm up to a cabin altitude of 12,400
When cabin altitude reaches 12,400, outflow valves close.
Is the Dump function available in manual mode?
NO… there is no DUMP function in manual mode. HOWEVER, the packs and recirculation fans are still shutdown.
Will the automatic cabin depressurization work in manual mode?
NO
When is the DUMP function used
Evacuation
Smoke Removal
Fast cabin depressurization
For rapid cabin depressurization or smoke removal what can be done?
Push the DUMP button on the PRESSURIZATION PANEL
What is the memory item for smoke evacuation?
O2 Masks ON - EMERGENCY
ESTABLISH COMMUNICATIONS
PRESSURIZATION DUMP - PUSH IN
The AMS gives priority to the APU bleed on the ground below what speed?
50 KTS
What happens if ground speed exceeds 50 KTS on the ground with the APU bleed on and taxiing on the left engine only?
The bleeds will be transferred to the left engine and it will provide bleed air
What is the approximate ration of fresh vs mixed air?
52% Fresh 48 % Mixed Recirculated Air
Which cargo compartment can animals be carried?
Forward Cargo ONLY
The EMERGENCY RAM AIR valve will only open under what conditions?
Only if both ECS packs are commanded OFF or failed OFF and the aircraft altitude is less than 25,000
More to follow regarding…
Ram Air Emergency Ventilation
What does the AMS controller do??
Provides primary control for the bleed air sub systems: bleed control air conditioning hot air leak detection crew O2 monitoring wing and engine ice protection
How many AMS controller channels are there?
2
What does pushing in of the PACK 1 push button on the AIR CONDITIONING / PNEUMATIC panel accomplish
Manually closes the pack flow control valve
Pushed in allows automatic operation by the AMS
What does the RECIRCULATION button on the AIR CONDITIONING / PNEUMATIC panel do?
turns off BOTH recirculation fans
If all the buttons are dark and pushed in on the AIR CONDITIONING / PNEUMATIC panel, what is taking place
Normal function of the AMS allowing automatic operation of the AMS
On the AIR CONDITIONING / PNEUMATIC panel, what does pushing out of the BLEED buttons accomplish?
Closes the respective Bleed Valves
If the DUMP valve is pressed, how is the system returned to normal?
Pushing the DUMP button a second time returns the system to normal
What is the DUMP button for?
For rapid cabin depressurization
What does the DUMP button do?
opens the outflow valve and commanding the packs and recirculation fans to off
The LFE can only be adjusted under what conditions
If the MODE Selector knob is in LFE
commands changes in 100 foot increments
When would the CABIN ALTITUDE INDICATION on the EICAS indicate GREEN, AMBER, and RED
Green normal range
Amber cautionary range
Red warning range:
On the ECS synoptic page what does the OFV at the top right corner indicate?
Out Flow Valve indication.
It is actual position of the outflow valve
If there is no arrow at the OFV indicator, what is the condition?
If the signal is invalid, the pointer is removed
On the ECS page what does a AMBER flow line represent?
an Overheat condition
Explain what transpires between low pressure and high pressure engine bleed sources
The AMS controller automatically selects between low and high pressure air. That is the reason we must be careful when advancing the throttle during engine start. As a result the AMS controller might select low pressure air thus losing the pressure required for engine start.
If there is a bleed leak, overpressure or fail condition, what does the controller do?
It shuts down the bleed air system by closing the engine bleed valve.
If anti ice is selected while the APU is providing bleed air, what does the AMS controller do?
It shuts the APU bleed valve
Where are the Overheat Detection Zones?
APU Bleed
Slat anti-ice supply ducts
Bleed system ducts and air conditioning ducts
Can the APU be used for anti-ice?
NO
Explain the Cabin Warm Up Mode
… ??? ….
What procedure is used to avoid fog in the cockpit?
Recirculation Fans to OFF
The Recirculation Fans are commanded OFF
Both Pack Off Cabin warm up mode with the APU on Cargo bay fire signal Dump button pressed Smoke is detected in the Recirculation Bay
The Forward Electronic bay has how many fans?
3 fans
How many fans does the Center Electronic Bay have?
3 fans
How may fans does the Aft Electronic Bay have?
No fans due to air flowing from the cabin
If a fire is detected in the forward cargo bay…
The SOV is closed and the fan is turned off, thus preventing HALON from entering the cabin.
Emergency Ram Air Ventilation is commanded open when?
If BOTH packs are failed or commanded OFF and the aircraft altitude is less than FL250
During smoke removal, when is the Ram Air Ventilation Valve commanded OPEN??
When the the DUMP valve is pressed as both ECS packs are commanded OFF
What are the RAIDs?
Ram Air Inlet Door
What do the RAIDs do??
They modulate to optimize the quantity of ram air sent through the packs, thus decreasing drag and fuel consumption.
The RAIDS are full open when??
On the ground until reaching 17,500 ft Airplane is below 17,500 on descent Pressure DUMP Button is activated RAT deployed Anti-Ice System is activated
What does the EICAS message RAM AIR FAULT indicate?
In flight a RAID failure when it is more than 10% open only after landing. On the ground when the RAID failure of more than 10% open.
What does the EICAS message PACK 1/2 FAIL indicate?
a RAID failure in flight when it is more than 90% closed.
What is happening on the ground when BOTH EICAS messages PACK 1/2 FIL and RAM AIR FAULT are present?
A RAID failure when it is more than 90% closed
The FADEC may send an ECS OFF signal to the AMS controller… under what circumstances does the controller disregard the signal?
Above 15,000
The ECS OFF signal closes the Packs during takeoff under what conditions?
One engine inop and APU bleed is unavailable
Thrust levers set to MAX and the APU bleed is unavailable
T/O DATASET REF ECS set to OFF and the APU bleed is unavailable
T/O DATASET REF ECS set to OFF and A/I set to ALL
The ECS OFF signal closes both Packs during go around under what circumstances?
One engine inop and APU bleed is unavailable
Thrust levers set to MAX and APU bleed is unavailable
Thrust levers set to MAX and Wing Ice Protection is ON
The Packs are commanded ON under what circumstances
Thrust lever reduction below TO/GA
Takeoff with 2 engines operating above 500 AGL
Aircraft is above 9700 for takeoff field elevation below 8000 and one engine inop
Aircraft is above 15,000 for takeoff field elevation above 8000 ft and one engine inop
Aircraft is above 9700 ft during go around incase one engine inop
How many cabin outflow valves are there?
ONE
How many channels does the Cabin Pressure Controller have?
Two fully independent automatic channels
In manual pressurization mode, what is the default altitude if no input is made?
8000 ft
When must LFE be manually set?
If not available from the FMS data base?
What does the EICAS WARNING message CABIN ALTITUDE HIGH indicate?
Cabin altitude is above 9700 ft
almost complete
CPCM modes still to review… ie flight abort mode, taxi mode, etc.
What happens when the DUMP guarded push button is pressed?
Provides rapid cabin depressurization by opening the outflow valve, commanding the packs and recirc fans to shutoff.
If a bleed leak is detected what happens to the engine bleed valve?
It closes
What are the conditions that the AMS controller will automatically close the engine bleed valve?
Overpressure
Bleed Leak
Fail condition
If there is a right bleed air leak, will the APU bleed valve open?
YES as it can be isolated by the XBLEED valve
If there is left engine bleed, will the APU bleed valve open?
NO
When does the XBLEED valve open?
When there is bleed air from one side only
APU BLEED pushbutton is pushed out for main engine start
Engine Start #2 in the air
Engine Start #1 in the air with the APU bleed off
No Bleed Leak, unless starting an engine
If the is a bleed leak detected, will the XBLEED VALVE OPEN?
NO… unless using it for engine start; then YES
If the XBLEED fails open what happens to the engine bleed valves?
Engine Bleed #1 will be commanded closed if the XBLEED valve fails open
When does the AMS command the APU bleed to close when the APU is operating?
When above 50 kts on takeoff
When is the slat anti ice available?
Above 40 kts on takeoff
When is an unpressurized takeoff automatically commanded by the AMS
ECS OFF with APU bleed OFF
ECS OFF - ENG REF AI ALL - APU ON or OFF
If both packs are commanded OFF, what happens?
Both Recirculation fans are turned off
When are the Recirculation fans turned by the AMS controller?
Both packs are commanded OFF Ground Warm UP Mode Cargo Bay Fire Dump Button is pressed Smoke detected in recirculation bay
What are the pressurization modes?
Ground Mode Taxi Mode Takeoff Mode Climb Mode Cruise Mode Descent Mode Abort Mode
