AIR MANAGEMENT SYSTEM Flashcards
(45 cards)
AIR MANAGEMENT SYSTEM
Consists of:
AIR MANAGEMENT SYSTEM
Consists of:
Pneumatics – the air to be used
Environmental Control System (ECS) – regulates and distributes the air
Pressurization – maintains a safe cabin altitude
What does the AMS use bleed air for?
What does the AMS use bleed air for?
- ECS
- Engine Start
- Pressurization
- Engine and Wing A/I
- Water Pressure
- Hot Air Leak Detection
How many AMS controllers are installed?
What happens if a channel fails?
How many AMS controllers are installed?
One controller with 2 channels which control the respective onside system
What happens if a channel fails?
The remaining channel is able to control the entire AMS
Pneumatics Gets air from:
Pneumatics Gets air from:
Engines
APU
External air source
Where is bleed air tapped from the engines?
Where is bleed air tapped from the engines?
6th and 10th stage compressors (EBV and HSV respectively)
System alternates between valves to regulate an adequate and safe pressure
What is normal pressure for any engine operation?
What is normal pressure for any engine operation?
45 psi
Engines
Engines Provide bleed air from the 6th (Low) and 10th (High) stages of the compressor Pre-cooler cools incoming air Engine bleed used for: ECS (Environmental Control System) Anti-ice Water pressure Pressurization Engine start
Can engine bleed air flow-back to the APU?
Can engine bleed air flow-back to the APU?
No. A check valve prevents flow-back
What is the primary use for APU bleed air?
What is the primary use for APU bleed air?
ECS on the ground
Engine starting on the ground
Electrical source ( < FL330)
Assist with engine start (< FL210)
Bleed source for pressurization, heating, and cooling (< 15,000 ft. MSL)
APU bleed used for:
APU bleed used for: ECS (Environmental Control System) Water pressure Pressurization Engine start
What is the bleed system priority in flight?
Onside engine
Opposite side engine
APU (if available)
What is the bleed system priority in flight?
Onside engine
Opposite side engine
APU (if available)
If engine and APU bleed air are available simultaneously, which has priority?
If engine and APU bleed air are available simultaneously, which has priority?
APU has priority if
Aircraft is on the ground
Wheel speed < 50 knots
Opposite engine bleed pressure is not enough for engine start
What is the primary use for APU bleed air?
What is the primary use for APU bleed air?
• ECS on the ground
• Engine starting on the ground
• Electrical source
When will the crossbleed valve automatically open?
When will the crossbleed valve automatically open?
Only one side bleed source is available
Engine 2 start in the air
Engine 1 start in the air if APU is not available
What is external pneumatic air used for?
Where is the external ground source panel located?
What is external pneumatic air used for?
ECS on the ground
Engine start on the ground
Where is the external ground source panel located?
Lower fairing between the wings
External Air Sources
Air conditioning cart can be used to cool the aircraft’s cabin
High Pressure Air Start cart or air bottle can be used to start an aircraft’s engine
Both packs need to be turned OFF when starting with an external air source to prevent air contamination to the cockpit and cabin.
ENVIRONMENTAL CONTROL SYSTEM (ECS)
Two Packs (one located in each wing to fuselage fairing)
ENVIRONMENTAL CONTROL SYSTEM (ECS)
Two Packs (one located in each wing to fuselage fairing)
Engine 1 provides air for pack 1
Engine 2 provides air for pack 2
Incoming air temperature is set via temperature control knobs in the cockpit or the cabin can be controlled by the Flight Attendant via a temperature control knob on the Flight Attendant’s forward galley
control panel.
A single pack can provide air for the entire ECS to a maximum altitude of FL310
How many ECS packs are on the airplane? What provides air for the packs?
Can a single bleed source power both packs?
How many ECS packs are on the airplane? What provides air for the packs?
2 independent packs (Pack 1 and Pack 2)
Each engine provides bleed air to its respective pack
Yes, up to FL310
Can a single bleed source power both packs?
Yes, through the crossbleed valve
ENVIRONMENTAL CONTROL SYSTEM (ECS)
Recirc Fans
Recirc Fans
Help reduce the load on the packs by recirculating the already-conditioned air and remixing it with incoming cabin/cockpit air
Provide 52% fresh air to 48% recirculated air
Fans will not work when: The DUMP Button is pressed When are the recirculation fans commanded off Cockpit switch Smoke detected in the recirc bay DUMP button is pressed Respective pack is commanded off
What are some things that will close the ECS packs?
What are some things that will close the ECS packs?
Any engine start if APU is the bleed source
Engine 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)
When are ECS packs recovered?
When are ECS packs recovered?
Thrust levers not at Max for all conditions.
TWO ENGINES
the airplane is 500 ft above takeoff field altitude
ONE ENGINE
the airplane is above 9,700 ft during go around
above 9,700 ft, for takeoff fields at 8,000 ft or below
above 15,000 ft, for takeoff fields above 8,000 ft
Gasper Ventilation
Gasper Ventilation
Provides personal air to each pilot and passenger positions
Supplied by air from the right recirc fan
At what temp does the Gasper SOV open?
At what temp does the Gasper SOV open?
At 35 ̊ C or 95F the Gasper SOV Opens directing Recirc Fan #2
Air directly into Gasper Manifold
Provides personal air to each pilot and passenger
Supplied by air from right record fan
Electronic Compartment Ventilation
What keeps the 3 avionic E-BAYs cool?
Electronic Compartment Ventilation
Forward, central, and aft electronic bays are ventilated with conditioned air from the cabin and expelled overboard
What keeps the 3 avionic E-BAYs cool?
FWD & CTR E-BAY 3 fans each pull air from cabin to bay AFT E-BAY Natural air-flow from cabin to bay
