AIR MANAGEMENT SYSTEM

Question 1

AMS System division

Answer 1

The Pneumatic
The Environmental control system
The Cabin Pressure Control System

Question 2

AMS CONNECTION

Answer 2

Is connected to the SPDA2 providing primary control for various aircraft subsystems.
*bleed control
*environmental control
*hot air leak detection
*crew oxygen monitoring
Wing and engine ice protection

Also interfaces with the smoke detector and the recirculation bay and provides :
* faul detection
*isolation
*reporting

Question 3

How is it controlled

Answer 3

Through 2 channels through which it controls the respective systems. In case of a channel fault the other is capable to control the entire pneumatic, air conditioning and anti ice systems.
It is controlled through PRESSURIZATION & AIRCOND/PNEUMATIC overhead panels

Question 4

Where can we see indications

Answer 4

On EICAS and MFD (systems page)

Question 5

Which are the sources

Answer 5

*Engine bleed air (is the main source)
*APU bleed air
*External pneumatic source

Question 6

The pneumatic system provides

Answer 6

Regulated bleed air to
The engine starter
The anti ice system
The environmental control system
For water pressurization

Question 7

How to regulate the power changes

Answer 7

By taking bleed air from LP compressor stage (stage 6) and HP compressor stage (stage 10).

Question 8

Valves

Answer 8

Low stage bleed check valve prevents from high pressure into the engine Low pressure supply port
High stage bleed valve regulates pressure at low power settings
Engine bleed valve regulates bleed air pressure at high power settings.

Question 9

How is temperature regulated

Answer 9

Temperature is regulated by the Pre-cooler to a predetermined value.
On ground—> cools hot bleed air by fan air
In flight —> Ram Air or Fan Air

Question 10

Push button philosophy

Answer 10

When Pushed in NO LIGHT and bleed air is automatically controlled
When Pushed In LIGHT BAR the bleed air is manually closed

Question 11

APU

Answer 11

Though is capable of supplying constant bleed air to the pneumatic system in flight and on ground it is used primarily for engine starting and the ground pneumatic source for the Environmental Control System.

Question 12

When are ECS packs are closed?

Answer 12

If any of the below occurs:

• a bleed source is not available for the pack
  *the respective Pack button is OFF
  *any engine is starting and Weight-On-Wheels is true
  *the respective engine is starting, Weight-On-Wheels is false and the opposite engine is not starting
  *any engine is starting and the APU is the bleed source
  *respective bleed system duct leak
  *respective packs BIT shutdown failures are present (PACKS 1(2) FAIL EICAS message displayed
  *

Question 13

When are the ESC packs are recovered?

Answer 13

When Thrust levers are NOT to MAX and any of the below occurs:

*thrust lever reduction
*the airplane is 500ft above TO fiels altitude (for TO with two engines operating)
*the airplane above 9700ft (for TO fields at 8000ft or below and OEI)
*the airplane above 1500ft (for TO fields above 8000ft and OEI)
*the airplane is above 9700ft during Go Around ( for OEI)

Question 14

Where is the Bleed air used for ?

Answer 14

Engine start
Water Pressurization
Environmental Control System (ECS)
Engine & Wing A/I

Question 15

Which conditions need to exist simultaneously so that the APU BLEED valve is open?

Answer 15

• APU switch to AUTO
• APU BLEED is available
• No APU & Left bleed duct leak
• Left engine bleed is unavailable
• Wing A/I system not requested (or Wing A/I system requested ON and Wing A/I system is failed.

Question 16

When is Engine Bleed Valve commanded open?

Answer 16

When simultaneously:
- Respective bleed switch is set to AUTO
- Respective engine bleed is available
- No fire is detected in the respective engine
- No bleed duct leak is detected