ECS Questions Flashcards
What does the AMS use bleed air for?
- ECS (heating & Cooling)
- Engine start
- Pressurization
- Engine and wing anti-ice
- Water pressure
- Hot air leak detect
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
What provides air for the AMS?
- Engine bleeds
- APU bleed
- External pneumatic source
What is bleed air used for?
- ECS (heating & cooling)
- Engine start
- Engine and wing anti-icing
- Water pressurization
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
What is the primary use for APU bleed air?
- ECS on the ground
- Engine starting on the ground
- Electrical source
Can engine bleed air flow-back to the APU?
- No. A check valve prevents flow back
Where is bleed air tapped from the engine?
- 6th and 10th stage compressors (EBV and HSV respectively)
- System alternates between valves to regulates and adequate and safe pressure.
What is normal pressure for engine operation?
45 psi
What is the purpose of the pre-cooler?
Cools the bleed air coming from the engine to the AMS
What cools the pre-cooler?
- Ground N1 fan
- Flight N1 fan or ram air
What does the overheat detection system (ODS) observe?
- Engine bleeds and packs
- APU bleed
- Plumbing for the wing and engine anti-icing system
Do both loops have to function in order to detect on overheat condition?
- Yes, but if one fails the other will work alone to detect the overheat