Air (Pneumatics) Flashcards
1
Q
What is bleed air used for?
A
- ECS (heating & cooling)
- Engine start
- Engine and wing anti-icing
- Water pressurization
2
Q
What is external pneumatic air used for?
A
- ECS on the ground
- Engine start on the ground
3
Q
Where is the external ground source panel located?
A
- Lower fairing between the wings
4
Q
What is the Primary use for APU Bleed Air?
A
- ECS on the ground
- Engine starting on the ground
- Assist with engine start (< FL210)
- Bleed source for pressurization, heating,
and cooling (< 15,000 ft MSL)
5
Q
Can engine bleed air flow-back to the APU?
A
- No. A check valve prevents flow-back
6
Q
What is the Purpose of the Pre-cooler?
A
- Cools the bleed air coming from the engine to the AMS
7
Q
What does the Overheat Detection System (ODS) observe?
A
- Engine bleeds and packs
- APU bleed
- Plumbing for the wing and engine anti-icing system
8
Q
Is one Detection Loop capable of detecting an overheat condition?
A
- Yes (if one fails the other will work alone to detect the overheat)
9
Q
How many ECS packs are installed?
A
- 2 independent packs (left and right)
10
Q
Can a single ECS pack provide temperature control and pressurization?
A
- Yes, but limited to operations at or below FL310
11
Q
Can a single Bleed Source power both ECS Packs?
A
- Yes, through the Crossbleed valve
12
Q
When are the Recirculation Fans commanded off?
A
- Cockpit switch
- Smoke detected in the recirc bay
- DUMP button is pressed
- Respective pack is commanded off
13
Q
When is the Emergency Ram Air Ventilation activated?
A
- Both packs commanded or failed OFF below 25,000 feet (via left side and
electronically controlled) - Ram air pressure greater than cabin pressure (via right side)
