Pneumatics Flashcards
What are the parts of the Air Management System (6)?
- Environmental Control System (ECS)
- Engine start
- Pressurization
- Wing and engine anti-ice
- Water pressure
- Hot air leak detection
The pressurization system consists of (5):
- Cabin outflow valve
- Static Pressure Port
- Negative Pressure Relief Valve
- Positive Pressure Relief Valve
- Cabin Pressure Controller
What provides air for the AMS (3)?
- Engline bleeds
- APU bleed
- External Pneumatic Source
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 (4)?
- ECS on the ground
- Engine start on the ground
- Assist with engine start (less than FL210)
- Bleed source for pressurization, heating and cooling below 15,000 feet
How many bleed regulating valves are in each engine?
2, one high stage and one engine bleed valve)
How would an APU or engine bleed button show a detected leak?
An amber light illuminates on the button.
What does the Overheat Detection System (ODS) observe (4)?
- Engine bleeds, packs
- APU bleed
- Plumbing for the wing and engine anti-ice system
- Trim air (rear cabin temperature control on certain delta aircraft)
How many ECS packs are on the aircraft? What provides air for the pack?
2 independent packs
Each engine provides bleed air to its respective pack
Can a single pack provide adequate temperature control and pressurization?
Yes, up to FL310.
What is the maximum altitude for single pack operation?
FL310
Where do the packs distribute air?
Pack 1- Flight deck/cabin
Pack 2- cabin
Can a single bleed source power both packs?
Yes, through the crossbleed valve.
How many recirculation fans do we have?
2
Which cargo bays have ventilation fans?
Forward Bay
What cargo compartments may we transport live animals? Why?
Forward, it has air recirculation.
What does pushing out the RECIRC button do?
Turns off both recirculation fans.
Can the APU bleed be used for anti ice?
No
What happens when XBLEED button on the panel is pushed out?
It manually closes the crossbleed valve.
What is the DUMP switch used for (3)?
- Emergency evacuation
- Fast cabin depessurization
- Smoke evacuation
What happens when the DUMP button is pressed?
- Sets ECS packs and recirculation fans to OFF.
- Outflow valve opens to climb cabin to 12,400 at a rate of 2,000 feet per minute.
- When cabin reaches 12,400, outflow valve is commanded closed.
With respect to the DUMP button, which functions are available in manual mode?
-Packs and recirc fans will turn off.
How can the outflow valve be modulated?
Manually or automatically.
Why does the DUMP button have a red-raised border around it?
So you can find it in low visibility conditions within the cockpit.
The MAN mode position allows manual control of:
Outflow valve
How can you determine the position of the outflow valve?
There is a pointer on the outflow valve position indicator on the environmental control system synoptic page on the MFD.
In Manual mode, will the cabin depressurize on landing?
No.
What are the DOWN/UP positions used for on the CABIN ALT selector knob?
Manually closes/opens the outflow valve to decrease/increase cabin altitude.
What is the LFE CTRL selector position on the pressurization MODE selector knob used for?
If not available from the FMS database, allows manual input of landing field elevation.
Is the pressurization system still in the AUTO mode when LFE is entered manually?
Yes
Where does the CPC get LFE?
FMS or manually selected.
How would you manually control the LFE?
Momentarily move the LFE selection knob UP or DOWN to change LFE in 100 foot increments
How is a manual input for LFE displayed on EICAS?
A cyan “M” in front of the altitude readout.
What does the ATTND position do on the PAX cabin knob?
Switches the cabin temperature control to the flight attendant control panels.
What is the memory item for Cabin Altitude HI?
OXYGEN MASKS……VERIFY…….. ON 100%
CREW COMM———————ESTABLISH
Where do the packs distribute air?
Pack 1: Flight deck/cabin
Pack 2: Cabin
Where is air used to cool the forward electronics bay taken from?
The flight deck
How many fans are in the aft electronics bay?
0
The gasper system provides air to:
Each pilot and passenger position
How does the flight attendant know if the temperature setting knob allows them to adjust the temperature?
An ENABLED LED on the flight attendant control panel turns on when the pilot selects the ATTND position in the cockpit
What keeps the three avionic E-Bays cool?
FWD and center: 3 fans each pull air from cabin to bay
AFT: Natural air flow from the cabin
Engine and APU bleed air are the only sources for the pneumatic system on the ground (T/F).
False
The engine bleeds, air conditioning ducts, APU bleed air distribution, and anti-ice supply have two overheat and leak detection loops. With both loops operational, both loops must detect a leak before an EICAS message is displayed (T/F).
True
Where is bleed air tapped from the engine?
6th and 10th stage compressors
Air from the pneumatic system provides:
ECS
Wing and engine anti-ice
Engine start
Water pressurization
Cruise altitude automatically updates in the MCDU on PERF INIT page 3 if cruise altitude is changed in flight (T/F).
False
Where does the Cabin Pressure Control System (CPCS) get Landing Field Elevation?
FMS or manual control on the pressurization panel
Will the DUMP button work when the pressurization switch is in manual mode?
No. However, the recirculation fans and packs will turn off
The MAN mode on the PRESSURIZATION MODE SELECTOR allows manual control of what?
Outflow valve
What color is LFE on the EICAS?
FMS- green
Manual- Cyan with a ‘M’ in front of the LFE
Where does the CPCS get cruise flight level and landing elevation?
FMS before takeoff OR
CPCS calculates it using ambient pressure OR
LFE may be manually input
At what cabin altitude does the CABIN ALTITUDE HI EICAS show?
9700
