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E-175; Systems > Air Management System > Flashcards

Air Management System Flashcards

1
Q

When does the engine bleed valve open? (4)

A

Respective bleed switch is set to auto, respective engine bleed is available, no fire is detected in respective engine, no bleed duct leak is detected

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2
Q

What does the APU bleed valve do and when does it automatically open? (5)

A

Controls the APU bleed air to the pneumatic system. Opens when: APU switch set to AUTO, APU bleed is available, no APU and left bleed duct leak, left engine bleed is unavailable, wing & anti-ice system not requested.

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3
Q

When does the cross bleed (XBLEED) automatically open? (5)

A

When it’s set to AUTO, and there’s a bleed air source available on one side but not on the other, BLEED APU pushed out for main engine start, engine #2 start in air, APU bleed off and engine #1 start in the air.

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4
Q

What does pack 1 do? Pack 2? Single pack?

A

1: adjusts airflow to control flight deck temperature. 2: adjusts airflow to control passenger cabin temperature. Single pack: both zones will receive air through the mixer.

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5
Q

Single PACK ops max altitude?

A

31,000 ft

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6
Q

What do the PACKs provide? (3)

A

Cabin heating, air conditioning, pressurization.

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7
Q

What does Ram Air ventilation do? When is emergency Ram Air ventilation automatically activated?

A

Provides emergency ventilation in case of: pack shutdown/smoke removal. Ram air valves are automatically commanded open if both packs are OFF below 25,000 ft. Also, includes a check valve that only allows ram air into the cabin when: ram air pressure is greater than cabin pressure.

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8
Q

What does the Ram Air Inlet Door (RAID) do?

A

Modulates and optimizes the amount of ram air sent to the PACKs through changes in door position.

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9
Q

What does the Cabin Pressure Control System (CPCS) consist of? (5)

A

Cabin pressure controller, cabin outflow valve, negative pressure relief valve, positive pressure relief valve, static pressure port.

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10
Q

What does the cabin pressure controller (cpc) do?

A

Controls cabin pressure by commanding OFV to modulate airflow through the valve from the pressurized airplane volume to the surrounding environment.

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11
Q

What does the Outflow Valve (OFV) do?

A

Controls airflow from the cabin into surrounding environment. This controls pressurization.

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12
Q

What does the Negative Pressure Relief Valve (NPRV) do? When does it open?

A

Protects airplane structure against damages due to a negative differential pressure. Opens if differential pressure between cabin and surrounding environment exceeds -0.5 psi.

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13
Q

What does the Positive Pressure Relief Valve (safety valve) do? When does it open?

A

Protects planes structure against damages due to positive overpressure. If OFV fails, the safety valve opens if the pressure differential between cabin and surrounding environment exceeds 8.6 psi.

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14
Q

What are the two differential pressures provided by the CPCS?

A

Cruise flight below 37,000 ft: 7.8 psi. Cruise flight above 37,000 ft: up to 8.4 psi.

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15
Q

What does the dump function do? (3)

A

Dumps pressure in case of Emergency evacuation, smoke removal or for fast cabin depressurization.

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16
Q

What does hitting DUMP do? What happens if it is pressed a second time?

A

Provides rapid depressurization by (3): opening OFV (commands a 2000FPM climb to 12,400 ft cabin altitude, then OFV closes), commanding PACKs OFF, commanding recirc fans OFF. The system returns to normal (dump sequence stopped).

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17
Q

What are the two external air connections?

A

HP (high pressure): engine starting; used if APU is inoperative. LP (low pressure): for cabin heating and cooling.

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18
Q

What does the CABIN ALT KNOB do and how does it work? Down/stop/up

A

Controls position of the OFV. Down: OFV moved to close (cabin altitude trends down, increases pressure in cabin). Up: OFV moved to open (cabin altitude trends up, decreases pressure in cabin).

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19
Q

How does the PRESSURIZATION MODE knob work? AUTO/LFE CTRL/MAN

A

Auto: LFE set on destination in flight plan. LFE CTRL: automatically controls pressurization throughout flight, LFE is set manually using LFE CTRL knob. MAN: manually controls position of OFV through CABIN ALT knob.

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20
Q

How does the MASKS DEPLOY knob work? OFF/AUTO/OVRD

A

OFF turns the system off duh. AUTO: deploys 02 masks when cabin altitude reaches 14,000 ft to 14,750 ft

21
Q

Bleed air tapped from the engines from the…

A

6th and 10th stage compressors. The system alternates between valves to regulate an adequate and safe pressure.

22
Q

How many AMS controllers are installed?

A

One controller with two channels.

23
Q

What provides air for the AMS? (3)

A

Engines, APU, external pneumatic.

24
Q

The ENGINES can supply bleed air for? (4)

A

ECS, Engine Starts, Anti-Ice, Water Pressurization.

25
Q

What is External Pneumatic Air used for? (2)

A

Engine Starts (on the ground), ECS (on the ground).

26
Q

Where is the External Pneumatic ground source panel located?

A

Lower faring, between the wings.

27
Q

The APU can supply bleed air for? (3)

A

ECS, up to 15,000 ft, Engine start, up to 21,000 ft, Water Pressurization. (Note: the APU cannot supply the Anti Icing System)

28
Q

Can engine bleed air flow back to the APU?

A

No. A check valve prevents flow back

29
Q

What is normal duct pressure for any engine operation?

A

45 psi.

30
Q

What is the ratio of fresh air to recirculated air?

A

52% fresh air to 48% recycled air.

31
Q

How many channels on the Cabin Pressure Control (CPC)?

A

2 channels, 1 active, 1 in standby.

32
Q

In manual mode, will the cabin depressurize on the landing?

A

No.

33
Q

What is ABORT mode?

A

If you haven’t reached >5000 feet AFE or >10,000 feet MSL and begin a descent, LFE is scheduled back to departure elevation.

34
Q

The CKPT temp control knob requires ___ for operation. The PAX CABIN temp control knob requires ____ for operation.

A

PACK 1. PACK 2.

35
Q

When will the recirculation fans turn ON with the switch in AUTO?

A

When at least one PACK is operating (unless cargo or recirculation bay smoke is detected).

36
Q

When will the PACKs automatically turn off? (2)

A

During engine start, Associated bleed system duct leak is detected.

37
Q

When will an Engine Bleed Valve automatically close? (4)

A

Engine Fire, Bleed Duct Leak, Overpressure on respective engine, Bleed Valve Failure (fails closed).

38
Q

When will the APU Bleed automatically close? (4)

A

APU Fire, APU or Left Bleed Duct leak detected, Anti-Icing system in ON, Left Engine Bleed is ON (in most cases, engine bleed has priority over APU bleed air).

39
Q

When would you select the Pressurization mode switch to LFE CTRL? Where do you look as your trying to set the LFE (landing field elevation) manually?

A

When your landing at an airport not in the FMS database. EICAS. LFE will be shown in cyan with an M before it (manual)

40
Q

When would you need to be concerned with the max cabin differential pressure limitations of 7.8 and 8.4?

A

When operating the pressurization system in the Manual Mode!

41
Q

Max differential pressure?

A

8.4 psi.

42
Q

Max differential overpressure?

A

8.8 psi.

43
Q

Max differential negative pressure?

A

-0.5 psi.

44
Q

Max differential pressure for T/O and landing?

A

0.2 psi.

45
Q

What types of oxygen will the quick-dawning cockpit crew masks provide?

A

Emergency = pure oxygen with positive pressure, 100% = pure oxygen on demand, Normal = oxygen/ambient air mixture (ratio depends on cabin altitude)

46
Q

During the pre-flight walk around, how would you know if the cockpit crew O2 has been over pressurized?

A

The green blowout disc would be missing on the forward right side of the fuselage.

47
Q

How long do the Pax O2 Generators last?

A

12 minutes.

48
Q

How long does the PBE last? What color are you looking for on the pre-flight?

A

15 minutes, Blue indication=Good, Pink=Bad.

49
Q

Does the DUMP button work when the pressurization system is in MAN mode?

A

No. It works in AUTO mode only.

E-175; Systems (15 decks)

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