Chapter 2 - Air Systems Flashcards Preview

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Flashcards in Chapter 2 - Air Systems Deck (60)
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1
Q

What system or systems would be inoperative with both the left and right Isolation Valves closed?

A

• Trim Air

• Aft Cargo Heat

• Potable Water Head Pressure

• Cargo Smoke Detection

• Number 2 Pack

2
Q

What controls the output temperature of all packs?

A

The zone requiring the coldest temperature

3
Q

With the Lower Lobe Conditioned Airflow Rate Selector (LLCAFR) switch in the OFF position, what is the temperature range available with the Lower Lobe Temperature Selector?

A

The Lower Lobe Temperature Selector is inoperative with the LLCAFER switch in the OFF position.

4
Q

What determines when the packs will go to Normal Flow?

A

When the aircraft has arrived at the cruise altitude entered in the FMS

5
Q

What will illuminate the Engine Bleed Air System (SYS FAULT) light?

A

• Overheat

• Overpressure

• HP bleed valve OPEN when commanded CLOSED

• PRV OPEN when commanded CLOSED

6
Q

With the Engine Bleed Air (SYS FAULT) light illuminated, is reversing available on landing?

A

Yes, unless an overheat condition exists or the start valve is not closed.

7
Q

What unit in the bleed air system reduces bleed temperature?

A

Fan air precooler

8
Q

When the Engine Bleed Air Switch is selected off, what valves close?

A
  • PRV Valve
  • HP Valve
  • ​Engine Bleed Air Valve
9
Q

In an aircraft equipped with the NASI ECO system, what is the cockpit indication that the packs are in normal flow? What is indicated on the ECS Synoptic Page?

A

• The NORM legend in the ECO switch

• The ECS Synoptic Page indicates HI FLOW

10
Q

With the Engine Bleed Air Switch off, and no fault detected, what components are available?

A

• Thrust Reverse

• Nacelle Anti Ice

11
Q

What action would allow you to gain manual operation of the pressure system?

A

Turn on both Outflow Manual switches to ON.

All automatic cabin altitude control functions are bypassed.

12
Q

What happens if the primary controller selected by the cabin altitude selector switch fails?

A

The secondary controller is automatically selected

13
Q

Describe the AUTO position of the Cabin Altitude Selector?

A

Cabin altitude controller A or B selected automatically on alternate flights

14
Q

How can you gain manual control of the landing altitude if the airport for takoff or landing is not in the database?

A

By pushing the Landing Altitude (LDG ALT) switch on the overheard panel.

MAN (amber) displays on primary EICAS.

15
Q

When does the cabin rate limiter close both outflow valves?

A

When cablin altitude exceeds 11,000 FT

16
Q

What is the max Cabin Altitude in cruise mode?

A

8000 FT

17
Q

Does the cabin altitude continue to increase, or level off, if there is a planned level segment during the climb phase?

A

Continues to increase during the level segment

18
Q

How do the cabin altitude controllers calculate a cabin pressure schedule?

A

 They use ambient pressure, and
 Flight plan data from the FMC

19
Q

Can either outflow valve maintain cabin altitude and full ventilation?

A

YES

One pack is selected OFF to ensure cabin doors may be opened regardless of the position of the outflow valves if an emergency evacuation is required immediately after landing.

20
Q

How many cabin altitude controlllers are provided?

A

2 controllers, A and B. Each controller controls both outflow valves.

21
Q

What is the source of heat for the forward cargo compartment?

A

Heated air exhausted form the E and E compartment (equimpent cooling inboard exhaust valve open)

22
Q

Describe overheat protection of the aft cargo heat system?

A

An overheat thermal switch opens and closes an overheat/shutoff valve at higher temperatures

23
Q

If Trim Air is not available to the flight deck, upper deck, crew rest, and main deck distribution system, how is temp controlled in the cabin?

A
  • Backup modes control temp
  • If flight deck slector setting is available to the PTC, pack outlet temp is regulated to an average temp between 65F and 85F, as set by the flight deck
  • If flight deck temp selector setting is unavailable to the PTC, pack outlet is regulated to last flight deck temp
  • If last flight deck temp is unavailable to the PTC, then 75F (24C) average
24
Q

Under what conditions would trim air be unavailable to the flight deck, upper deck, crew rest, and main deck?

A
  • EICAS advisory TEMP ZONE is displayed
  • The center section of the bleed duct is isolated
  • EICAS advisory TRIM AIR OFF is displayed
  • The Master Trim Air switch is OFF
25
Q

What position of the LLCCAFR selector would result in all packs remaining in high flow during cruise?

A
  • FWD HI/AFT HI
  • BOTH LOW
26
Q

Explain the position of the LLCCAFR with the selector in the following positions:

  1. FWD LOW
  2. AFT LOW
  3. BOTH LOW
A
  1. 2/3 of pack 3 to FWD lower lobe
  2. 2/3 of pack 2 to AFT lower lobe
  3. 2/3 of pack 3 to FWD lower lobe and 2/3 of pack 2 to AFT lower lobe
27
Q

What zone and what pack is affected with the LLCCAFR selector in the following positions:

  1. FWD HI?
  2. AFT HI?
A
  1. All of pack 3 air is sent to foward lower cargo lobe
  2. All of pack 2 air is sent to the aft lower cargo lobe
28
Q

With the LLCCAFR switch OFF, what controls pack outlet temp?

A

The flight deck, upper deck, and crew rest zone requiring the coolest temperature.

29
Q

What is the function of the Lower Lobe Cargo Conditioned Air Flow Rate (LLCCAFR) selector?

A

Provides forward and aft lobe cargo air conditioning

30
Q

What are the seven temp zones?

A
  1. Flight deck
  2. Upper deck
  3. Crew Rest
  4. Forward Main Deck
  5. Aft Main Deck
  6. Forward Lower Cargo Lobe
  7. Aft Lower Cargo Lobe
31
Q

What happens if a pack temp controller detects a fault in a pack channel?

A

Control of the respective pack switches to the other PTC

32
Q

How can you restore pack operation for a failed PTC?

A

Push the Pack Reset Switch

33
Q

What would happen if a fault of an OVHT of the PTC is detected?

A

The respective pack valve closes, resulting in a pack shutdown.

34
Q
  1. How many pack temp controllers (PTC) are provided?
  2. How many separate channels are provided in the PTCs?
A
  1. Two: A and B
  2. Each PTC has 3 separate channels, one for each pack
35
Q

What target temp is a set to the Upper Deck and Crew Rest zones when electrical power is initially applied to the airplane?

A

75F (24C)

36
Q

What is the temp range with the main deck and forward and aft cargo lobe temp selectors in AUTO?

A

40F (4C) to 85F (29C)

37
Q

What does the Zone RST (SYS FAULT) light indicate?

A
  • Temp zone duct overheat or zone temp controller fault has occured
  • Master trim air valve failed closed
  • Trim air switch off
  • Master trim air valve closed and pack air continues to flow
38
Q

What valve are you controlling when you select MAN with the flight deck temp controller?

A

Flight deck trim air valve

39
Q

What is the flight deck temp range with the Flight Deck FLT temp selector in AUTO?

A

65F (18C) to 85F (29C)

40
Q

Under what conditions would High Pressure (HP) air would be used?

A

 Descent
 Other low power setting operations

41
Q

Under what conditions would Intermediate Pressure (IP) air be used?

A

High power setting operations.

42
Q

The Engine Bleed Air Switches control which valves by system logic, when
bleed air pressure is available?

A

 Engine bleed air valve
 PRV
 HP bleed valve

43
Q

Describe the general function of pressure regulating valve (PRV).

A

PRV limits bleed air pressure to prevent damage to ducting and equipment downstream

44
Q

Maximum altitude to utilize APU bleed air?

A

15,000 Feet

45
Q

APU Bleed air VALVE (amber) light?

A

APU bleed air isolation valve position disagrees with switch position.

46
Q

How would you isolate a bleed air duct section in the event of a bleed duct leak is detected?

A
  • Close the respective isolation valve
  • Close the engine bleed air valves.
47
Q

What does a bleed duct Isolation (ISLN) VALVE light indicate (amber)?

A

Isolation valve position disagrees with switch position

48
Q

With a left or right duct isolated, how would the leading edge flaps extend on the affected side?

What EICAS Advisory message would display?

A
  • The respective leading edge flaps will operate electrically in secondary mode.
  • FLAPS PRIMARY until LEF extended
49
Q

What does the SYS FAULT light on the PACK RST switch indicate?

A
  • Pack overheat or other system fault has occured
  • may illuminate briefly when automatically or manually swithcing from temp controller A to B or B to A
50
Q

What is the function of the AFT CARGO HEAT switch in ON position?

A
  • overheat shutoff valve opens to provide bleed air heat to aft and bulk cargo compartments
51
Q

What is inidcated by the Aft Cargo Temperature (TEMP) amber light?

A
  • compartment temperature excessive
  • overheat shutoff valve closes
  • inhibited on the ground and during climb
52
Q

The center duct provides air supply to what systems?

A
  1. Cargo smoke detection
  2. Potable water pressurization
  3. LLCCAFR Trim Air
  4. Trim Air
  5. Aft Cargo Heat
53
Q

What is the maximum cabin differential pressure?

A

9.4 PSI

54
Q

With the engine running and the Engine Bleed Air switch OFF, nacelle anti-ice is availble except when?

A

If the PRV has closed due to a malfunction

55
Q

Which position(s) of the Pack Control Selector allow the secondary pack controller to automatically assume control when the primary one fails?

A

Any position except OFF

56
Q

Overpressurization relief is provided by?

A

Two mechanical relief valves located on the left side of the fuselage

57
Q

What does pushing the ZONE Reset (RST) switch do?

A
  • resets zone temperature controller if fault no longer exists
  • reopens master trim air valve if duct overheat no longer exists
  • reopens forward or aft lower lobe cargo trim air shut off valve if duct overheat no longer exists
58
Q

What does pushing the TRIM AIR switch on do?

A
  • master trim air valve open and flight deck, upper deck, and main deck zone trim air valves operate automatically
  • automatic and manual selection of pack controller A or controller B enabled
59
Q

What does pushing the TRIM AIR switch OFF do?

A
  • master trim air valve closed
  • pack output temp in backup mode to provied average flight deck temp from 65F to 85F as selected by Flight Deck Temp selector in AUTO
  • cabin temperature panel control of upper deck zone temperatures inhibited
  • pack controller A selectd and both automatic and manual selction of pack controller B inhibited
60
Q

What does the Equipment (EQUIP) COOLING selector in OVRD do?

A
  • inboard exhaust valve closed
  • ground exhaust valve closed
  • eqpuiment supply valve closed; cooling air supplied through flight panes
  • smoke/override valve open; differential pressure exhausts cooling air overboard