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Kalitta 747-400 Systems > Chapter 2 - Air Systems > Flashcards

Chapter 2 - Air Systems Flashcards

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

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2
Q

What controls the output temperature of all packs?

A

The zone requiring the coldest temperature

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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.

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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

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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

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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.

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7
Q

What unit in the bleed air system reduces bleed temperature?

A

Fan air precooler

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8
Q

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

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

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10
Q

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

A

• Thrust Reverse

• Nacelle Anti Ice

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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.

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12
Q

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

A

The secondary controller is automatically selected

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13
Q

Describe the AUTO position of the Cabin Altitude Selector?

A

Cabin altitude controller A or B selected automatically on alternate flights

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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.

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15
Q

When does the cabin rate limiter close both outflow valves?

A

When cablin altitude exceeds 11,000 FT

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16
Q

What is the max Cabin Altitude in cruise mode?

A

8000 FT

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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

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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

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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.

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20
Q

How many cabin altitude controlllers are provided?

A

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

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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)

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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

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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
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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
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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

Kalitta 747-400 Systems (18 decks)

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