B747 Air Systems Flashcards

1
Q

What is the temperature range for the MAIN DECK Temperature (TEMP) Selectors and the LOWER LOBE Temperature (TEMP) Selectors?

A

40°F to 85°F

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2
Q

With the EQUIP COOLING selector switch in NORM and the aircraft on the ground without the engines running and the outside air temperature (OAT) is less than 45 degrees F, what happens?

A

Heated air is exhausted to the Forward Lower Lobe via the Inboard Exhaust Valve

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3
Q

The Forward Equipment Cooling system provides cooling air for flight deck equipment and the Electrical and Electronic (E & E) compartment racks. The Aft Equipment Cooling system is what?

A

fully automatic

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4
Q

The AFT LOWER LOBE target temperature is displayed in magenta on the ECS synoptic when?

A

The LLCCAFR Switch is moved from OFF to the LOW AFT position

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5
Q

The AFT LOWER LOBE Temperature Selector is active when?

A

The LLCCAFR Switch is moved from OFF to the LOW AFT position

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6
Q

The FWD LOWER LOBE target temperature is displayed in magenta on the ECS synoptic when?

A

The LLCCAFR switch is moved from OFF to the LOW FWD position

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7
Q

The FWD LOWER LOBE Temperature Selector is active when?

A

The LLCCAFR Switch is moved from OFF to the LOW FWD position

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8
Q

The PACK SYS FAULT light illuminates for what?

A

Pack overheat or other system fault

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9
Q

The Zone SYS FAULT light illuminates if what?

A

A Zone Duct overheat is detected

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10
Q

The AFT CARGO HT Switch is normally selected OFF for engine start in order to do what?

A

Increase the amount of bleed air available for engine start

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11
Q

Under normal conditions, all three Packs will go to high flow when?

A

If the HI FLOW Switch is pressed ON during cruise and after engine start to cruise altitude

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12
Q

If one Pack is OFF, the other two Packs automatically go to high flow. Two packs in high flow do what?

A

burn less fuel than three Packs in normal flow

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13
Q

What indications would the crew see in the event of a cabin overpressurization?

A

Pack 2 shuts down and Cabin Differential pressure indication displayed on Primary EICAS in red

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14
Q

What is the temperature range for the Flight (FLT) DECK Temperature Selector?

A

65°F to 85°F (TEMP )

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15
Q

What conditions will cause the EQUIP COOLING system to go to closed loop operation?

A

Supply or Exhaust Fan failure,
Forward Lower Lobe temperature selected to less than 50 degrees F,
MAIN DECK CARGO FIRE Switch ARMED

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16
Q

Selecting the pack High Flow switch to ON in cruise would increase fuel burn by what amount?

A

.3% per pack

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17
Q

Why is the Aft Cargo Heat switch left OFF until the AFTER START flow?

A

To provide more airflow during engine start

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18
Q

The EQUIP COOLING Selector is in NORM, the aircraft is on the ground, engines not running, and Outside Air Temperature (OAT) is greater 45 degrees F, what happens?

A

Heated air is exhausted overboard via the Ground Exhaust Valve

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19
Q

On the ground, with the engines not operating, the Equipment Cooling selector in NORM, and the outside air temperature is 75° F, what is the position of the ground exhaust valve?

A

Open

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20
Q

In flight, with the Equipment Cooling selector in OVRD, what provides the air flow for equipment cooling?

A

Cabin differential pressure

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21
Q

Inflight, if the Lower Lobe Cargo Conditioned Air Flow Rate selector is in FWD LOW and the FWD LOWER LOBE Temperature selector is set to 45° F, what is the configuration of the Equipment Cooling system?

A

The inboard exhaust valve is closed and equipment cooling air is recirculated in a closed loop mode

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22
Q

When does the Equipment Cooling system configure for flight?

A

When one or more engines on each wing are operating

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23
Q

What does the advisory EICAS message “TEMP CARGO HEAT” indicate?

A

Overheat detected in aft cargo compartment when aft cargo heat system operating

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24
Q

What is the function of the positive and negative pressure relief valves?

A

Protect the fuselage against excessive pressure differential

25
Q

If cruise altitude is unavailable from the FMC in AUTO, the cabin altitude controllers assume what altitude?

A

39,000 feet

26
Q

The cabin altitude limiter closes both outflow valves if cabin altitude exceeds what altitude?

A

11,000 feet

27
Q

Why does the cabin altitude decrease to slightly below the FMC planned landing altitude in AUTO?

A

The slight altitude difference assures a small positive pressurization at touchdown

28
Q

With the PACK Control Selectors in NORM, Pack Controller A or B is selected:

A

Automatically on alternate flights

29
Q

What will cause the Bleed SYS FAULT light to illuminate?

A

Bleed air overheat, bleed air overpressure, High Pressure (HP) Valve or Pressure Regulating Valve (PRV) open when commanded closed

30
Q

How many temperature zones are there in the Freighter?

A

7

31
Q

How many Pack Temperature Controllers (PTC’s) are available?

A

2 identical PTCs, A and B

32
Q

Assuming the right duct has been isolated (right isolation switch off, 3 and 4 engine bleed switches closed), what bleed system functions are
not available?

A

3 and #4 Hydraulic System reservoir pressure, Right wing anti-ice, #4 Hydraulic Demand Pump, Right primary LE Flaps

33
Q

If the left or right duct section is isolated, why would the HYD PRESS DEMAND EICAS alert message display during approach if the respective hydraulic demand pump selector was left in AUTO?

A

Demand pump commanded to run and demand pump output pressure low

34
Q

If the left or right duct section is isolated, how are the respective leading edge flaps operated?

A

Electrically

35
Q

If the center duct section is isolated on the freighter, what components would no longer be available?

A

Master trim air, Aft cargo heat, Cargo Smoke Detection, Potable water pressurization, Lower Lobe Trim Air

36
Q

Assuming the #1 Engine Bleed Valve has been closed per the MEL and no abnormals are present, if the Nacelle Anti-ice is turned on for the #1
engine, which bleed system valve(s) open(s)?

A

1 PRV

37
Q

An Engine Bleed Air System (SYS) FAULT Light illuminated on the Bleed Air Overhead panel would indicate one of the following?

A

Bleed air overheat

38
Q

With engines running and no abnormals in the pneumatic system, if the #4 engine bleed switch is selected off, which bleed system valve(s) close?

A

4 engine bleed air valve; #4 PRV; #4 HP bleed valve

39
Q

During high power settings, air is supplied from which engine bleed section?

A

Intermediate pressure (IP) engine section

40
Q

Which system is inoperative if the Left or Right Bleed Duct section is isolated?

A

Leading Edge Flaps primary operation and Wing Anti-ice

41
Q

Which system is inoperative if the Center Bleed Duct section is isolated?

A

Freighter cargo smoke detection

42
Q

With the aircraft on the ground, moving the EQUIP COOLING Selector to STBY does what?

A

Configures the Equipment Cooling system for flight

43
Q

What is the normal position of the Left and Right Isolation Valves?

A

Both open

44
Q

The aircraft is on the ground, two or more PACKS are ON, one or more engines operating on each wing, LLCCAFR Switch OFF, what happens?

A

The Ground Exhaust Valve closes

45
Q

If an ENGINE BLEED Switch is selected OFF, what happens?

A

The Engine Bleed Air Valve, High Pressure (HP) Valve, and Pressure Regulating Valve (PRV) close. The PRV will reopen if Nacelle Anti-Ice or Reverse Thrust are selected

46
Q

Selecting the ENGINE BLEED Switch ON allows which of the following valves to open?

A

High Pressure (HP) Bleed Valve,
Pressure Regulating Valve (PRV),
Engine Bleed Air Valve

47
Q

Which of the following use engine bleed air for operation?

A

Thrust Reversers, Leading Edge Flaps, and Cargo Smoke Detection (Freighter)

48
Q

Negative Pressure Relief Valves are located where?

A

ide Cargo Door,
Forward Lower Lobe Cargo Door,
Aft Lower Lobe Cargo Door

49
Q

If cabin pressure becomes excessive what will happen?

A

One or both Positive Pressure Relief Valves open and Pack 2 shuts down to assist in relieving excess cabin pressure

50
Q

If the cabin altitude exceeds approximately 14000’, and the SUPRNMRY OXY Switch is in NORM what will happen?

A

Oxygen masks deploy, and EICAS advisory alert message “SUPRNMRY OXY ON” displays

51
Q

If the cabin altitude exceeds 11000’what will happen?

A

The Cabin Altitude Limiter closes both Outflow Valves

52
Q

If cabin altitude exceeds 10000’ what will happen?

A

EICAS warning alert message appears, MASTER WARNING lights illuminate,
warning siren aural sounds

53
Q

In Cabin Altitude Controller cruise mode, the maximum cabin altitude is normally what?

A

8000’

54
Q

Pressurization control is what?

A

fully automatic once route and cruise altitude are entered and executed

55
Q

Positioning the EQUIP COOLING Selector to OVRD does what?

A

Allows differential pressure to draw conditioned air across the E &E bays via the Smoke Override Valve

56
Q

In flight, with the Lower Lobe Cargo Conditioned Air Flow Rate selector in OFF, how is the forward Lower Lobe heated?

A

Heated air exhausted from the electrical and electronic (E & E) compartment heats the forward cargo compartment

57
Q

Which Bleed Duct section has overheat detection?

A

Right, Left and Center

58
Q

With the Lower Lobe Cargo Conditioned Air Flow Rate selector positioned in BOTH LOW, how many packs are in HIGH FLOW?

A

3