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787 > Air System > Flashcards

Air System Flashcards

1
Q

What is the wind speed at which entry and cargo doors should not be operated

A

40 kts at the door

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2
Q

At what wind speed should the doors be closed

A

65 kts

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3
Q

How many portable oxygen cylinders are installed in the aircraft 787-900

A

19

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4
Q

Fwd equipment COOLING switch off

A

both forward equipment cooling supply fans
flight deck supply fan and vent fan are commanded off
smoke/override valve and flight deck isolation valve are commanded open forward cargo heat becomes inoperative
OVRD illuminates

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5
Q

Fwd equipment cooling OVERRIDE MODE

A

off is selected manually, or
both forward equipment cooling supply fans fail, or the smoke/override mode is automatically selected by the smoke detection system

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6
Q

Turning the flight deck temperature control toward C or W sets the desired temperature between

A

18° C and 29° C. Mid position (12 o’clock) sets approximately 24° C

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7
Q

PACK Switches Off (AUTO not visible)

A

CAC’s are commanded off.

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8
Q

PACK SWITCHES OFF ( illuminated amber)

A

both associated CAC’s are not running:
• automatically during engine start, or
• automatically due to a pack or compressor outlet high temperature, or
• OFF is manually selected

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9
Q

TRIM AIR Switches ON

A

the trim air valve is commanded open.

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10
Q

TRIM AIR switches Off (ON not visible) –

A

the trim air valve is commanded closed, and • FAULT illuminates

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11
Q

Trim air FAULT illuminated (amber)

A

the trim air valve is failed closed, or • the trim air valve is commanded closed because of a zone supply duct overheat, or • the TRIM AIR switch is selected off

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12
Q

if either the upper or lower switches are placed in the off position then

A

An EICAS advisory message RECIRC FAN UPR and/or LWR OFF is displayed

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13
Q

Aft Equipment Cooling (EQUIP COOLING AFT) SwitchOff (AUTO not visible) –

A

• both aft equipment cooling supply fans and vent fan are commanded off • override valve is commanded open • aft cargo heat becomes inoperative • OVRD illuminates

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14
Q

Aft Equipment Cooling (EQUIP COOLING AFT) Switch–OVRD (illuminated amber)

A

– SMOKE/OVRD mode is operating because: • off is selected manually • both equipment cooling supply fans fail, or • smoke/override mode is automatically selected by the smoke detection system

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15
Q

Cabin Temperature (CABIN TEMP) Control

A

Turning the control toward C or W sets the passenger cabin master reference temperature between 18° C and 29° C.

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16
Q

Air Conditioning Reset (AIR COND RESET) Switch

A

Push – • resets any air conditioning faults and attempts to restart normal operation • resets any trim air valves held closed due to overheat, control failure, or valve failure • attempts to reset a failed recirculation fan • resets fault protection

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17
Q

Alternate Ventilation (VENTILATION) Switch ALTN AMBER

A

9V-OJA - 9V-OJF ALTN (illuminated amber) - the Forward and Aft Outflow Valves are automatically repositioned towards the ten and one o’clock positions respectively when airplane is below 13,000 ft altitude and not on ground. The Alternate Ventilation System (AVS) provides an alternate means of ventilating the cabin and flight deck in the event both packs are inoperative. The system uses both the FWD and AFT outflow valves. When the airplane is
un-pressurized, placing the alternate ventilation system switch in ALTN positions the FWD and AFT outflow valves toward the ten and one o’clock positions respectively, allowing fresh outside air to be drawn into the air distribution system.

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18
Q

SHOULDER heater is Available in-flight only true or false

A

True

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19
Q

When IS the FOOT HEATER AVAILABLE ?

A

Available on ground and in-flight when pack and recirculation fans are on.

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20
Q

Liquid quantity display PECS

A

Liquid Quantity Display

QTY – • displays the left and right system reservoir quantities as a percentage of the normal service level (1.00 is the normal service level) • LO (amber) – displayed when the reservoir requires servicing • RF (white) – displayed when reservoir servicing is recommended • OF (white) – displayed when the reservoir is over–full

Note: A single liquid cooling loop is displayed when only one forward external power source is connected and selected ON.

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21
Q

How many temperature zones are there on 787

A

The airplane is divided into seven temperature zones: the flight deck and six passenger cabin zones.

Note: Zones A and B contain sub-zones A1 and B1 that are not depicted on the air synoptic.

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22
Q

When does the CAC inlet door deflects

A

During normal ground operations and landing phases of flight, deflector doors deploy in front of the CAC inlets to prevent debris from entering the CACs. These deflector doors may retract on the ground when ambient air temperature is below 2°C or above 35°C.

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23
Q

How many CAC are needed for its associated PACK ?

A

single CAC provides sufficient air to operate its associated pack in all operating modes.

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24
Q

How many pack control modes are there

A

Packs are controlled by two identical pack control systems. If one system fails, pack control automatically switches to the other system.

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25
Q

Pack ground operations how does the ram fan works and when

A

Pack Ground Operation

Both air conditioning packs are normally selected to AUTO for ground operations. Each pack uses a ram fan to draw air through the ram air system for ground operation cooling when sufficient main A/C Bus power is available.

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26
Q

On ground how many CAC s operate when APU IS THE ONLY power source. Is there any exception ?

A

Normally, to maximize system efficiency, only one CAC on each side runs when using the APU as the power source. During cold weather operations both CACs are commanded on.

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27
Q

For normal engine starts what happens to the CAC and the associated PACK eicas ?

A

All CACs are commanded off during initial start sequence with corresponding PACK L and PACK R messages inhibited.

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28
Q

When does the packs restart after engine start, what if both engines are started together

A

Packs do not restart until at least two minutes after 1) the engine start sequence is initiated and
2) the engine is running.

If both engines are started together, and the two minute limit is met, packs restart immediately after the second engine is running.

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29
Q

A ground source of conditioned air may be used to supply conditioned air directly to the —————————–, eliminating the need for pack operation.

A

cabin distribution system

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30
Q

What happens If an overheat or other significant pack fault is detected

A

the pack shuts down automatically and the EICAS advisory message PACK (L, R) is displayed

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31
Q

How can PACK operation be restored after a fault

A

An attempt to restore pack operation may be made by pressing the AIR CONDITIONING RESET switch.

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32
Q

For an in-flight starter assisted engine start, what happens to the CAC

A

only one CAC runs to maintain pack operation and maximize power available for the engine cross start

33
Q

During a go-around with one engine inoperative, when can the pack l+ r message show momentarily. Is there any crew action ?

A

if slat autogap is needed, both packs could temporarily load shed and the PACK L+R message may show momentarily. No crew action is required for the PACK L+R message in this condition

34
Q

For certain internal malfunctions, pack control automatically uses ______________as a backup to normal mode. what is the EICAS advisory message and where else can it be displayed

A 
standby cooling mode 
PACK MODE (L, R) is displayed, and STBY COOLING is displayed in amber on the AIR synoptic.
35
Q

What happens If one pack is in standby cooling and the other pack is operating normally

A

the pack in standby cooling mode shuts down at lower altitudes and higher outside air temperatures when ambient conditions do not permit standby cooling. The pack restarts automatically when altitude and outside air temperatures are suitable for standby cooling

36
Q

What happens in standby cooling mode to the flight deck and cabin temperature

A

In standby cooling mode, pack cooling capacity may be less than in normal mode and may result in warm flight deck or cabin temperatures at lower altitudes

37
Q

The flight deck receives 100% conditioned outside air true or false

A

yes, The flight deck receives 100% conditioned outside air

38
Q

when may the flight deck receive recirculates air ?

A

Some recirculated air is supplied

to the flight deck if one pack is off and its associated lower recirculation fan is on.

39
Q

Outside air flow is reduced during failure conditions and electrical load shed
conditions to protect the electrical power distribution system and to ensure that
sufficient electrical power is available to other critical airplane systems. TRUE OR FALSE

A

TRUE

40
Q

can cabin crew reduce the ventilation to zero if they put the number of occupants as zero on the CAP

A

reduction is limited to ensure that a minimum air flow is

always supplied to the cabin.

41
Q

how is additional cooling provided by the lower recirculation ducts ?

A

the lower recirculation ducts contain liquid to air heat exchangers.

42
Q

How is lower recirculation cooling provided

A

provided by the integrated cooling system (ICS) which is a common galley cooling system

43
Q

what are the effects of turning the recirculation fans to off

A

it does not increase the amount of fresh air to the passenger cabin but it results in decreased airflow instead.
CAUTION: Recirculation fans must remain ON during hot weather operations unless a non-normal checklist directs to select them off.

44
Q

OJA-OJF

if smoke is detected in the AFT E/E equipment compartment what happens to the lower recirculation fans ?

A

the lower recirculation fans are commanded off

45
Q

when does the de-humidification system work ?

A

The system operates automatically when electrical power is available

46
Q

how does the de-humidification system work ?

A

It uses two zonal dryers (forward & aft) to remove moist air from the crown area. Fans recirculate dry air back to the crown area while moist air is exhausted below the cabin floor.

47
Q

Each trim air system supplies how may cabin zone ducts and flight deck zone duct ?

A

2 cabin zone ducts and one flight deck zone duct

48
Q

The target temperatures of each passenger cabin temperature zone may be further
modified plus or minus ______________within the range of 18º to 29º C, using the _____________

A

6º C, cabin

management system.

49
Q

what controls the pack outlet

temperature.

A

The temperature zone requiring the coolest temperature

50
Q

what happens If the flight deck or cabin temperature selector setting is unavailable to the pack
temperature controller

A

the pack outlet temperature is regulated to achieve either

the last temperature set or an average cabin temperature of 24º C.

51
Q

what happens If the left or right trim air system is off,

A

the cabin temperature controllers attempt to maintain all zones at the average target temperature. Flight deck temperature is maintained between 18º and 29º C.
The flight deck may become uncomfortably warm or cool. Setting the CABIN TEMP selector to a cooler or warmer master temperature may achieve a cooler or warmer flight deck temperature.

52
Q

The aft cargo compartment is heated but the compartment temperature is
uncontrolled true or false

A

true

53
Q

how is Ventilation

and heat are provided to the forward cargo

A

forward E/E cooling exhaust, in-line electric heaters and

a forward cargo exhaust fan

54
Q

the fwd cargo heater operates

to maintain a target temperature of ___________

A

21º C.

55
Q

how is Bulk cargo compartment ventilation and heat are provided

A

from cabin air passing through a supply fan and in-line electric heaters. In addition, there is some residual
heat from the aft E/E cooling exhaust entering from below the compartment floor

56
Q

what happens When an automatic overheat shutdown occurs BULK CARGO

A

cargo heat to the related compartment cannot be restored in flight. The EICAS advisory message CARGO HEAT BULK notifies the flight crew when the switch is off or a shutdown occurs.

57
Q

Aft cargo compartment ventilation and heat are provided from____________

A

aft E/E cooling exhaust entering from below the compartment floor. In addition, there is some residual heat due to air leakage through the insulated curtain from the bulk cargo compartment.

58
Q

[] CABIN ALTITUDE EICAS is of what level and what is the aural

A

warning level and aural siren

59
Q

How can speed excursions when flying near VMO/MMO during descent avoided due to winds and temperature changes ?

A

Pilot intervention via FLCH speed or manually flown pitch adjustments.

60
Q

CABIN TEMP HOT, CABIN TEMP COLD are annunciated or un-annunciated checklist ?

A

Un- annunciated checklist

61
Q

[] CABIN ALTITUDE AUTO is of what level and what is the aural

A

CAUTION level, aural Beeper
OUTFLOW VALVE
OPEN CLIMB
CLOSE DESCENT

62
Q

When manually controlling the cabin altitude and climb rate what is the recommended FPM for CLIMB and DESCENT

A

500 FPM

for both climb and descent

63
Q

Recommended cabin altitude in cruise up to FL230 is (QRH)

A

Landing field elevation

64
Q

CABIN TEMPERATURE is an annunciated checklist true or false. What is the objective of the checklist

A

TRUE
Objective is to descend and configure to provide alternate ventilation before the cabin or flight deck temperature causes incapacitation.

65
Q

When the flight deck or cabin temperature is too cold as directed by [] Cabin temperature eicas what does the checklist say about diversion and what happens to the bulk cargo hear

A

Checklist instructs to land at the nearest suitable airport.
Bulk Cargo heat is inoperative

66
Q

Alternate ventilation switch takes how long to reconfigure both outflow valves to the optimal flow position ?

A

3 mins

67
Q

With Cabin Temperature cold under most conditions cabin temperature should become warmer at what FL

A

above 22000 ft

68
Q

Cabin temp HOT

A

plan to land at the nearest suitable airport, descent to 10000 or lowest safe altitude

69
Q

what is the similarity and diffrences of Equipment cooling OVRD AFT and EQUIP CLG OVRD FWD

A

after 30 minutes of operation at low altitudes ad low cabin differential pressure, non critical equipments may fail. For FWD equip cooling overide forward cargo hear is inoperative

70
Q

what if a dog is being carried in the bulk cargo and the cargo heat bulk becomes inoperative ?

A

..

71
Q

If a checklist says plan to land withing 345 minutes after take off what is the best course of action

A

..

72
Q

which failure is more critical Equip cooling FWD or AFT

A

FWD
Both HUDs are inoperative.
Note: After 345 minutes, critical electronic equipment may fail. After 30 minutes, non-critical electronic equipment and EFB displays may fail. transponder/TCAS) may function for as little as 15 minutes before failing. By using both L and R side components, a total of 30 minutes of operation is possible for each function. Select functions OFF when they are not needed for safe operation. Operate one side (L or R) at a time when needed. To operate only one side at a time, select L or R component power to ON using the SYS
PWR menu. Then select the same L or R side using the TRANSPONDER menu and WEATHER RADAR menu (page 2/2).

73
Q

If the checklist advices to run the engine at idle for the rest of the flight what should be done ?

A

–

74
Q

what happens if The center pitot probe heat is failed.

A

The standby air data is unreliable in icing conditions

75
Q

what happens if the left or right pitot probe heat is failed.

A

The PFD and HUD air data are not affected by the failure of one or two pitot heats.

76
Q

what happens if the left, center, and right pitot probe heat are failed.

A

The standby air data is unreliable in icing conditions.

77
Q

ICE CRYSTAL ICING IS AN UN-ANNUNCIATED CHECKLIST

A

Ice crystal icing or TAT probe icing. Ice crystal icing conditions exist when in visible moisture and one or more of the following are present:
Amber or Red wx radar returns below the airplane
Appearance of liquid water on the windshield at a temperature too cold for rain (the sound is different from rain )
The A/t is unable to maintain the selected speed
TAT on EICAS stay near 0 c

78
Q

ICE CRYSTAL ICING information

A

An erroneous TAT indication can occur as a result of
ice crystals blocking the sensor. The erroneous
indication can last from one minute to more than 20
minutes. TAT normally should increase
approximately 2 degrees Celsius per 1000 ft of
descent.

787 (3 decks)

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