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Boeing 787 RR > Air Condition > Flashcards

Air Condition Flashcards

1
Q

With the APU ASGs supplying power to the airplane, how many CACs operate on the ground with an outside air temperature of 70F (21C)

A. All packs

B. 1 per pack

C. 3

A

B. 1 per pack

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2
Q

What controls the air conditioning pack system components in the pack bay?

A. The pack control unit in the pack bay

B. Software in the common core system (CCS) through remote power distribution units (RPDU) in the pack bay

C. The pack control unit in the opposite pack bay

A

A. The pack control unit in the pack bay

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3
Q

What is one of the functions of the add heat valve?

A. To increase output flow rate of the CAC

B. To increase output temperature of the CAC

C. To provide primary surge protection of the CAC

A

B. To increase output temperature of the CAC

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4
Q

During flight, the left air conditioning pack suddenly starts to use more electrical power. What is a possible cause for this?

A. The left lower recirculation fan stopped operation

B. The bearing of the left air cycle machine (ACM) are dry

C. There is a leak in the trim air system downstream of the left trim air pressure

A

A. The left lower recirculation fan stopped operation

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5
Q

What protects the airplane if a hot duct breaks in the right pack bay?

A. The overheat detection system (ODS) stops operation of the left pack

B. The output temperature of the right pack decreases

C. The overheat detection system (ODS) stops operation of the right pack

A

C. The overheat detection system (ODS) stops operation of the right pack

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6
Q

What is used to control zone B temperature?

A. Trim air and a zonal duct heater

B. Trim air from the 2 packs

C. Air from the upper recirculation fan

A

A. Trim air and a zonal duct heater

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7
Q

The flight deck boost fan isolation valve opens to the left boost fan pull conditioned air from the zone A supply duct, what is the purpose of this?

A. To let exhaust air go from the flight deck to the forward cargo compartment

B. To let air go to the flight deck

C. To make sure that air from the alternate ventilation system (AVS) does not go to the flight deck

A

B. To let air go to the flight deck

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8
Q

The ground call horn is on. A possible cause of this is low air flow in what system?

A. Forward equipment cooling system

B. Lavatory/galley ventilation (LGV) system

C. Miscellaneous equipment cooling system

A

A. Forward equipment cooling system

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9
Q

On the ground, the aft outflow valve (OFV) ground gate is in the close position. What is a possible cause for this?

A. The forward OFV is in the full open position

B. The aft OFV is in the manual control mode

C. The forward OFV is in the manual control mode

A

B. The aft OFV is in the manual control mode

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10
Q

After a negative pressure relief condition occurs, what would an inspection on the ground show?

A. No indication that the negative pressure relief valves (NPRV) opened

B. The negative pressure relief valves (NPRV) flapper is in the open position

C. The red band around the edge of the pressure relief valves (NPRV)

A

A. No indication that the negative pressure relief valves (NPRV) opened

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11
Q

The right power electronics cooling system (PECS) is in operation with a leak detected in the aft part of the system. What does the PECS maintenance page data shows for the right PECS isolation valve?

A. Open to permit PECS flow to the integrated cooling system (ICS) component

B. Closed to stop PECS flow to the high voltage dc components

C. Closes to stop PECS flow to the integrated cooling system (ICS) components

A

C. Closes to stop PECS flow to the integrated cooling system (ICS) components

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12
Q

The pack control unit sensed a pack overheat and caused a pack trip. This stopped pack operation. How can the flight crew start the pack again?

A. The pack control unit starts the pack again when the overheat condition goes away

B. Cycle the pack switch from OFF to AUTO

C. Momentarily push the AIR COND RESET switch

A

C. Momentarily push the AIR COND RESET switch

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13
Q

What prevents ice in the air conditioning pack condenser?

A. The low limit valve (LLV)

B. The air cycle machine (ACM) bypass valve (ABV) closes to let more air flow through the condenser

C. The diverter valve of the lower recirculation air heat exchanger opens to increase the temperature of the air that goes to the condenser

A

A. The low limit valve (LLV)

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14
Q

The cabin crew report shows the temperature selection for the one of the passengers zones is always unusually high, what is a possible cause?

A. Blockage prevents air flow over the related zone temperature sensor

B. The related zone temperature sensor fan does not operate correctly

C. There is a leak in the supply duct to the related trim air pressure regulator valve

A

A. Blockage prevents air flow over the related zone temperature sensor

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15
Q

How do the lower recirculation air fans help to control the cabin air humidity?

A. The fans move the moist air of the cargo compartments into the air conditioning

B. The fans move dry air from the mix bay area into the air conditioning distribution system

C. The fans move the moist air of the zonal dryers exhaust back into the air conditioning distribution system

A

C. The fans move the moist air of the zonal dryers exhaust back into the air conditioning distribution system

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16
Q

Where are the power electronics cooling system (PECS) pump packages located?

A. Aft equipment bay

B. Left and right environmental control system (ECS) bays

C. Main gear wheel wells

A

C. Main gear wheel wells

17
Q

A flight crew report for cargo compartment shows the bulk cargo compartment temperature is always 70F (21c). What is a possible cause?

A. The BULK control switch on the P5 panel is in the off position

B. The aft outflow valve (OFV) is in the closed position

C. Operation is correct

A

C. Operation is correct

18
Q

How does the forward cargo heat system control the temperature of the forward cargo compartment?

A. Automatic control of a heat supply fan

B. Automatic control of valves and an in-line heater

C. Manual control of an in-line heater

A

B. Automatic control of valves and an in-line heater

19
Q

After selection of ALTN on the P5 VENTILATION switch, an adjustment at the P13 panel does not cause a change in temperature of the foot heater. What is a possible cause for this?

A. There is a malfunction in the trim air pressure regulator valve

B. The foot heater is deactivated when the alternate ventilation system (AVS) operates

C. There is a malfunction in the micro processor in the P13 panel

A

B. The foot heater is deactivated when the alternate ventilation system (AVS) operates

20
Q

What component controls the cabin air compressor (CAC) speed?

A. The pack control unit trough the common starter controller (CMSC)

B. One of 2 remote power distribution units (RPDU)

C. The secondary power unit trough a dedicated CAC electrical power source

A

A. The pack control unit trough the common starter controller (CMSC)

21
Q

In the overheat detection system (ODS), where are the dual-element sensor loops located?

A. Dual-element sensor loops in each pack bay and 2 in the nitrogen generation system (NGS) bay

B. 2 dual-element sensor loops in each pack bay and one in the nitrogen generation system (NGS) bay

C. 5 dual-element sensor loops in each pack bay

A

B. 2 dual-element sensor loops in each pack bay and one in the nitrogen generation system (NGS) bay

22
Q

Where does the passenger entry door area get heat for?

A. Radiant heaters in floor panels

B. Trim air ducts outlets at the floor level

C. In-line heaters in air conditioning distribution ducts through outlets at the floor levels

A

A. Radiant heaters in floor panels

23
Q

During descent, the cabin attendant crew reported that there was a clear moisture build up in the cabin and some locations as a mist in the cabin. What is a possible cause?

A. A leak in the power electronics cooling system (PECS)

B. The desiccant wheel for the zonal dryer is not serviceable

C. A leak in the integrated cooling system (ICS)

A

B. The desiccant wheel for the zonal dryer is not serviceable

24
Q

The 2 lavatory/galley ventilation (LGV) fans are off in flight . What is a possible cause?

A. A fire alarm is active in the aft cargo compartment

B. The smoke detector in the lavatory/galley ventilation (LGV) system sense smoke

C. The P5 CABIN/UTILITY switch is in the OFF position

A

A. A fire alarm is active in the aft cargo compartment

25
Q

What is a possible effect of a power electronics cooling system (PECS) fluid leak in a connection of the lavatory/galley ventilation system heat exchanger?

A. A decrease in cooling by the integrated cooling system (ICS)

B. A total shutdown of the related PECS

C. Food in the galley must be too cool

A

A. A decrease in cooling by the integrated cooling system (ICS)

26
Q

During the flight there is a failure of the 2 forward EE cooling supply fans. What supplies forward EE cooling?

A. The supply/override valve stays closed and the air conditioning system cooling air supplies EE cooling

B. The supply/override valve goes to override position to permit airflow from differential pressure

C. The supply/override valve goes to override position to permit external airflow to the equipment

A

B. The supply/override valve goes to override position to permit airflow from differential pressure

27
Q

When does the forward cargo electric heater not operate?

A. The cargo door is open

B. Forward equipment cooling is in the partial cargo mode

C. The airplane is on APU power

A

A. The cargo door is open

28
Q

What could be a possible cause for the forward cargo air conditioning (FCAC) to not operate when the only power source is external power?

A. This is normal operation

B. There is a fault in the forward cargo air conditioning (FCAC) cargo refrigeration unit (CRU)

C. There is a fault in the forward cargo air conditioning (FCAC) pump

A

A. This is normal operation

29
Q

How is heat removed from the forward cargo air conditioning (FCAC) cargo refrigeration unit (CRU)

A. Power electronics cooling system (PECS) cooling fluid moves the heat to the PECS ram air heat exchangers

B. FCAC cooling fluid goes through the system and moves the heat to 2 FCAC ram air heat exchangers

C. Recirculation air form under the cargo floor goes through the CRU to decrease the temperature of the system

A

B. FCAC cooling fluid goes through the system and moves the heat to 2 FCAC ram air heat exchangers

30
Q

The forward outflow valve (OFV) on the 787-8 is interchangeable with what other OFV?

A. The 787-8 aft OFV

B. The 787-9 aft OFV

C. The 787-9 fwd OFV

A

A. The 787-8 aft OFV

31
Q

When can an outflow valve (OFV) of the CABIN pressure control system (CPCS) operate in the manual mode?

A. Only if the other OFV operates in the automatic mode

B. At the same time as the other OFV operates in the manual or automatic mode

C. Only during manual landing altitude selection at the P5 PRESSURIZATION panel

A

B. At the same time as the other OFV operates in the manual or automatic mode

32
Q

Control of the air conditioning system devices in the pack bay comes form?

A. Directly from the pack controls unit

B. Indirectly from the P5 control panel switches through remote power distribution units (RPDU) in the pack bay

C. Indirectly from the pack control units (PCU) through remote power distribution units (RPDU) in the pack bay

D. Indirectly from the Common core system (CCR) through remote power distribution units (RPDU) in the pack bay

A

.

33
Q

On the ground, what prevents water spray and FOD damage to the cabin air compressors (CAC)?

A. Inlet deflector doors

B. ADD heat valve

C. Inlet FOD screens

D. Variable diffuser

A

.

34
Q

How does the cabin air compressor (CAC) control the temperature of the supply air to the trim air system?

A. The CAC ADD heat valve (AHV) sends more or less warm outlet air back to the CAC inlet

B. The CAC opens or closes the trim air pressure regulator valve

C. The CAC opens or closes the low limit valve (LLV)

D. The CAC variable diffuser changes the internal airflow

A

.

35
Q

If the lower recirculation air duct in the environmental control system (ECS) bay breaks, what occurs to help keep cabin air pressure correct?

A. The high flow shutoff valve (HFSOV) closes

B. The related air conditioning pack goes off

C. The lower recirculation fan goes off

D. The forward outflow valve (OFV) opens

A

.

36
Q

In the compact mixers, cool air from the air conditioning pack outlet mixes with?

A. Cold, moist air from the lower recirculation air heat exchanger

B. Cold, dry air from the alternate ventilation system (AVS)

C. Warm, dry air from the lower recirculation air fans

D. Warm, dry air from the trim air pressure regulator valve

A

.

37
Q

A high level, continuous noise comes from under the aft fuselage when the airplane is on the ground. A possible cause is?

A. The normal outflow of exhaust air from the miscellaneous equipment cooling system through the aft outflow valve (OFV)

B. The normal shutdown of exhaust air form the bulk cargo compartment heat system overboard exhaust shutoff valve

C. The aft equipment cooling system operates with the override valve in the open position

D. Normal outflow of exhaust air from the aft equipment cooling system exhaust overboard exhaust (SKIN FLUSH) valve

A

.

Boeing 787 RR (5 decks)

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