2 Air Systems

Question 1

The air condition Pack control, zone temperature control, fault detection, and overheat protection
are all:

Answer 1

Automatic

Question 2

The airplanes air condition is divided into three temperature zones:

Answer 2

Flight deck and two cabin
zones.

Question 3

How many air conditioning packs are there?

Answer 3

Two

Question 4

In which case are the packs output limited?

Answer 4

During high bleed air demand periods (such as during takeoff/landing or with an
engine inoperative). Pack output is further reduced when the main cargo fire
suppression system is activated.

Question 5

Pack selector in AUTO, pack output temperature is determined by?

Answer 5

The left and right cabin temperature controllers:

Question 6

Pack selector in STANDBY, pack output temperature is determined by?

Answer 6

The position of the pack selector:
- N (normal) - constant, moderate temperature
- W (warm) - full warm.

Question 7

Are you able to get conditioned air without the use of the packs?

Answer 7

Yes. When a ground source of conditioned air is available.

Question 8

L or R PACK TEMP means?

Answer 8

All pack control system faults or overheats.

Question 9

An automatic control system fault or a pack outlet overheat requires:

Answer 9

Crew interaction

Question 10

When an internal
pack overheat is detected:

Answer 10

The pack valve closes and the pack is shut down automatically.

Question 11

PACK TEMP and L or R PACK OFF EICAS massage will be displayed together when?

Answer 11

When an internal
pack overheat is detected.

Question 12

The pack controllers regulate the pack output air temperature to satisfy the
temperature requirement of the compartment requiring:

Answer 12

The coolest air

Question 13

What does trim air?

Answer 13

Trim air adds hot air from the bleed air system to the to hottest compartments.

Question 14

What does FLT DECK TEMP, FWD CABIN TEMP or AFT CABIN TEMP mean?

Answer 14

Zone temperature controller failure, compartment temperature control is in the OFF position (FWD and AFT
CAB only) or trim air switch is OFF

Question 15

TRIM AIR means?

Answer 15

TRIM AIR switch is off

Question 16

What happens when the trim air system is off?

Answer 16

The packs attempt to maintain all compartments at an average temperature.

Question 17

The forward equipment cooling system supplies:

Answer 17

Cooling air to equipment in the
forward electronic equipment racks and the flight deck avionics.

Question 18

FWD EQPT VAL means?

Answer 18

The system valves fail to reconfigure during automatic operation.

Question 19

FWD EQPT OVHT means?

Answer 19

Low airflow or high temperature is sensed.

Question 20

FWD EQPT SMOKE means?

Answer 20

Smoke is sensed in the forward equipment cooling ducts.

Question 21

FWD EQPT COOLING means?

Answer 21

No cooling airflow is sensed after selecting OVRD.

Question 22

The cargo heat system are provided heat from?

Answer 22

The bleed air system.

Question 23

Regarding the cargo heat system, the system automatically maintains compartment temperature
above:

Answer 23

Approximately 45°F (7°C)

Question 24

The BULK CARGO HEAT selector allows a higher temperature to be selected for
the bulk compartment. With the
selector in the VENT position, the bulk compartment is maintained above
approximately:

Answer 24

65°F (18°C)

Question 25

FWD, AFT or BULK CARGO OVHT means?

Answer 25

The cargo compartment temperature is above the standard control range.

Question 26

A compartment shutoff valve closes automatically if a compartment temperature exceeds:

Answer 26

approximately 90°F (32°C). When the compartment temperature decreases below the overheat temperature setting the OVHT light extinguishes, the EICAS message is removed, and the compartment shutoff valve re-opens.

Question 27

The Main Deck Temperature Selector determines which of two separate temperature control ranges will apply. Those are:

Answer 27

1. ANIMAL/NORM: Suitable for cargo such as live animals that require moderate temperatures. 2. PERISHABLE: Suitable for carrying cargo requiring cooler than moderate temperatures.

Question 28

Cabin pressurization is controlled by:

Answer 28

Adjusting the discharge of conditioned cabin air through the outflow valve.

Question 29

What protects the fuselage against excessive pressure differential?

Answer 29

The positive pressure relief valves and negative pressure relief doors.

Question 30

The pressurization system can be operated in which modes?

Answer 30

Automatic and manual

Question 31

What happens if the pressurization system in automatic mode fails?

Answer 31

It is automatically switched to the other auto mode. AUTO 1 to AUTO 2 or vice versa.

Question 32

How is the cabin pressurization schedule calculated in automatic mode?

Answer 32

The pressurization system uses ambient pressure data from the air data system in conjunction with the selected cabin auto rate, the takeoff altitude and the indicated landing altitude.

Question 33

How is the cabin pressurization during takeoff in automatic mode?

Answer 33

The system supplies a small positive pressurization to cause a smooth cabin altitude transition.

Question 34

How is the cabin pressurization during climb in automatic mode?

Answer 34

Cabin altitude increases on a schedule related to the takeoff field elevation, airplane altitude, and the selected auto climb rate limit.

Question 35

What happens if the max cabin pressure differential is reached during climb?

Answer 35

Cabin climb rate becomes a function of airplane climb rate, while maintaining the maximum differential pressure.

Question 36

Whitch altitude is selected for the cruise cabin altitude?

Answer 36

The higher of the landing altitude and the scheduled cabin altitude.

Question 37

What happens in the descent and landing in automatic mode regarding the pressuriziation system?

Answer 37

The cabin altitude decreases to slightly below the selected landing altitude. This ensures that the airplane lands pressurized.

Question 38

During landing the pressuriziation system in automatic mode will ensure the airplane lands pressurized. The barometric pressure correction comes from?

Answer 38

The captain’s altimeter.

Question 39

Regarding the pressuriziation system. What happens at touchdown?

Answer 39

The outflow valve opens to depressurize the airplane.

Question 40

CABIN ALTITUDE means?

Answer 40

The cabin altitude is above 10,000 feet.

Question 41

When will the CABIN ALTITUDE message be removed?

Answer 41

When the cabin altitude descends below 8,500 feet.

Question 42

CABIN AUTO INOP means?

Answer 42

Automatic pressurization control fails or when cabin altitude MODE SELECT is MAN

Question 43

How is the positive pressure relief valves and negative pressure relief doors operated in conjuction with the pressuriziation control system?

Answer 43

It is not. It operate independently to protect the fuselage against excessive pressure differential.

Question 44

What happens when the cabin altitude exceeds 11,000 feet?

Answer 44

The system automatically close the outflow valve.

Question 45

Bleed air can be supplied by?

Answer 45

The engines, APU, or a ground air source.

Question 46

Bleed air is used for?

Answer 46

- air conditioning - pressurization - engine start - wing and engine anti-ice - center hydraulic system air driven pump (ADP) - hydraulic reservoir pressurization

Question 47

When is the HP air used in the beed air system?

Answer 47

During descent and other low power setting operations.

Question 48

The engine bleed air valves may close when?

Answer 48

- The APU is starting either engine. - Ground pneumatic air is connected - During periods of low engine bleed air demand (such as when the air conditioning packs are off)

Question 49

L or R ENG BLEED OFF means?

Answer 49

The engine bleed air valve is closed for a system fault.

Question 50

L or R ENG BLD OVHT means?

Answer 50

The engine bleed air temperature is excessive.

Question 51

L or R ENG HPSOV means?

Answer 51

The engine high pressure bleed air valve is open when commanded closed.

Question 52

L or R ENG PRV means?

Answer 52

The pressure regulating valve is open when commanded closed.

Question 53

The APU bleed air is available up to?

Answer 53

17,000 feet.

Question 54

What prevents reverse flow of bleed air from the duct into the APU?

Answer 54

The check valve in the APU supply line.

Question 55

APU BLEED VAL means?

Answer 55

The APU bleed valve position disagrees with the commanded position.

Question 56

The L and R bleed air isolation valves are normally closed. Except for?

Answer 56

Engine start or single bleed source operation.

Question 57

The center bleed air isolation valve is normally?

Answer 57

In the open position.

Question 58

C, L or R BLD ISLN VAL means?

Answer 58

The bleed isolation valve position disagrees with the commanded position.

Question 59

L or R BLD DUCT LEAK, BODY DUCT LEAK or STRUT DCT LEAK means?

Answer 59

A high temperature bleed air leak is detected.

Question 60

L or R ENG BLD OVHT means?

Answer 60

A higher than normal temperature is detected by the bleed air temperature sensor.

Question 61

What happens automatically if a bleed overheat occurs?

Answer 61

The engine bleed air valve is automatically closed

Question 62

If a bleed overheat situation has occured and the engine bleed air valve is closed. What will happen if engine anti-ice is activated?

Answer 62

It will cause the PRV to open to provide cowl anti-ice unless a strut duct leak exists.