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NATOPS > Pressurization / BAECS > Flashcards

Pressurization / BAECS Flashcards

1
Q

Normal bleed air pressure

A

40-50 psi

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2
Q

Bleed air pressure check, 30 to 15 psi

A

Not less than 22 seconds

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3
Q

What systems use bleed air?

A

engine starting AC cabin pressurization leading edge ice protection ABSLATS

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4
Q

Where does the cross ship manifold extend across?

A

the wing front beams btwn engines 1 and 4

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5
Q

A bleed air duct that extends along the right side of the fuselage delivers bleed air for what?

A

the cargo compartment refrigeration unit and floor heat

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6
Q

What do bleed air compensators do? Where are they installed?

A

allow for expansion and contraction of the ducts caused by heating and cooling. in the longer sections of the bleed air ducts

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7
Q

If you close an isolation valve, are both refrigeration units lost?

A

No. the opposite pair of engines will drive both units.

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8
Q

Where are the isolation valves located?

A

on each wing just before the cross ship manifold enters the cargo compartment

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9
Q

If you close the divider valve, are both refrigeration units lost?

A

Allows at least one AC system to continue to operate.

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10
Q

Where is the divider valve located?

A

in the cross ship manifold between the two wing isolation valves.

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11
Q

What do the check valves in the bleed air system do?

A

Permit air flow in one direction only. Prevents air flow into an inoperative engine or the APU and loss of system pressure to the atmosphere

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12
Q

What do augmenter valves in the bleed air system do?

A

Regulate 14th-stage bleed air from the engine compressor

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13
Q

What does the BA/ECS do? What valves does it control?

A

regulates air temperature and pressure in the bleed air system augmenter valves and nacelle SOVs

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14
Q

Normal pressurization can be maintained with one AC, provided what else is on?

A

cargo underfloor heat

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15
Q

What does the outflow valve do in flight? on the ground?

A

in flight - exhausts air from the cabin at a controlled rate to maintain the desired level of pressurization on ground - allows avionics cooling discharge air to escape overboard

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16
Q

Where is the outflow valve located?

A

aft right hand corner of the flight station, behind the ACS.

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17
Q

What does the safety valve do?

A

relieves excessive positive or negative pressure to prevent damage to the aircraft or injury to personnel

18
Q

What does the MANUAL VALVE CONTROL ROCKER SWITCH do?

A

controls the electric actuator of the outflow valve. Functional only when the pressurization mode select switch is in MAN

19
Q

AUTO RATE SELECTOR What does NORM do? MIN? MAX?

A

NORM - provides a nominal climb rate of 500 fpm and a nominal descent rate of 300 fpm MIN - zero fpm rate MAX - 3000 fpm rate

20
Q

What does NO PRESS do?

A

opens the outflow and safety valves and depressurizes the cabin at the rate set by the AUTO RATE selector

21
Q

What does AUX VENT do?

A

opens the AUX VENT valves and closes the AC flow control valves and floor heat shutoff valves

22
Q

What does the LDG/CONST ALT selector do?

A

sets the altitude of the selected landing field or the desired altitude when in the CONST ALT mode

23
Q

What does the DIF PRESS indicator display?

A

the cabin-to-atmosphere differential pressure in inches of mercury

24
Q

What does the EMER DEPRESSURE handle release?

A

releases the emergency depressurization door in the center overhead escape hatch

25
Q

Which cabin pressurization system switch controls the electric actuator of the outflow valve when the pressurization mode switch is in the MAN position?

A

MANUAL VALVE CONTROL switch

26
Q

Basically, how is pressurization achieved?

A

with air supplied from the bleed air system and ducted through the air conditioning system

27
Q

What event would have to occur to force the safety valve to work?

A

combination of the cabin pressure controller and outflow valve fails to regulate the cabin pressure within structural limits

28
Q

At what differential pressures does the safety valve open?

A

14.96 in Hg or -0.76 in Hg

29
Q

What are the 6 sub modes within the AUTO mode of the cabin pressurization system?

A

GROUND - provides an unpressurized cabin by opening the outflow and safety valves PREPRESSURIZATION - as power levers are advanced above FLT IDLE for takeoff, cabin altitude begins a descent to 300 ft below field elevation CLIMB - occurs at liftoff. Either with WOW or gear is retracted and IAS is greater than 100 kts CRUISE - cabin altitude will increase to the auto schedule value and hold that value after the aircraft altitude remains constant within 200 feet for 10 minutes DESCENT - initiated when aircraft altitude decreases 1,000 ft or more from the highest altitude achieved during flight LANDING - WOW or landing gear extended and IAS is less than 60 kts

30
Q

When will you get the CAB PRESSURIZED ACAWS?

A

differential pressure exceeds 0.2 in Hg with WOW and power levers below FLT IDLE

31
Q

What is the duty cycle of the outflow valve manual control motor?

A

3 mins on, 17 mins off

32
Q

When will you get the CAB ALT HIGH ACAWS?

A

when cabin altitude is greater than 10,000 ft

33
Q

The constant altitude pressurization mode uses what as an altitude reference?

A

pilot barometric setting

34
Q

What is the rate of depressurization when the EMER DEPRESS switch is in the DUMP position?

A

an uncontrolled rate independent of cabin altitude

35
Q

What 3 valves close when the EMER DEPRESS switch is in the DUMP position?

A

floor heat shutoff valve flight station AC control valve cargo compartment AC control valve

36
Q

How long does it take to gain control of the outflow valve in manual pressurization mode?

A

40 seconds

37
Q

What does the cross flow valve in the AC system do?

A

connects the flight station and cargo compartment distribution ducts so that one system can provide AC to both the flight station and cargo compartment

38
Q

What are the two stages of the refrigeration unit in the AC system?

A

air-to-air heat exchanger cooling turbine

39
Q

Under what conditions might the ECS produce small chunks of ice and expel them at high speed from the air conditioning outlets?

A

high humidity

40
Q

How much water is removed from the refrigerated air by the water separators?

A

70-85 percent

41
Q

In which position is the pressurization mode select switch placed when using an external air conditioning unit?

A

AUX VENT

NATOPS (14 decks)

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