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B737-800 > Air Systems > Flashcards

Air Systems Flashcards

1
Q

What is the minimum duct pressured climb and cruise?

After top of descent?

A

18 psi

10 psi

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2
Q

What does the PRSOV regulate pressure to?

A

42psi

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3
Q

What is the temperature limitation of the PRSOV?

A

232 deg c

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4
Q

The APU can provide bleed air or electrical power up to what alt?

It can provide Bleed air + electrical power up to…?

A

17,000 ft

10,000ft

Above 17,000 is electrical only

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5
Q

In the air, the APU can only supply bleed air to what?

A

Engine start systems
Cabin pressure and Thermal control
(No anti-ice or hydraulic reservoirs)

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6
Q

APU bleed air is ducted into the aircrafts…?

Which side?

A

Pneumatic manifold

Left side

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7
Q

If there is Dual Bleed air, what could this cause?

A

Rupturing of the manifold ducting.

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8
Q

If the Dual Bleed light illuminates on the ground what you do?

A

Thrust levers to idle, turn APU switch off or investigate.

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9
Q

What are the temp and pressure limitations, that shouldn’t be exceeded, on a Bleed air duct system?

A 
Temp = 232 deg c
Pressure = 60psi
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10
Q

External pneumatic power can be provided for a ground start when what 2 conditions have been met?

Temp and pressure must be controlled to?

A

Battery on
Packs off

232 deg, 60 psi

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11
Q

What does the Wing Body Overheat light indicate?

A

Leak in Bleed air system on a particular side

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12
Q

The flight deck gets its conditioned air from which pack by default?

A

Left

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13
Q

If the cont temp zone switch is set to OFF what will happen?

A

The flight deck trim air valve is closed and the temp controls produce 24 deg c demand

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14
Q

The fwd and aft passenger compartments are supplied with air from where?

A

The mixed manifold

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15
Q

What is the temperature range for the cabin selectors?

A

18-30 deg c approx

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16
Q

What is a pack?

A

Small air compressors that take Bleed air from the engines, cool it, filter it, then deliver it to the flight deck, fwd and aft cabin for temperature control

17
Q

High pack flow automatic protection, for when a pack fails, is only provided when?

A

In flight with trailing edge flaps in the up position

18
Q

How does a pack work?

A

It regulates Bleed air intake.
Cools it in a heat exchanger, cooled by ram air.
An air cycle machine then compresses the air.
It then enters another heat exchanger.
Cool compressed air passes through water abstraction ducts.
Enters the mixed manifold which can be regulated there with warmer trim air to make it more comfortable.

19
Q

P =

A

F/A

20
Q

What is pressure at msl in psi?

A

14.7 psi

21
Q

When carrying out a cross-bleed start, the trust on the operating engine must be increased to obtain a duct pressure of what?

A

30 psi

22
Q

The PRSOV will close under what 4 conditions?

A 
Starting engine (its PRSOV will close)
Fire switch pulled
Bleed air switch off
Bleed trip off (over-temp or over-pressure)
23
Q

When will the PRSOV close and BLEED TRIP-OFF light illuminate?

A

When an over-temperature 254 deg or over-pressure 220 psi is sensed.

24
Q

Recirculation fans are driven by…?

A

AC motors

25
Q

Equipment cooling fans are powered by…?

A

115 V AC

26
Q

The outflow valve is operated by 2…?

A

Cabin Pressure Controllers (CPCs)

27
Q

How much redundancy does the outflow valve have?

How many motors drive it?

How are the motors powered?

A

Triple redundant

3 DC motors

2 automatic by a CPC (DC BUS 1 and DC BUS 2)
1 manual from flight deck (BAT BUS)

28
Q

The outflow valve has a safety mechanism which forces it to close when the cabin altitude is above….?

A

14,500 ft

29
Q

When there is a loss of all sources of AC power, how do you control pressurisation?

A

Manually

30
Q

What does SMYD stand for?

A

Stall Management and Yaw Damper computer

31
Q

Cruise mode is activated when?

A

Within 0.25 psi of selected FLT ALT

32
Q

What is the DIFF PRESS limit at a selected FLT ALT of <28,000 ft

A

7.45 psi

33
Q

What is the DIFF PRESS limit at a selected FLT ALT of 28,000 - 37,000 ft

A

7.80 psi

34
Q

What is the DIFF PRESS limit at a selected FLT ALT of >37,000 ft

A

8.35 psi

35
Q

The two positive pressure relief valves open at what psi differential?

A

9.1 psi

36
Q

A negative relief valve opens at what psi differential?

A

-1.0

37
Q

When does the cabin altitude warning activate?

A

If cabin altitude reaches 10,000 ft

38
Q

Cabin Diff Press Indicator gets outside pressure data from where?

A

Alternate static ports

B737-800 (6 decks)

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