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B737-700 NG Systems > Bleed Air > Flashcards

Bleed Air Flashcards

1
Q

The APU supplies bleed air to which pneumatic duct?

A

Left

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2
Q

A high pressure ground source supplies bleed air to which pneumatic duct?

A

Right

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3
Q

What is bleed air used for on the 737-700 NG?

A

Engine starting, Engine anti-ice, wing anti-ice, Air conditioning, Pressurization, Water tank pressurization, Hydraulic reservoir pressurization

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4
Q

Which stage in the engine compressor section is the primary source of engine bleed air?

A

5th stage (low pressure stage)

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5
Q

The 9th stage (high pressure stage) valve is normally in what position during aircraft operations?

A

Closed. Only opens when 5th stage bleed air is insufficient for operations.

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6
Q

T/F: The engine bleed air valve also acts as a Pressure Regulating Shutoff Valve (PRSOV) ?

A

True

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7
Q

T/F: With the ISOLATION VALVE switch in AUTO, placing any one of the PACK switches or Engine BLEED Air switches to the OFF position causes the isolation valve to open automatically?

A

True

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8
Q

APU bleed air is available up to what altitude?

A

17,000 feet

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9
Q

The APU can provide air for ____ packs on the ground and ____ packs in flight?

A

2, 1

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10
Q

The APU should be operated for how many minutes before using it for bleed air?

A

2 minutes

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11
Q

After engine start, do NOT operate the engines above ___________ with the DUAL BLEED light illuminated.

A

idle thrust

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12
Q

Ground external air is primarily used for what purpose?

A

Engine starting when the APU is not available

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13
Q

T/F: The WING-BODY OVERHEAT light can be reset by pressing the TRIP RESET switch on the Bleed Air Panel?

A

False. The respective pneumatic duct has to cool before the annunciator light extinguishes.

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14
Q

What does the isolation valve do in the Bleed Air system?

A

Connects the left and right bleed air ducts

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15
Q

T/F: Bleed air pressure and temperature control is fully automatic

A

True

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16
Q

The engine bleed air valve is ________ controlled (by the Engine BLEED Air switch) and is ____________ operated

A

electrically (DC power); pneumatically

17
Q

When does the BLEED TRIP OFF light illuminate?

A

When the engine bleed air temperature and/or pressure exceeds a predetermined limit (causes the bleed air valve to automatically close). Requires resetting

18
Q

T/F: It is normal for the DUAL BLEED light to be illuminated after selecting the APU BLEED Air switch to ON.

A

True

19
Q

The WING BODY OVERHEAT light indicates a ______________

A

bleed air leak

20
Q

T/F: Bleed air pressure and temperature control is fully automatic.

A

True

21
Q

______________ are installed to monitor bleed air system temperature and pressure.

A

Bleed trip sensors

22
Q

The engine bleed air valves are _________ controlled and ___________ operated once sufficient pressure is available.

A

electrically, pneumatically

23
Q

With ISOLATION VALVE in AUTO, under what circumstances will the valve close automatically?

A

Both engine BLEED Air switches ON and both air conditioning PACK switches in AUTO or HIGH

24
Q

With the ISOLATION VALVE switch in AUTO, under what circumstances will the valve open automatically?

A

placing any one of the PACK switches or Engine BLEED Air switches to the OFF position

25
Q

APU Bleed Air is available up to what altitude?

A

17,000 feet

26
Q

What is the purpose of the DUAL BLEED light?

A

To advise the crew of possible situations that may backpressure the APU (avoid engine thrust above idle with the light illuminated)

27
Q

When will the DUAL BLEED light illuminate?

A
  1. When the APU Bleed Air valve is open and the No. 1 Bleed Air switch is ON
  2. When the APU Bleed Air valve is open, the Isolation Valve is open, and the No. 2 Bleed Air switch is ON
28
Q

T/F: The WING-BODY OVERHEAT light can be reset by pressing the TRIP RESET switch on the Bleed Air Panel?

A

False. The respective pneumatic duct has to cool before the light will extinguish

B737-700 NG Systems (23 decks)

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