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737 > Air System > Flashcards

Air System Flashcards

1
Q

What sources supply air to the bleed air (pneumatic) system?

A

Engines, APU, External High Pressure Air

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2
Q

What systems rely on bleed (pneumatic) air for operation?

A

Air Conditioning/Pressurization, Wing/Engine Anti-Ice, Engine Starting, Hydraulic Reservoir Pressure, Water Tank Pressure, Nitrogen Generation System

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3
Q

What is the purpose of the Engine Bleed Air Valve, and how is it operated?

A

Pressure regulator and shutoff valve. DC-controlled, pressure-operated.

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4
Q

What is the purpose of the Precooler System?

A

Regulates (cools) the temp of the Engine bleed air down via an air to air heat exchanger.

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5
Q

What causes Bleed Trip Sensors to automatically close the Engine Bleed Air Valve? What is the indication?

A

Excessively high engine bleed air temperatures (254c)

Excessively high pressure (220 psi)

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5
Q

What causes Bleed Trip Sensors to automatically close the Engine Bleed Air Valve? What is the indication?

A

Excessively high engine bleed air temperatures (254c)

Excessively high pressure (220 psi)

BLED TRIP OFF (amber) light

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6
Q

Can the bleed trip condition be reset?

A

Yes with the TRIP RESET switch if the exceedance(s) no longer exist

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7
Q

Where does the APU Bleed Air Valve provide air to? How is it controlled/operated?

A

APU bleed air to the left duct

With the APU Bleed Switch which is DC-Controlled, pneumatically operated

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8
Q

What is the purpose of the Isolation Valve?

A

Isolates the left and right bleed air ducts during normal ops.

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9
Q

What is the position of the Isolation Valve in Auto?

A

Isolation valve will auto close when both engine bleed ON and Both PACKs AUTO/HIGH and switching any to off (four corner switches)

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10
Q

What does a DUAL BLEED (amber) light indicate?

A

Illuminates when the APU Bleed Air Valve is open and:
Engine 1 Bleed Switch is On and/or
Engine 2 Bleed Switch is On with the isolation valve open.

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11
Q

What does the WING-BODY OVERHEAT (amber) light on the Bleed Air Panel indicate?

A

Indicates an overheat has been detected.

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12
Q

What is the primary source of conditioned air for the flight deck? Passenger cabin?

A

Flight deck: Directly from the Left pack.

Passenger Cabin: Excess air from the Left pack, air from the Right Pack, and air from the Air Recirculation System

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13
Q

Where does the Mix Manifold mix air come from?

A

Left and Right Packs, as well as recirculated air

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14
Q

A single pack in high flow mode can maintain pressurization to what altitude

A

FL410

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15
Q

What is the AUTO logic of the Pack Switches with a pack or engine failure

A

With the flaps up if an Engine or a Pack fail the operating Pack automatically goes into HIGH mode.

16
Q

What is indicated by the PACK (amber) light on the Bleed Air Panel?

A

Indicates failure of both the primary and standby pack controls for the same pack.

17
Q

How is the PACK system cooled?

A

PRIMARY HEAT EXCHANGER: Bleed air is introduced into the exchanger where ram air lowers the bleed air temperature.

18
Q

What is indicated by bright blue RAM DOOR FULL OPEN light?

A

Illuminates whenever a ram door is fully open.

19
Q

What is the purpose of the recirculation fans?

A

-Reduce load on engines
-Increase cabin humidity
-reduce airborne particulates and micro-organisms in the cabin using HEPA filters

20
Q

What are the zones of the temperature control? How are temperatures controlled?

A

Flight Deck, Forward Cabin, Aft Cabin

Through the Air Conditioning Panel using the Trim Air System

21
Q

What does ZONE TEMP (amber) light indicate?

A

Indicates a supply duct overheat and the associated Trim Air Modulating Valve closes.

22
Q

What limitations, if any, are there when using external pneumatic air?

A

Both PACK switches should be positioned to OFF

23
Q

Which, if any, of the cargo compartments are heated?

A

Forward Cargo compartment.

24
Q

What is the purpose of the Equipment Cooling System?

A

Cool electronic equipment in the Flight Deck and the E/E bay.

25
Q

What does the Equip Cooling OFF (amber) light indicate?

A

Indicates the loss of airflow due to the failure of the respective Equipment Cooling Fan.

26
Q

What does the Cabin Pressurization Mode Selector do?

A

is used to select the Cabin Pressure Controller operational mode:
AUTO, ALTN, MAN

27
Q

On the Cabin Pressurization Panel, what do the FLT ALT and LAND ALT indicators display? What are the indications and impact of a panel failure?

A

Display Flight Cruise Altitude and Intended landing Altitude.

Indicator failure may display non-hyphen numbers or a blank display. If the display cannot be changed it may be necessary to monitor the Pressurization system to ensure normal operation.

28
Q

What causes the AUTO FAIL (amber) light to illuminate?

A

Illuminates if any of the following conditions occur:
-Loss of DC power
-controller fault
-Outflow valve control fault
-excessive differential pressure >8.75psi
-excessive rate of cabin pressure change 2000fpm or greater
-high cabin altitude (above 15,800’)

29
Q

What causes the illumination of the OFF SCHED DESCENT (amber) light?

A

Illuminates if the aircraft begins to descend without having reached the preset cruise altitude.

30
Q

What do the ALTN (green) and MANUAL (green) lights indicate on the Cabin Pressurization panel?

A

ALTN: illuminates when in Alternate Automatic Mode, or Pressurization Mode Selector has been moved to the ALTN position.

MANUAL: illuminates with the Pressurization Mode Selector in the MAN position.

31
Q

What is indicated by the CABIN ALTITUDE (red) light and the Cabin Altitude Warning Horn? How can this horn be silenced?

A

Horn activates and light illuminate when the cabin altitude exceeds 10,000’ +/- 1000’

737 (18 decks)

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