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NEW Alaska B737 Systems > Air Systems > Flashcards

Air Systems Flashcards

1
Q

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

A

Engine bleeds,
APU bleed,
External pneumatic air

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2
Q

What systems rely on bleed air for operation?

A

Pressurization,
Air conditioning,
Anti-ice (wing/engine),
Engine starting,
Hydraulic reservoir pressurization,
Potable water tank pressurization,
Nitrogen generation system

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3
Q

What is the purpose of the Engine Bleed Air Valve? How is it operated? When does it close?

A

Provides engine bleed air (if available) to respective bleed duct

Pressure regulator and shutoff valve (PRSOV)

DC controlled, pneumatically actuated (monitored by FMC)

Closes when:
-Switch off
-Fire switch pulled
-Engine start
-Excessive bleed temperature or pressure

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4
Q

What is the purpose of the engine bleed air precooler system?

A

Regulates temperature of engine bleed air

Fan bypass air across an air-air heat exchanger

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5
Q

What causes Bleed Trip sensors to automatically close the Engine Bleed Air Valve? How is it reset?

A

Overheat or over-pressure (254C/220PSI)

Reset if condition no longer exists and TRIP RESET pushed

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6
Q

What does WING-BODY OVERHEAT indicate?

A

WING BODY OVERHEAT
-Overheat detected due to bleed air duct leak
–Requires AC power
–Monitors
—L/R engine strut cavity
—L/R wing and leading edge ducts
—L/R A/C packs
—Keel beam (L)
—Aft cargo (L)
—APU cavity (L)

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7
Q

What does BLEED TRIP OFF indicate?

A

Engine bleed air valve automatically closed due to high pressure or temperature

TRIP RESET works if condition no longer exists

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8
Q

What does DUAL BLEED indicate?

A

APU bleed air valve OPEN and another source SELECTED to power left bleed duct

APU Bleed switch on and Engine 1 Bleed switch on, OR

APU bleed switch on, ISO VALVE open, and Engine 2 bleed switch on

Thrust must be limited to idle if DUAL BLEED illuminated

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9
Q

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

A

Provides APU bleed air to the left pneumatic duct

DC controlled, pneumatically operated

Duct check valve protects APU duct from engine bleed air

Pressure valve protects APU duct from overpressure

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10
Q

What is the purpose of the isolation valve?

A

Isolates left and right bleed air ducts during normal operations

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11
Q

What do the Isolation Valve positions CLOSE, OPEN, AUTO do?

A

Close and open as selected

AUTO
–Close when engine bleeds on AND packs AUTO/HIGH
–Open when any engine bleed or pack selected OFF
(four corners)

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12
Q

How do the Engine Bleed air or Air Conditioning PACK switches impact the operation of the isolation valve?

A

Valve closed during normal operations
–Both engine bleeds ON and both packs AUTO/HI

Valve open if either engine bleed or pack switched OFF
(four corners)

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13
Q

Where is the external pneumatic air connection located?

A

Aircraft right immediately aft of landing gear

Enters right bleed air duct

CAUTION – Monitor WING-BODY OVERHEAT
(Requires AC power)

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14
Q

What is the path of pre-conditioned external (ground) air?

A

Pre-condition air enters the mix manifold (downstream of PACKs)

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15
Q

When connected to external air what position should the packs be in?

A

External preconditioned air – packs OFF

External pneumatic air – packs as appropriate

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16
Q

What is the primary source of conditioned air to the Flight Deck? Passenger Cabin?

A

Flight deck – left pack
Passenger cabin – right pack (and some left pack air)

17
Q

How is the forward cargo compartment heated? Aft cargo?

A

Forward cargo is heated from Equipment Cooling exhaust fans

Aft cargo unheated

18
Q

What do the PACK amber lights indicate?

A

Failure of both primary and standby pack controllers, or

Pack trip (overheat) (trip reset possible), or

Single controller failure (during recall)

19
Q

What happens to the master caution during a failure of primary pack controller? Standby?

A

Single controller – Master Caution on RECALL

Both Controllers (or pack overheat) – Master Caution

20
Q

A single pack in high-flow mode can maintain pressurization and comfort up to what altitude?

A

Maximum certified ceiling

41,000’

21
Q

What is the auto-logic for PACK high airflow during normal operations with pack or engine failure?

A

Remaining pack to HI when flaps up

22
Q

What controls pack temperature?

A

Zone requesting coldest temperature

Trim air makes up the difference for remaining zones

23
Q

What is the purpose of the recirculation fans?

A

Reduction in engine bleed air, and

Recirculates air, and

Higher relative humidity, and

Air filtration (HEPA)

Note: recirc air comes from electronics bay and pax floor grills, towards fwd cargo lining to mix manifold

24
Q

What is the purpose of the equipment cooling system?

A

Cools electronic equipment in the flight deck and E/E bay

Heats forward Cargo

Smoke removal via opening OEV (normally closed in flight, open on ground)

4 fans – 2 supply and 2 exhaust

25
Q

What does the EQUIP COOLING OFF light indicate?

A

Loss of airflow due to failure of respective equipment cooling fan

Ground crew call horn activates on the ground

26
Q

What causes AUTO FAIL to illuminate?

A

Primary controller fault, or

Outflow valve control fault,
Excessive differential pressure,
Excessive cabin pressure change (>2000fpm),
Excessive cabin altitude (>15,800’),
Loss of DC power

27
Q

What causes the OFF SCHED DESCENT light to illuminate?

A

Aircraft begins to descend without reaching preset cruise altitude

Pressurization automatically returns to departure elevation
–Unless FLT ALT reset (also reset LAND ALT)

28
Q

How does the primary heat exchanger lower bleed air temperature?

A

Ram air lowers bleed air temperature

Insufficient ram air flow augmented by ACM induction impeller

29
Q

What is indicated by a bright blue RAM DOOR FULL OPEN light? Dim Blue? Extinguished?

A

Bright blue – Ram Air door fully open
–On the ground, or airborne (slow) and flaps extended

Extinguished
–Closed or modulating

No dim blue

30
Q

What do ALTN and MANUAL indicate on cabin pressurization controller? What causes illumination?

A

ALTN
Pressurization system operating in alternate mode
Selected manually or automatically
–Automatically if AUTO FAIL, automatic transfer to ALTN

MANUAL
Manual control of outflow valve
Illuminated if MAN selected on pressurization controller

31
Q

What does the pressurization mode selector do?

A

Selects cabins pressure controller mode

AUTO, ALTN, or MAN

32
Q

Describe the 3 temperature control zones

A

Controls temperature for CONT CAB, FWD CAB, AFT CAB
–Flight deck, forward cabin, aft cabin
–Coldest requested zone temp controls pack temp
–Trim air makes up heat difference in other zones
–65F to 85F full cold to full hot
–OFF – Left pack to 75F, Right pack to 65F

Two zone temperature controllers
–Left controller for aft cabin and backup for flight deck
–Right controller for forward cabin and primary flight deck

33
Q

What does an illuminated ZONE TEMP light indicate?

A

CONT CAB ZONE TEMP (flight deck)
-Supply duct overheat, or
-Failure of both temperature controllers, or
-During recall, failure of one controller

FWD/AFT CAB ZONE TEMP
-Supply duct overheat, or
-During recall, failure of respective temperature control

34
Q

What happens with MASTER CAUTION when ZONE TEMP illuminates?

A

Immediately for
-Supply duct overheat, or
-Failure of both zone temp controllers (CONT CAB ZONE TEMP only)

On Recall for
-Failure of one zone temp controller (CONT CAB ZONE TEMP)
-Failure of FWD/AFT temp control (FWD/AFT CAB ZONE TEMP)

35
Q

What is the purpose of the Mix Manifold?

A

Mixes recirculated air with conditioned air from the Packs

36
Q

What do FLT ALT and LAND ALT indicate on the pressurization panel? Indications and impacts of panel failure?

A

FLT ALT - intended cruising altitude
LAND ALT - elevation of intended landing airport

Panel failure 88888 or —–
Panel may still be operating with 8s, probably not with —
Monitor cabin

37
Q

What is indicated by CABIN ALTITUDE warning lights and warning horn? Can the horn be silenced?

A

Cabin altitude > 10,000’ +/- 1,000’

Intermittent horn, same as T/O configuration warning!

ALT HORN CUTOUT on overhead panel

NEW Alaska B737 Systems (16 decks)

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