Air Flashcards

1
Q

What does the BLEED TRIP OFF (amber) light indicate?

A

Bleed trip sensors have automatically closed the engine bleed air valve, due to:

Excessively high engine bleed air temp (254C), or

Excessively high pressures (220 PSI)

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2
Q

Conditions permitting, the TRIP RESET switch resets which lights?

A

BLEED TRIP OFF

ZONE TEMP

PACK

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3
Q

How does the ISOLATION VALVE operate with its switch in AUTO?

A

Four corners in normal position –> closed

Otherwise –> open

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4
Q

What precautions apply with the APU bleed valve when an engine bleed valve is open?

A

Thrust must be limited to idle

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5
Q

When does the DUAL BLEED (amber) light illuminate?

A

APU bleed valve open, and one of the following:

Engine 1 bleed switch on, and/or

Engine 2 bleed switch on AND isolation valve open

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6
Q

What does the WING-BODY OVERHEAT (amber) light indicate?

A

An overheat has been detected:

Engine strut cavity, or 
Wing bleed air duct, or
Wing leading edge, or
Pack, or
Keel beam, or
Aft cargo compartment, or
APU cavity
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7
Q

A single pack in high flow mode is capable of maintaining pressurization and acceptable temperature throughout the aircraft up to what altitude?

A

Maximum certified ceiling

[41,000ft]

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8
Q

Which valve pneumatically modulates to control airflow into the respective air conditioning pack based on air condition demands?

A

Pack valve

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9
Q

When does a pack automatically switch to high airflow?

A

When one pack is not operating

[Inhibited on the ground or airborne with flaps extended]

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10
Q

How do the recirculation fans operate with both RECIRC FAN switches in AUTO, and both PACK switches in AUTO?

A

Both recirc fans would be on

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11
Q

Where do the air recirculation fans draw air from?

A

Collector shroud of forward cargo compartment,

Air conditioning distribution compartment (pack compartment), and

Floor grilles on each side of passenger cabin

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12
Q

What does ZONE TEMP (amber) indicate?

A

A supply duct overheat

[Trim air valve for that zone will close]

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13
Q

How do you position PACK switches when using external conditioned air?

A

PACK switches OFF

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14
Q

What controls the temperature of condition air from an external air source?

A

The external air conditioning cart

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15
Q

Packs produce air temperature to satisfy which zone?

A

The zone requesting the lowest temperature

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16
Q

What happens with the failure of the primary flight deck zone temperature control?

A

Master Caution Recall indicates failure of the flight deck temperature control and will cause an automatic switch to the backup control

17
Q

What temperatures are commanded by positioning all zone temperature selectors to OFF?

A

75F for the flight deck [left pack] and 65F for the cabin [right pack]

18
Q

What provides an equipment cooling alert if an overtemperature occurs on the ground?

A

EQUIP COOLING OFF (amber) light, and
MASTER CAUTION, and

Horn in the nose wheel well [ground only]

19
Q

What is the purpose of the overboard exhaust valve (OEV)?

A

Controls the quantity of equipment cooling exhaust air flowing overboard and has a smoke removal mode.

It closes when a differential pressure is achieved [~1psid]

20
Q

When is the outflow valve position indicator operational?

A

Anytime, regardless of the pressurization mode

21
Q

When does the OFF SCHED DESCENT (amber) illuminate?

A

Aircraft begins to descend without reaching the preset cruise altitude

[Within ~0.25 psid]

22
Q

How is pressurization controlled in MAN?

A

Manual control of the outflow valve

23
Q

What two warnings use the same aural tone (intermittent horn) when activated?

A

Takeoff configuration, and

Cabin altitude