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757/767 MQB > Air Conditioning, Pressurization and Pneumatics/Bleed Air Systems > Flashcards

Air Conditioning, Pressurization and Pneumatics/Bleed Air Systems Flashcards

1
Q

The pack INOP light illuminates and a L or R PACK TEMP advisory displays for all pack control system faults and overheats. If the INOP light illuminates and remains illuminated after selecting STBY‐N for the affected pack, what is the fault?

A

A pack overheat. After the pack has cooled, an attempt to restore pack operation may be made by pushing the PACK RESET switch.

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2
Q

The pack INOP light illuminates and a L or R PACK TEMP advisory displays for all pack control system faults and overheats. In addition, the PACK OFF light illuminates and a L or R PACK OFF advisory displays when:

A

An internal pack overheat is detected. The pack valve closes and the pack is shut down automatically.

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3
Q

Pushing the Cargo Fire DEPR will cause:

A

One air conditioning pack to go to low flow and the other pack to shutdown. All conditioned air is shutoff to the cabin and diverted to the cockpit to supply fresh air to the crew.

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4
Q

What does a PACK OFF light and associated EICAS message indicate?

A

Respective pack valve closed

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5
Q

What can cause a Compartment Temperature INOP light to illuminate?

A

Zone air overheat or fault in zone temperature controller

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6
Q

What does the Cabin Altitude AUTO INOP light indicate?

A

Both Auto 1 and 2 are inoperative or manual mode selected

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7
Q

(757) Which condition automatically opens the overboard exhaust valve?

A

The recirculation fan fails

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8
Q

(RR) With the High Altitude Landing switch ON, what cabin altitude annunciates the CABIN ALTITUDE light and EICAS message?

A

14,650 ft

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9
Q

During automatic temperature control, which temperature zone controls the output temperature of the air conditioning packs?

A

The zone requiring the coolest air

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10
Q

What altitude setting is selected on the Landing Altitude Indicator during cockpit preparation?

A

Landing altitude in feet

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11
Q

What occurs if the Cabin Altitude Mode selector is set to AUTO 1 and it fails?

A

Control is automatically switched to Auto 2 controller

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12
Q

What could cause Compartment Temperature INOP lights to illuminate?

A

Trim air switch is OFF

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13
Q

What happens when an automatic control system fault or a pack outlet overheat is
detected?

A

The pack continues to operate in an uncontrolled,

degraded condition, requiring crew action

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14
Q

What does the Pack Reset switch do when pushed?

A

Resets an overheated pack if the pack has cooled to a

temperature below the overheat level

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15
Q

When a Pack Control selector is positioned to STBY N, what is the outlet
temperature of the pack in flight?

A

A constant, moderate temperature (40°F inflight)

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16
Q

What can cause a PACK OFF light to illuminate?

A

Pack valve is closed

17
Q

What cabin temperature do the packs attempt to maintain if the Trim Air switch is
selected OFF?

A

Maintain all compartments at an average temperature of

75°F (24°C)

18
Q

What is the purpose of Trim Air?

A

Hot trim air from the bleed air system is added to meet

the zone temperature requirements

19
Q

What crew action illuminates the AUTO INOP light on the Cabin Altitude Control
Panel?

A

Selecting MAN position on the Cabin Altitude Control

Panel

20
Q

What cabin altitude extinguishes the CABIN ALTITUDE light and EICAS message?

A

Cabin altitude below 8500 ft

21
Q

What are the expected pressurization limits for climbs and descents with Auto Rate
knob set at the index mark?

A

Climb ‐ 500 fpm; descent ‐ 300 fpm

22
Q

What condition(s) activate the ground call horn?

A

Insufficient equipment cooling airflow detected on the

ground

23
Q

(757) One forward equipment cooling system supply fan operates at a time. What
starts the alternate fan?

A

Selecting the Alternate Equipment Cooling switch to

ALTN

24
Q

(757) What occurs if ALTN is selected on the Alternate Equipment Cooling switch?

A

Activates the alternate supply fan and opens the

overboard exhaust valve if required

25
Q

(RR) With the High Altitude Landing switch OFF, what cabin altitude annunciates the
CABIN ALTITUDE light and EICAS message?

A

10,000 ft

26
Q

(767) What condition annunciates the Equipment Cooling VALVE light?

A

Equipment cooling valve(s) are not in the commanded

position(s)

27
Q

(767) What does the NO COOLING light indicate with OVRD selected on the
Equipment Cooling Panel?

A

No reverse airflow through the E/E compartment

28
Q

(767) What does the Equipment Cooling OVHT light indicate?

A

High temperature or low airflow in the equipment

cooling system

29
Q

(767) What does the Equipment Cooling SMOKE light indicate?

A

Smoke in the equipment cooling system

30
Q

(767) Selecting the Equipment Cooling selector to OVRD results in what equipment
cooling actions?

A

Opens smoke override valve and positions equipment

cooling system for reverse airflow

757/767 MQB (21 decks)

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