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DL 7ER > Bleed Air Systems > Flashcards

Bleed Air Systems Flashcards

0
Q

Within the Compartment Temp Controls and Indicators, what does the OFF mode do?

A

Closes the compartment trim air valve, the compartment temperature INOP light illuminates. (Vol 2/2.10)

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1
Q

Within the Compartment Temp Controls and Indicators, what does the AUTO mode do?

A

Provides automatic compartment temperature control. (Vol 2/2.10)

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2
Q

On the 767 only, within the Compartment Temp Controls and Indicators, what does the MAN mode do?

A

Provides manual control of compartment trim air valve, spring loaded to the 6 o’clock position. (Vol 2/ 2.10)

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3
Q

What does an amber engine bleed OFF light mean?

A

Engine bleed air valve is closed:

  • automatically due to a system fault,
  • the switch is OFF,
  • the engine is not running. (Vol 2/ 2.10)
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4
Q

What are the indications of a dual auto pressurization controller failure?

A

AUTO INOP light illuminates amber, AUTO 1 and AUTO 2 cabin altitude control functions are inoperative. (Vol 2/ 2.10 and 2.20)

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5
Q

On a 767, what does an amber cargo heat OVHT light mean?

A

Cargo compartment temperature is above standard control range, and the shutoff valve signaled closed. (Vol 2/ 2.10)

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6
Q

What does the trim air system do?

A
  • adds warm air to the pack output air.
  • the pack controllers regulate the pack output air temp to satisfy the temp requirement of the compartment requiring the coldest air.
  • if the trim air system is off or INOP, the packs attempt to maintain all compartments at an average temperature. (Vol 2/ 2.10 and 2.20)
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7
Q

What does the TRIM AIR switch do?

A

ON- the trim air valve is commanded open.
Off (ON not visible)- the trim air valve is commanded closed.

(Vol 2/ 2.10 and 2.20)

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8
Q

What does the Trim Air OFF light mean?

A

When illuminated amber, the TRIM AIR switch is off. (Vol 2/ 2.10 and 2.20)

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9
Q

How does the gasper system work?

A

It draws air from the forward cabin overhead air conditioning ducts and discharges it from gasper outlets in the passenger service units located above each passenger seat. Gasper air is controlled by the GASPER fan switch. (Vol 2/ 2.20)

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10
Q

When must the landing altitude on the pressurization panel be reset?

A

During a destination change. (Vol 1/NP 20 Vol 2/2.20)

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11
Q

What is the purpose of the recirculation fans?

A

They maintain overall cabin circulation while allowing a reduction of cabin air ventilation, permitting the packs to be operated at a reduced flow. This reduced bleed air demand from the engines, reducing fuel burn. On the 757, the left recirculation fan should not be turned off because of its equipment cooling function. (Vol 2/2.20)

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12
Q

How do you manually control the cabin altitude?

A

Place the cabin altitude mode selector in MAN and rotate the cabin altitude MANUAL control to climb or descend. (Vol 2/2.10)

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13
Q

Where is the Bulk Cargo Heat Selector located?

A

It is located on the accessory panel (only on 767’s)

Vol 1/NP 20, Vol 2/2.10

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14
Q

What are the switch positions for the bulk cargo heat selector?

A

NORM- standard cargo heating range

VENT- provides a warmer compartment temperature than NORM, activates a fan in the bulk cargo compartment. (Vol 1/NP 20, Vol 2/2.10)

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15
Q

For all Delta operations, what is the preflight position for the BULK CARGO HEAT selector?

A

Vent. (Vol 1/NP 20 Vol 2/2.10)

16
Q

In the 767, what does the AUTO position do on the equipment cooling selector?

A

Automatically controls equipment cooling system.

Vol 2/2.10 and 2.20, QRH/2

17
Q

In the 767, what does the STBY position do on the equipment cooling selector?

A

Positions equipment cooling system for inboard air flow.

Vol 2/2.10 and 2.20, QRH/2

18
Q

In the 767, what does the OVRD position do on the equipment cooling selector?

A

Positions equipment cooling system for reverse air flow and arms the NO COOLING light.

(Vol 2/2.10 and 2.20, QRH/2)

19
Q

What does an amber illuminated PACK OFF light mean?

A

The pack valve is closed, and the pack is off. (Vol 2/2.10 and 2.20)

20
Q

What does an amber illuminated pack INOP light mean?

A

Either the pack is overheated, or there’s a fault in the automatic control system.

21
Q

What does an amber illuminated gasper OFF light mean?

A

The gasper fan switch is on, but the gasper fan is not operating. (Vol 2/ 2.10)

22
Q

What does an amber illuminated recirc fan INOP light mean?

A

Either the recirculation fan is failed or not operating, or the RECIRC FAN switch is off. (Vol 2/ 2.10)

23
Q

On a 757, what does an amber illuminated equipment cooling OVHT light mean?

A

Insufficient airflow due to:

  • either supply fan is inoperative, or
  • overboard exhaust valve is closed, with the left recirc fan failed or switched off. (Vol 2/ 2.10)
24
Q

On a 767, what does an amber illuminated equipment cooling OVHT light mean?

A

High temperature or low airflow in the equipment cooling system. (Vol 2/ 2.10)

25
Q

What does the OFF position on the pack control selector do?

A

Closes the pack valve. (Vol 2/ 2.10)

26
Q

What does the AUTO position on the pack control selector do?

A

The pack is automatically controlled. (Vol 2/ 2.10)

27
Q

What do the STANDBY positions on the pack control selector do?

A

N (normal)- regulates the pack outlet temp to a constant, moderate temperature.
C (cool)- sets the pack to full cold operation.
W (warm)- sets the pack to full warm operation.
NOTE: the automatic controller is bypassed in the standby position.

28
Q

What does a red CABIN ALTITUDE light on the overhead panel or a red CABIN ALT light on the center forward (discrete) panel signify?

A

Cabin altitude exceeds 10,000ft. Extinguishes when cabin altitude descends below 8,500ft. (Vol 2/ 2.10)

29
Q

How does the cabin altitude auto rate control work?

A

-only functions if AUTO 1 or AUTO 2 selected
-rotating sets limit for cabin altitude rate of climb/descent during auto control
-the index mark is the proper preflight position (+500fpm/-300fpm)
(Vol 2/ 2.10)

30
Q

On a 767, what does an amber illuminated NO COOLING light mean?

A

Light is only active when the switch is in OVRD mode.

Signifies that there is no reverse airflow through the E/E compartment avionics. (Vol 2/ 2.10)

31
Q

What does an amber illuminated compartment temperature INOP light mean?

A

-fault in the zone temperature controller
-the compartment temperature control is selected OFF
-the trim air switch is selected OFF
(Vol 2/ 2.10)

32
Q

Why is the center isolation (C ISLN) switch on the 767 guarded?

A

To protect the air source to the Air Driven Pump (ADP). (Vol 2/ 2.10)

33
Q

What does an amber illuminated DUCT LEAK light mean?

A

A high temperature bleed air leak is detected. (Vol 2/ 2.10)

34
Q

What does an illuminated BLEED light mean?

A

“Bleed air malfunction.” (Vol 2/ 2.10)

The engine bleed air temperature is excessive.

35
Q

What does an illuminated HI STAGE/ OVHT light mean?

A

“Bleed air malfunction.” (Vol 2/ 2.10)

The engine bleed system pressure is excessive. The engine high pressure bleed air valve is automatically closed.

DL 7ER (17 decks)

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