Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Boeing 757 Systems > Air > Flashcards

Air Flashcards

Learn the Air System

1
Q

Why would the Compartment Temperature Inoperative (INOP) Lights Illuminate

A
  • fault in the zone temperature controller
  • Compartment Temperature Control is OFF
  • the trim air switch is OFF
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Describe the AUTO position of the Compartment Temperature Controls

A
  1. automatic compartment temp control
  2. pack output temperature is determined
    by the cabin temperature controller.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What does the OFF position do concerning the Compartment Temperature Control?

A
  • closes the compartment trim air valve

* the compartment temperature INOP light illuminates

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

TRIM AIR Switch ON/OFF

What occurs in each position?

A

ON – the trim air valve is commanded
open.
Off – the trim air valve is commanded
closed.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Trim Air OFF Light Illuminated (amber) Why?

A

The TRIM AIR switch is off.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

PACK RESET Switches. Why use them?

A

Resets an overheated pack if the pack has cooled to a temperature below the overheat level.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Pack INOP Lights. Why illuminated?

A
  • the pack is overheated

* fault in the automatic control system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Pack Off Light?

A

PACK VALVE Closed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

PACK Control Selectors

OFF or AUTO Describe each position.

A

OFF—-closes the pack valve.

AUTO– the pack is automatically controlled.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

PACK Control Selectors

STBY MODE

A
  • N (normal) – constant, moderate temp
  • C (cool) – full cold operation
  • W (warm) – full warm operation
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

FOOT HEATERS Switch

A
  • HIGH – operates on high setting(inflight)
  • LOW – operates on low setting.
  • OFF – is not operating
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Which FOOT HEATER position will only work inflight only?

A

The High Position

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Which SHOULDER HEATER position will only work inflight?

A

The High Position

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What will cause the Equipment Cooling SMOKE Light to illuminate?

A

Smoke is detected in the forward equipment cooling ducts.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Describe the Alternate (ALTN) Equipment Cooling Switch

A
  1. activates the alternate supply fan
  2. On the 757-200ER activates the
    auxiliary fan, if the alternate supply fan fails.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

The Equipment Cooling Overheat (OVHT) Light illuminates for 3 reasons.

A
  • insufficient airflow (on the ground)
  • the supply fan is inoperative
  • the alternate supply fan is inoperative
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

When you rotate the Cabin Altitude AUTO RATE Control

A

You are setting a limit for cabin altitude rate of climb or descent during auto control.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is the function of the DETENT position?

A

Establish an approximately 500 fpm climb and 300 fpm descent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What has happened when you see AUTO Inoperative (INOP) Light

A

Either:
AUTO 1 and AUTO 2 cabin altitude control functions are inoperative or,
MAN mode is selected

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Cabin Altitude MODE SELECTOR

Auto 1

A

Auto 1 –
• activates Auto 1 cabin altitude control for
automatic operation
• outflow valve positioned automatically

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Cabin Altitude MODE SELECTOR

AUTO 2

A

Auto 2 –
• activates Auto 2 cabin altitude control for
automatic operation
• outflow valve positioned automatically

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

When you select MANUAL on the Cabin Altitude MODE SELECTOR, what happens?

A

• outflow valve position is controlled by the
cabin altitude MANUAL control
• AUTO INOP light illuminates

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What is the takeoff and landing Cabin differential pressure limit/placard?

A

.125 PSI

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

The CABIN ALTITUDE light illuminates for what reason?

A

• cabin altitude exceeds 10,000 feet
• extinguishes when cabin altitude
descends below 8,500 feet.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

What is the function of the High Altitude Landing Switch?

A

Reprograms system logic to initiate AUAL and VISUAL alerts at 14,650’ instead of 10,000’

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

why would the High Altitude Landing Inoperative light illuminate?

A

The High Altitude Landing System is failed.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

what is the purpose of the Bleed Air System Isolation Switch?

A

To open or close the ISOLATION VALVE.

28
Q

If you notice the ISOLATION VALVE light, what is occurring?

A

The isolation valve position disagrees with the commanded position.

29
Q

The engine BLEED AIR switches open when?

A

They open when engine bleed air is available. Pneumatic actuated.

30
Q

What are the 3 reasons the Engine Bleed Air OFF light illuminate?

A

The engine bleed air valve is closed:
• automatically due to a system fault
• the switch is OFF
• the engine is not running

31
Q

Why would a DUCT LEAK Light occur?

A

A high temperature bleed air leak is detected.

32
Q

Why would a BLEED Light occur?

A

The engine bleed air temperature is excessive.

33
Q

Why would a HI STAGE Light occur?

A

Engine bleed system pressure is excessive or
the engine high pressure bleed air valve
is automatically locked closed.

34
Q

What would cause a APU Bleed Air VALVE Light to Illuminate (amber)

A

APU bleed air valve position disagrees with commanded position.

35
Q

How many temperature zones in the 757

A

Three, Flight Deck and two Cabin zones.

36
Q

How is zone temperature satisfied?

A

Zone temperature is then satisfied

by the zone temperature controllers using trim air.

37
Q

What occurs when there is an internal pack overheat?

A

The pack valve closes and the pack is shut down automatically.

38
Q

During an internal pack overheat what lights will you see?

A

The PACK OFF light illuminates.
EICAS advisory L or R PACK OFF
PACK TEMP indications.

39
Q

What happens when you shut off the LEFT RECIRC FAN?

A

The overboard exhaust valve will open. Maintenance action is then required

40
Q

Why turn off the RIGHT RECIRC FAN?

A

To provide a more rapis exchange of air.

41
Q

Where does the Flight Deck get its air?

A

From the LEFT PACK only.

42
Q

Where does the Flight Deck get its air if the LEFT PACK has failed?

A

The flight deck receives air from the mix manifold.

43
Q

How much does our Fuel Flow increase with a fan off?

A

.3%

44
Q

How does the FORWARD E/E system get cool?

A

The left recirculation fan draws air through the forward E/E system and returns it
to the mix manifold.

45
Q

What happens if the TRIM AIR system is off?

A

The packs attempt to maintain all

compartments at an average temperature.

46
Q

How does the forward equipment cooling system work?

A

The system has a supply fan that
draws cooling air from the cabin and forces it through the equipment racks and
avionics.

47
Q

After the forward equipment is cooled, where does the air go?

A

The air is then exhausted into the air conditioning mix manifold by the
left recirculation fan.

48
Q

What occurs while the forward equipment is cooled and there is a low differential pressure?

A

The overboard exhaust valve automatically opens and most of the air is exhausted overboard.

49
Q

What lights will you view if a supply fan fails?

A

Equipment cooling OVHT light illuminates

EICAS advisory EQPT OVHT displays

50
Q

What should be done after the supply fan fails?

A

Pushing the ALTN EQUIP COOLING switch,

an alternate supply fan is activated

51
Q

What happened if the OVHT light illuminates after the ALTN Fan was in operation?

A

The alternate supply fan failed.
(The OVHT light re-illuminates)
(EQPT OVHT message re-displays)

52
Q

The 757-200ER has what backup for cooling of the ESSENTIAL avionics and electrical equipment

A

If both supply fans are inoperative
an auxiliary fan automatically operates to provide cooling for essential avionics
and electrical equipment.

53
Q

In the 757-200ER what is the backup power source?

A

The hydraulic driven generator.

54
Q

The 757-200ER has what feature on the ground concerning inadequate cooling airflow?

A

On the ground, the OVHT light illuminates, the EQPT OVHT message displays
and the ground crew call horn sounds if insufficient cooling airflow is detected.

55
Q

What happens when smoke is detected in the equipment cooling system?

A

SMOKE light illuminates.

EICAS advisory FWD EQPT SMOKE displays when smoke is detected in the equipment cooling system.

56
Q

What happens automatically when smoke is detected in the equipment cooling system?

A
  • one or both recirculation fans turn off
  • one or both AC packs switch to high flow
  • the overboard exhaust valve opens
57
Q

How would you describe the cargo heat system?

A

Completely automatic.

58
Q

What protects the fuselage from excessive pressure differential?

A

Positive pressure relief valves and negative pressure relief valves operate
independently from the pressurization control system to protect the fuselage
against excessive pressure differential.

59
Q

Whwn will the CABIN ALT and CABIN ALTITUDE lights illuminate while the HIGH ALTITUDE LDG switch is on?

A

If the cabin altitude climbs above 14,650 feet . The lights extinguish and the EICAS message blanks when the cabin altitude descends below 11,800 feet.

60
Q

Describe the aneroid switch.

A

Automatically closes the outflow valve when the cabin altitude exceeds 11,000 feet. Some models are auto and manual mode. Some models are auto only.

61
Q

APU air is available up to __________feet.

A

17,000 feet

62
Q

When would the BLEED ISOLATION be open?

A

Engine start

Single bleed source operation

63
Q

Whay would you see a L or R BLD DUCT LEAK?

A

A high temperature bleed air leak is detected

64
Q

What is the cause of a BLEED light on a 757?

How many resets allowed?

A

BLEED LIGHTS:
- 757: “Bleed” = over temperature

(1 reset allowed)

65
Q

What is the cause of a High Stage light on a 757?

How many rests?

A

“High Stage” = over pressure

No reset

Boeing 757 Systems (17 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions