Brainscape's Knowledge GenomeTM

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


See full index

From Flashcardlet > FCOM VOL2 Air Systems > Flashcards

FCOM VOL2 Air Systems Flashcards

0
Q

What function does the Auto have on the isolation valve switch?

A

Closes the isolation valve when both Bleeds and packs are on ( high or Auto).
Opens the isolation valve if either bleed or aircon pack is positioned off.

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

What does the dual Bleed light indicate?

A

The APU bleed is on along with either engine bleed.

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

What does illumination of the left wing body overheat light indicate?

A

Indicates a overheat from a leak in the bleed air duct in either the left engine strut, left inboard leading edge, the left air conditioning bay, keel beam or APU bleed duct.

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

What is indicated by illumination of the right wing body over heat light?

A

A overheat detected in the bleed air duct in either the right engine strut, the right inboard leading edge or the right air conditioning ba.

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

What does the wing body overheat test switch do?

A
  • Tests wing body over heat detector circuits,

- illuminates both wing body over heat lights.

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

What does the bleed trip off light indicate?

A

Either temp or pressure excessive,

Related bleed air valve shuts off automatically, requires reset.

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

What does the trip reset do?

A

Resets Bleed trip off, Pack or zone temp lights.

The related bleed valve opens, pack valve opens and the related trim air modulating valve opens.

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

Where does bleed air come from?

A

Stage 5 and stage 9 compressors, when air from 5 is insufficient stage 9 modulates open to supply demand.

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

What powers the engine bleed valves?

A

DC power

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

Is it ok for there to be a split in the Duct pressure gauge?

A

Yes a split is considered normal provided cabin pressure is sufficient.

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

What does does the left electronic temp controller control?

A

It is the standby for the flight deck and controls temp in the aft cabin.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What does the right temp controller control?

A

Primary controller for flight deck and controls forward cabin zone.
If this temp controller fails, temperature control will switch automatically to the left controller. This will illuminate the “ cont cab” zone temp light on recall.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What systems rely on bleed air to operate?

A

Pressurisation, wing and engine thermal engine anti icing, engine starting, hydraulic reservoir pressurisation, Aspirated TAT probe and water tank pressurisation.

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

Is the bleed air valve powered by AC or DC power?

A

DC.

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

What powers the duct pressure indicators? Is it considered normal to have a split?

A

AC power. Yes provided there is sufficient air for cabin pressurisation.

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

With the isolation valve switch in auto what cause it to open?

A

If either a bleed air switch or pack switch is selected off.

isolation valve is not affected by the position of the APU bleed switch

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What must be observed with dual need light illuminated?

A

Idle thrust only as their is a danger of backpressure of the APU.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Where does conditioned air for the flight deck come from?

A

Left pack, upstream of the mix manifold.

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

Where does conditioned air for the cabin come from? Where does it enter cabin?

A

Excess from left pack, air from right pack and air from re circulation system is combined in the mix manifold. Enters the cabin through left and right side wall risers.

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

Can the APU provide enough bleed air for both packs?

A

On ground only, not in air.

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

With both packs in auto what happens when one stops working?

A

The operation pack operations in high flow to provide adequate ventilation as long as flaps are up.

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

Why is the automatic switching to high high flow inhibited with the flaps down?

A

To ensure adequate engine power for single engine operation.

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

With both engine bleed air switches off will the the packs automatically switch to high flow?

A

Yes with the APU bleed air on, regardless of flap position, air or ground and regardless of number of packs operating.

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

What do the ram air doors do?

A

Provide cooling for heat exchangers.

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

When would you expect to see the blue RAM DOOR FULL OPEN LIGHT illuminated?

A

On ground or slow flight with flaps not fully retracted.

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

What prevents slush entering ram air system?

A

Electrically operated deflector doors. Controlled by the air ground system.

26
Q

Describe the cooling cycle?

A

Bleed air passes through the heat exchanger then enters air cycle machine (ACM) for refrigeration then combine with hot air which has bypassed the ACM passes through the high pressure water separator enters the mix manifold distribution system.

27
Q

How is overheat protection provided in the air conditioning system?

A

Overheat protection provided in the cooling cycle. If O/H detected associated pack valve will close and PACK light will illuminate

28
Q

How many pack controllers for each pack?

A

2 primary and standby

29
Q

Will the failure of the primary pack controller generate a master caution?

A

No only on recall, however if both primary and standby pack controllers fail the master caution will automatically illuminate.

30
Q

What can cause the pack light to illuminate?

A

A failure of either or both pack controllers or an over temperature condition.

31
Q

Can you continue at your current cruise altitude with a pack failure.

A

Yes single pack operation is certified up to max cruise altitude. However if unable to maintain pressurisation then descend to lower altitude. Check fuel reqd.

32
Q

What is the temp range for zone temp selectors?

A

18-30’C

33
Q

In normal conditions what temp do the packs produce?

A

A temperature that satisfies the zone that requires the most cooling.

34
Q

During single pack operation with trim air switch off what temperature does the pack try to achieve?

A

An average of all 3 zones.

If the trim air switch is on it behave the same as twin pack operations.

35
Q

What is indicated by a ZONE TEMP light illuminating? What happens?

A

Zone supply duct has over heated, the associated trim air modulating valve closes.

36
Q

What zones does the left electronic controller provide temperature control for?

A

The aft zone, and a back up for the flight deck zone

37
Q

The right electronic temp controller provides control for which zones?

A

Forward cabin zone and primary controller for flight deck.

38
Q

What happens when the primary temp controller for flight deck fails?

A

Automatically switches to the back up controller and on recall will get master caution cont cab zone temp light.

39
Q

A failure of either the forward or aft temp controller causes what?

A

Associated trim air modulating valve closes, the temp selectors still operates normally but works on an average of the two zones.

40
Q

What happens during unbalanced pack temperature operations?

A

If flight deck trim air is lost left pack provides conditioned air for flight deck at selected temp and right pack will satisfy cabin temp zone which requires most cooling.
If a pax trim air zone or all trim air is lost the forward and aft temp zones will be averaged from right pack.

41
Q

If all temp selectors are positioned off what temp will the left and right packs put out?

A

Left pack 24degrees

Right pack 18degrees.

42
Q

What is the purpose of the recirculated fans?

A

Reduce load on packs and engine bleed air demand

43
Q

In flight which recirc fans operate?

A

Left fan operates if both packs are operating unless either pack switch is in high.
The right fan operates if both packs are operating unless both pack switches are in high.

44
Q

On ground which recirc fans operate?

A

Left fan operates unless both pack switches are in high,

Right fan operates even if both pack switches are in high.

45
Q

Describe the equipment cooling system?

A

Consists of supply duct and exhaust duct,
Supply provide cool air for flight deck displays, electronic equipment and e&e bay.
Exhaust draws warm air away from these areas.
Both supply and exhaust have normal and alternate fans.

46
Q

When is the equipment cooling exhaust OFF inhibited?

A

In event of forward cargo fire, exhaust fan is shut off and light inhibited.

47
Q

After selecting either alternate equipment cooling or exhaust fans how long will it take for the OFF light to go out?

A

5secs

48
Q

With regards to equipment cooling, what warning is provided for an over temp on the ground?

A

The crew nose wheel call horn will sound.

49
Q

What provides extra heating for forward cargo compartment?

A

When the overboard exhaust is closed, exhaust air from equip cooling is diffused through long of forward cargo.

50
Q

How many pressurisation controllers are there?

A

3, auto and altn which are identical and alternated automatically every flight and manual.

51
Q

How many pressure relief vales are there?

A

2 with max differential pressure 9.1.

There is also a negative pressure relief valve to prevent external atmospheric pressure exceeding cabin pressure.

52
Q

What powers the pressurisation controllers?

A

DC motors.

53
Q

What cabin altitude can you expect at an altitude of 41000ft

A

8000ft

54
Q

What do the air data inertial reference units provide the automatic pressurisation controllers?

A

Ambient static pressure, baro corrected altitude, non-corrected altitude and calibrated airspeed.

55
Q

How is pressurisation outflow controlled?

A

Outflow valve and also a small amount exhausted through galley and toilet vents and leakage.

56
Q

When does the cabin begin to pressurise?

A

On ground at higher power settings, this is to smooth out the transition to pressurised flight after take off.

57
Q

When is pressurisation cruise mode achieved?

A

When the cabin differential gets to within 0.25 psi of selected flt alt.

58
Q

When is pressurisation descent mode activated?

A

When a/c descends 0.25 below selected flt altitude.

59
Q

What causes the Amber auto fail light to illuminate?

A

Loss of DC power, controller fault, outflow valve control fault.
Excessive differential pressure (>8.75psi)*
Excessive rate of cabin change (>2000fpm)*
High cabin altitude (above 15800ft)*
*= if controller not responding properly.

60
Q

What does moving the pressurisation mode controller to altn do?

A

Should have switched automatically so the only thing that will change is the AUTO FAIL light should extinguish.

61
Q

How long does it take to open the out flow valve for fully closed position in manual mode?

A

20seconds

62
Q

What powers the manual pressurisation controller?

A

DC motor power by the standby DC system which is slower than the automatic system.

From Flashcardlet (20 decks)

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