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P-8 > Environmental Control System > Flashcards

Environmental Control System Flashcards

(74 cards)

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1
Q

Sources of Bleed Air

A

Engine (5th Stage Compressor and 9th Stage Compressor)
APU
External Air Cart/Source

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2
Q

When is 9th Stage engine compressor air used rather than 5th?

A

Supplements if the low pressure compressor is insufficient

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3
Q

When is the APU Bleed Air Valve open?

A

APU is Online
Switch is Open
Below 17,000’ MSL

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4
Q

What is needed to open the APU bleed valve open?

A

DC and Pneumatic Pressure.

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5
Q

Where is External Air connected?

A

Right Wing Root
High Pressure Air at the pneumatic ground connection forward of the right PACK access panel
Condition air is forward of the pneumatic ground connection

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6
Q

What does the bleed Trip Sensor do?

A

Monitors for bleed air temperature or pressure exceedance. Automatically closes the valve if so.

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7
Q

What do the pressure regulator and shutoff valve do?

A

Maintain operating pressure and reduce bleed air outflow in response to high bleed air temperature.

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8
Q

How are the pressure regulator and shutoff valve controlled?

A

DC activated and pressure operated

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9
Q

What do Duct Pressure Transmitters do?

A

Bleed air indications

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10
Q

Is it normal for a split in left and right bleed air?

A

Yes if there is normal cabin pressure

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11
Q

What is the point of the isolation valve?

A

Prevents single duct failure from causing entire bleed manifold loosing pressure

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12
Q

What powers the Isolation Valve?

A

AC Power

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13
Q

What happens with the Isolation valve in Auto?

A

If both bleeds and packs are on, its closed.
If either bleed or pack is off, its open

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14
Q

Dual Bleed Light meaning

A

APU Bleed air valve is open with No1 bleed air switch on or No2 bleed air switch on with isolation valve open.

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15
Q

Why is dual bleed bad?

A

Back pressure of the APU

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16
Q

Dual Bleed limit

A

Do not advance thrust levers above idle

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17
Q

Left Wing Body Overheat Light

A

Left Engine Strut
Left Inboard Wing Leading Edge
Left Hand Air Conditioning Bay
Keel Beam
Bleed Duct from APU

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18
Q

Right Wing Body Overheat Light

A

Right Engine Strut
Right Inboard Wing Leading Edge
Right Hand Air Conditioning Bay

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19
Q

What does wing body overheat mean?

A
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20
Q

How to tell the difference between an actual wing body overheat and a short circuit?

A

No difference

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21
Q

Where are the PACKS

A

Wing Center Section

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22
Q

Parts of the PACK

A

Ram door and inlet
2 Wheel Air Cycle Machine
Primary and secondary heat exchanger
Water Separator
Control Valve
Exhaust duct

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23
Q

PACK Flow

A

Air from the pneumatic system
Conditioned
Cold air combined with mix manifold
Final temperature is achieved by regulating pneumatic system air into distributed airflow

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24
Q

Where does the flight deck air come from

A

Left pack or after mix manifold

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25
How many packs can the APU control?
2 on the ground 1 in flight
26
How many packs can the external ground cart control
Both
27
How many packs can be run from 1 engine?
1. Single pack can pressurize and keep temperature up to 41,000' in high
28
What is commanded when the pack switch is in auto?
If both online, low. If one is online on the engine, high flow commanded with flaps up. If on APU with both engine bleeds off, high flow commanded
29
How to get max airflow on the ground
APU bleed on One or both backs in high
30
When do you get high airflow?
-One or both packs on high -On ground, both packs in auto, Engine bleeds off, APU bleed air on -One pack with flaps up with bleed air on and APU off or APU bleed on and engines off -PACK Overheat with flaps up
31
What is the purpose of RAM air?
Cooling air for the heat exchange
32
When is ram air fully open
On the ground, slow flight with flaps extended
33
When does ram air modulate?
Normal operatioins
34
What is the cooling cycle?
Bleed air, heat exchanger for cooling, air cycle machine for refrigeration, combined with hot air bypassed air cycle, high pressure water separator, mix manifold and distribution system
35
How many controllers are there for cooling?
2, primary and standby
36
What if you get a pack light on recall only?
Primary or standby has failed, not both
37
Pack Light meaning
Both primary and standby controller failed. Continue to operate without control until excessive temperature is reached
38
What temperature can you control the zones to?
65-85 degrees farenheit
39
How many zones are there for temperature control
3. Flight deck, forward cabin, aft cabin
40
What temperature do the packs control the air to?
Coldest temperature selected
41
What happens if you are on single pack with trim air off?
PACK produces to the average of the three temperatures
42
ZONE TEMP light meaning
Zone supply duct overheat. Trim air is modulating the valve closed. This can be reopened after valve has cooled with a trip reset.
43
What does the left zone temperature controller control?
Aft cabin zone and backs up the flight deck control
44
What does the right zone temperature controller control?
Forward cabin and is the primary fight deck zones
45
CONT CAB and ZONE TEMP on recall
Primary has failed
46
ZONE TEMP on recall
Forward or aft cabin temperature control valve failed. Associated trim air modulating valve is closed and averages the two temperatures
47
What is an unbalanced pack temperature control mode?
Failure of affecting supply of trim air. Temperature control system control both packs independently
48
How are temperatures controlled in unbalanced pack temperature control mode?
Flight deck fails - Left pack controls the flight deck. Right pack cools the zone that requires the most cooling Cabin or both fail - forward and aft are averaged for the right pack If any zone if selected off - Temperature selector setting is ignored
49
What happens if all temperatures are selected off?
Left is at 75 degrees. Right is at 65 degrees
50
Flight Deck A/C distribution
Directly from the left pack before the mix manifold Electrical and electronic exhaust system (draws air into the flight deck and draws old air out) Out from under seat, flight deck ceiling, above and aft no 3. window, and behind the rudder pedals
51
Mission Crew A/C Flow
Mix Manifold air Sidewall riser to supply air to overhead distribution duct Overheat distribution duct routs air Pulled out through the draw through system to the forward lobe where its redistributed, aft lobe with the outflow valve.
52
Recircultion Fan purpose
Reduce pack load and bleed air demand
53
Where are the recirculation fans located?
Flight Crew/EE Bay - Forward cargo bay is filtered and recirculated to the mix manifold. Crew - Forward lobe
54
When are the recirculation fans on in flight
Both PACKs in Auto - Both on One PACK in High - Left off Both PACKs in High - Both Off
55
When are the recirculation fans on on the ground?
PACKs in Auto, off or one is in High - Both are on Both PACKS in High - Left fan off
56
What if the primary equipment cooling fails?
Off light Select the standby and the light will extinguish within 5 minutes
57
What if both primary and secondary equipment cooling fail?
Off light will remain on Lose pilot display in 30 minutes. Lose copilot display in over 30 minutes
58
Valves for Pressurization
Negative Pressure relief valve Pressure Relief valve Outflow Valve Overboard Exhaust Valve
59
Max Pressure Differential
9.1
60
Purpose of Negative Relief Valve
Prevent outside pressure from being greater than inside
61
Outflow Valve Locations
Drawn through foot level grills and aft lower lobe (used for heating)
62
When is the overboard exhaust valve closed
High delta p. Exhaust air is diffused to forward lower lobe
63
When is overboard exhaust valve open
On the ground and in flight with low delta p. Warm air from the EE discharged. With the pack in high and the right recirculation fan off, it increased ventilation for smoke removal
64
Modes for the Cabin pressure controller
Auto, Alternate and Manual
65
Cabin Pressure Controller Power Source
DC
66
Sensors for pressure calculation
ADIRU - Ambient static pressure, baro corrected altitude, non corrected altitude and calibrated airspeed Stall Management Computer - Throttle Position and Air Ground Sensor
67
How many pressurization controllers are there in Auto
2. Alternate which is primary and standby
68
Process for pressurization
Takeoff Altitude fed to auto controller Begin pressurization at high throttle setting for a gradual transition Calculates the minimum cabin altitude change rate
69
OFF SCHEDULE DESCENT
Auto Reverts to land at takeoff altitude if preprogramed cruise altitude is not reached. The auto revert is deleted if flight altitude is changed
70
Pressurization Cruise Mode Pressure Differential
Landing altitude or 7.45 below 28,000', 7.8 between 28,000' and 37,000', or 8.35 above 37,000'. Whichever is lower
71
Pressurization Descent Mode Conditions
.25 delta p decrease Land slightly pressurized and fully open the valve when taxiing in
72
AUTO FAIL pressurization light
Loss of DC Power Controller Fault Outflow Valve Fault Delta P is greater than 8.75 if controller is not responding +- 2,000' fpm pressurization change High Cabin Altitude (15,800')
73
Manual Pressurization Time for full range
20 seconds
74
Manual Pressurization Controller Power
Standby DC System

P-8 (15 decks)

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