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Air Conditioning And Pressurization Flashcards

0
Q

What controls the ram air regulating valve(RAVR)

A

The air conditioning system controllers

ACSC’s

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1
Q

ACSC

A

Air conditioning system controllers

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2
Q

In the event of dual pack failure what provides air

A

Ram air switchlight

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3
Q

Using the ram air switch light the air enters which supply system

A

The left supply system

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4
Q

How many avionic cooling fans

A

Fan 1 … Operates during flight or on the ground as alternate

Fan2… Operates on the ground or in flight as alternate

Standby fan operates as backup

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5
Q

When smoke is detected in the cargo bay

A

The heater power is removed and the shut off valves automatically close

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6
Q

How many Galley heaters do we have

A

Two 500 W heaters to supply heat to the galley and Service door area

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7
Q

Cabin pressure is maintained and controlled by

A

1 electro pneumatic outflow valves

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8
Q

If cabin altitude exceeds 14,000 feet

A

Passenger oxygen masks deploy

3-13

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9
Q

The outflow valves are automatically controlled by

A

Either of two independent Cabin pressure controllers

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10
Q

How many CPC’s

A

2

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11
Q

The pressure controller automatically switches on the ground when

A

On the ground for three minutes

The active CPC is displayed on the ECS synoptic page

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12
Q

EMER DEPRESS

A

Opens bothoutflow valves

14500 +-500

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13
Q

FASTEN SEATBELT SIGN

and

NO SMOKING SIGN

comes on automatically when

A

Cabin altitude is at or above 8500 feet

Px sign in auto

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14
Q

Do we have a CPAM

A

No

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15
Q

Amber fault light on one of the packs?

A

Failed in both auto and manual

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16
Q

Amber fault lt on the PRESS CONT Switch?

A

Both cabin pressure controllers have failed

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17
Q

When is pressurization data shown on the primary page

A

When in manual mode

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18
Q

What cools packs

A

Ram air

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19
Q

Ram air also provides cooling airflow to

A

Cooling of number one and two hydraulic system fluids

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20
Q

How many recirc fans

A

2

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21
Q

Test question

Low-pressure compressed air from a ground air conditioning cart can be supplied directly to

A

Into the flight and passenger compartment distribution systems

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22
Q

What are the two avionics exhaust fans used for

A

To extract the heated air from behind the flight compartment displays and from the avionics equipment

On the ground the heated air is dumped overboard through the ground outflow valve

Inflight the heated air is ducted to the pressurization outflow valve and dumped overboard

8-30-1 mes psm

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23
Q

OVBD COOL FAIL status?

A

“Overboard exhaust shutoff valve Has failed closed with the aircraft on the ground and the passenger door unlatched” QRH definition

  • Ground valve fails to open after touchdown— SYS 3-24
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24
OVBD COOL caution
Over board exhaust shutoff valve is not closed with the passenger door and service door closed Aircraft will not pressurize
25
How many electrically controlled outflow valves regulate the cabin pressure
One!! This is a correction to a previous card
26
How many safety valves
Two... One for overpressure relief failedOne for negative pressure relief
27
Cabin altitude exceeds 14,000 feet
O2 masks deploy 14000 +-300
28
CABIN ALT WARNING
cabin altitude is greater than 10,000 feet
29
DIFF PRESS WARNING
differential pressure greater than 8.6 PSI
30
CABIN ALT caution
Cabin altitude is greater than 8500 feet but not greater than 10,000 feet
31
OVBD COOL caution?
Ground valve failed open with passenger and service door closed
32
What is the cabin altitude limitation regarding the pressurization system
The outflow valves will close to prevent The cabin from increasing above 14,500 +-500
33
Pressurization is controlled by
A single electric controlled outflow valve
34
ACSC stands for
Air conditioning system controller 2 ACSC's ``` #1 ... Left HPV. LCV ISOL #2....right HPV ``` 2 channels/controller 1 active /1standby No EICAS indication for activechnnel
35
ACSC PROVIDES ?
Ice protection 4 packs Auto shutdown 2 flowrates
36
PRSOV fail safe?
Closed
37
How many pressurization valves
1 Completely electric
38
What happens if both CPC's fail?
Outflow valves go to a barometric hold
39
Recirc fan off at what temp?
OFF if "cabin" temp is greater then 30 degrees
40
Ground valve functions in 2 Ways
Ensures aircraft is depressurized on the ground Allows avionic warm air to dump
41
FAULT. Lt on pack switch?
Failed in both auto and man modes Mes 8-20-3
42
Ram air passes over the packs for cooling and is then vented overboard thru
An exhaust vent on the lower aft fuselage
43
Where is px compartment exhaust air routed?
Underfloor to the outflow valves
44
Flt compartment exhaust air is routed?
Underfloor through the avionics compartment to the outflow valve
45
Display fans ?
( 2 display fans) 1 fan draws in air from the flight deck and mixes it w/ conditioned air and supplies it ti the back of the each display.
46
Avionics fans?
Used to extract heated air from bhind flt comp displays and from avionics equipment. In gnd .. Heated air dumped overboard .. Gnd valve In flt ... Outflow valve
47
Cargo switch .. Off pisition?
Both shutoff valves closed, system disabled
48
Air position?
Both shutoff valves open.. Recirc air keeps temp abv freezing
49
Cond air?
Both SOV open , heater enabled
50
Cabin altitude limitation?
Outflow valves close cabin altitude about 14,500 feet
51
What happens when either engine start switch light is pressed?
The pack. Valves automatically close Controlled by a ACSC
52
How many pressure schedules?
2 Normal pressure for two packs Increased pressure for one pack
53
FAULT light on the pack switch?
Pack has failed In both automatic and manual mode | left right pack caution
54
When should the recirc fan switch be selected to off?
When cabin temperature is warmer than 30°C
55
Recirc fans pool air from...
Cabin floor and returns it to mixing manifold
56
Are both forward and aft cargo bays pressurized?
Yes
57
Which cargo bay is ventilated by conditioned air?
Only the aft cargo bay
58
Aft cargo switch should not be selected to conditioned air when?
Ambient temps are above 15°C
59
How are all phases of pressurization controlled in the Auto mode?
Through two cabin pressure controllers Only one controller is active Switches three minutes after WOW
60
How many outflow valve?
1 Located on aft pressure bulkhead
61
How many safety valves?
2 Provide overpressure and negative pressure relief
62
How are the safety valves operated?
Pneumatically operated and spring loaded closed
63
What is the purpose of the ground valve?
Ensures aircraft is depressurized on ground Also dumps CRT and avionics air overboard
64
When do oxygen masks drop?
14,000 feet plus or -300
65
Cabin alt caution?
8500 feet
66
With a failure of the CPCP??
Auto oxygen mask deployments and illumination of fasten seatbelt and no smoking signs will not occur
67
2 display cooling fans..
Fan 1 gives cooling during flight Fan two gives cooling on the ground Standby:conditioned air cools displays ( no fan)
68
Cabin altitude limitation?
14500 +\- 500 The outflow valve will close to prevent an increase in cabin altitude
69
How many outflow valve's
1
70
How many safety valves
2 Overpressure Under pressure ( mechanical)
71
Are the cargo compartment pressurized
Yes
72
Maximum positive differential pressure
8.6
73
Negative differential pressure is limited to
-.5 psi
74
RAVR?
Ram air regulating valve Nornally open Status? Failed open or towards closed
75
Left pack auto fail master caution
Failure of respective pack in automatic mode... and system not in manual mode
76
Ram air enters which side
The left side
77
The flight compartment CRTs fans?
Avionics cooling fans Fan 1 operate during flight Fan 2 operates on the ground Standby fan as back up
78
Selecting STBY on the avionics cooling fan does what?
Permits conditioned air to ventilate the displays
79
Test: CARGO OVHT
cargo bay temperature greater than 35°C
80
Test: CARGO OVHT
cargo bay temperature greater than 35°C
81
SINGLE OUTFLOW VALVE!!!
SINGLE OUTFLOW VALVE!! 6/7/20
82
The packs are cntrolled by?
ACSC Air conditioning system controllers
83
Recirculation fan must be switched off when the cabin temperature is warmer than
30 degrees
84
AFT CARGO SWITCH?
Do not select conditioned air if ambient temperatures are above 15°C
85
In the avionics cooling system selecting standby on display cooling will?
Turn off fans to have conditioned air cool the displays
86
PACK MEANS?
Pneumatic air conditioning kit
87
FAULT LIGHT on pack switch?
Pack has failed in both automatic and manual mode 3-3 systems ac and press 6/7/20
88
ACSC 1 Controls the left pack ACSC 2 controls the rt pack
3-3 systems
89
There are two air-conditioning system controllers.. Each controller has?
Two parts one of which is active the other is standby and monitors
90
When a pack is operated in manual mode the selected temperature indicated for the associated pack is?
Removed from the ECS synoptic page
91
RAM AIR VALVE Allows air from the ram air scoop to enter the mixing Manifold For distribution to?
Both the flight deck and the passenger cabin 3-9 systems ac and press 6/7/20
92
The cargo conditioned air is controlled by?
ACSC2
93
How many safety valves? Operated?
There are two safety valves in the pressurization system pneumatically operated Spring loaded closed
94
At 8500 cabin alt
No smoking fasten seatbelt sign If in auto
95
Maximum differential pressure
8.6 +-.1 3-23 systems ac and press 6/7/20
96
Cargo htr temp?
70 - 80
97
FAULT lt on pack ?
Failed in both automatic and manual mode
98
Aft cargo been heater maintains what temperature
Between 70 to 80°F 3-14
99
Cargo overheat caution when temperature exceeds what temperature in the aft cargo compartment
95°F
100
What is used to cool the equipment in the avionics bay?
Exhaust air from the flight deck cabin and CRT displays 3–17
101
In manual mode, how is the outflow valve controlled?
Electrically by switches on the cabin press panel

Crj 900 (45 decks)

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