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4. Systems > 21. Air Conditioning / Pressurization & Ventilation > Flashcards

21. Air Conditioning / Pressurization & Ventilation Flashcards

1
Q
  1. (DSC-21-10) Hot air fault light illuminates on the air conditioning panel.

(a) The hot air press. reg. valve opens and the trim air valves close.
(b) The hot air press. reg. valve closes and the trim air valves open.
(c) The hot air press. reg. valve closes and the trim air valves close.
(d) The hot air press. reg. valve opens and the trim air valves open.

A

(c) The hot air press. reg. valve closes and the trim air valves close.

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2
Q
  1. (DSC-21-10) In case of zone controller primary and secondary channel failure, what temperatures are maintained by pack one and pack two;

(a) 15 deg.c. both.
(b) 25 deg.c. both.
(c) 20 deg.c. pack 1, 10 deg.c. pack 2.
(d) 24 deg.c. pack 1, 15 deg.c. pack 2.

A

(c) 20 deg.c. pack 1, 10 deg.c. pack 2.

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3
Q
  1. (DCS-21-30) In normal flight in closed circuit configuration, the avionics ventilation system controls the temperature of the cooling air by;

(a) Adding air-conditioned air to the flow.
(b) Extracting air overboard.
(c) Adding avionics bay air.
(d) Passing air through a skin heat exchanger.

A

(d) Passing air through a skin heat exchanger.

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4
Q
  1. (DSC-21-10) To enable Ram air to the mixer until, the Ram air switch should be used;

(a) At any time.
(b) Only when diff. Press. Is less then 1 psi.
(c) When press. Is greater then 1 psi.diff.
(d) Only after outflow valve is fully opened.

A

(b) Only when diff. Press. Is less then 1 psi.

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5
Q
  1. (DSC-21-10) Pack controller, primary channel failure;
    (a) The secondary computer operates as a back up mode and regulation is not optimised.
    (b) The secondary computer takes over (all functions as normal).
    (c) Pack is lost.
    (d) Pack outlet temp. Is controlled at 15 deg.c.
A

(a) The secondary computer operates as a back up mode and regulation is not optimised.

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6
Q
  1. (DSC-21-10) Pack controller, secondary channel failure;

(a) No effect on pack regulation back up mode is lost.
(b) Pack is lost.
(c) No effect (all modes still available).
(d) Pack outlet temp. Is controlled at 15 deg.c.

A

(a) No effect on pack regulation back up mode is lost.

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7
Q
  1. (DSC-21-10) Pack controller, primary and secondary channel failure;
    (a) Pack outlet temp. Is controlled at 5˚C to 30˚C in a maximum of 6 minutes by the anti-ice valve.
    (b) The pack is closed.
    (c) The packs deliver a fixed temperature of 20 deg.c.
    (d) Both packs are controlled to 24 deg.c.
A

(a) Pack outlet temp. Is controlled at 5˚C to 30˚C in a maximum of 6 minutes by the anti-ice valve.

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8
Q
  1. (DSC-21-10) Hot air press. reg. valve failed open;
    (a) Optimised regulation is lost.
    (b) The temperature stays at the value selected when the failure occurred.

(c) No effect.
(d) Cabin temperature will be controlled at the upper limit 30 deg.c.

A

(c) No effect

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9
Q
  1. (DSC-21-10) Bleed air supplied from the APU (apu bleed valve open), the pack flow is automatically selected;
    (a) High. (b) Normal. (c) Low. (d) Econ. flow.
A

(a) High.

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10
Q
  1. (DSC-21-10) Trim air valve, each one optimizes the temperature by;
    (a) Adding hot air. (b) Adding fresh air. (c) Modulation of pack flow.
    (d) Adding recirculated air.
A

(a) Adding hot air.

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11
Q
  1. (DSC-21-10) Hot air pressure regulating valve;
    (a) Regulates the pressure of hot air tapped upstream of the packs.

(b) Is spring loaded open in the absence of air.
(c) Opens automatically in case of duct overheat.
(d) Opens automatically if the cockpit trim air valve fails.

A

(a) Regulates the pressure of hot air tapped upstream of the packs.

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12
Q
  1. (DSC-21-10) Pack flow control valve;
    (a) Is pneumatically operated and electrically controlled.
    (b) Electrically operated and pneumatically controlled.
    (c) Opens automatically during engine starting. (d) Is spring loaded to open.
A

(a) Is pneumatically operated and electrically controlled.

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13
Q
  1. (DSC-21-10) The temperature selectors are located in;
    (a) The cockpit. (b) The cabin. (c) The avionics bay. (d) Only on the CIDS panel at the fwd. attendant station.
A

(a) The cockpit.

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14
Q
  1. (DSC-21-10) Pack flow may be selected from;
    (a) The cockpit. (b) The cabin. (c) The avionics bay. (d) Only the CIDS panel at the fwd. attendant station.
A

a) The cockpit

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15
Q
  1. (DSC-21-10) Engine pressure demand, when the cooling demand in one zone cannot be satisfied, if bleed pressure is low;
    (a) The minimum idle must be increased manually. (b) The minimum idle is increased automatically. (c) In any case, flight idle is sufficient. (d) The APU must be used to supply additional air.
A

(b) The minimum idle is increased automatically.

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16
Q
  1. (LIM-21-21-20) What is the Norm. Max. cabin altitude;
    (a) 8,000 ft. (b) 9,550 +/- 350 ft.
    (c) 14,000 ft. (d) 800 ft.
A

(a) 8,000 ft.

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17
Q
  1. (LIM-21-21-20) What is the Max. negative Diff. pressure for the cabin;
    (a) 0 psi.
    (b) -1 psi.
    (c) -2 psi.
    (d) -8.6 psi.
A

(b) -1 psi

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18
Q
  1. (LIM-21-21-10) Is it permissible to use simultaneously packs and Lp ground unit during long stops in a hot airfield;
    (a) Yes. (b) No. (c) Yes, if external temperature is greater than 50 deg.c. (d) Yes, provided the airflow supplied by the ground cart is less than 1.2 kg/s.
A

(b) No.

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19
Q
  1. (DSC-21-10) Trim air valves are modulated by;
    (a) The zone controller. (b) Anti-ice valve. (c) Hot air pressure regulating valve.
    (d) The pack controller.
A

(a) The zone controller.

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20
Q
  1. (DSC-21-10) The mixing unit is connected to;
    (a) Packs, Cabin air, emergency ram air inlet and Lp ground connector.

(b) Packs, emergency ram air inlet and Lp ground connector.
(c) Packs and cabin air.
(d) Pack 1 and pack 2 only.

A

(a) Packs, Cabin air, emergency ram air inlet and Lp ground connector.

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21
Q
  1. (DSC-21-10) Once set to ‘ON’ the air conditioning packs operate;
    (a) Automatically and independently of each other. (b) Normally, but the output of one affects the other. (c) Automatically, pack one as a master, pack two as a slave.
    (d) Automatically, pack two as a master, pack one as a slave.
A

(a) Automatically and independently of each other.

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22
Q
  1. (DSC-21-10) Emergency ram air inlet, when set to ‘ON’ the ram air valve will open and supply airflow;
    (a) In any case. (b) Diff. press. < 1 psi. and ditching not selected. (c) Provided ditching is not selected.
    (d) Provided ditching is selected.
A

(b) Diff. press. < 1 psi. and ditching not selected.

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23
Q
  1. (DSC-21-10) Zone controller fault (primary channel failure);
    (a) Cabin zone at fixed temp. (b) Packs at fixed temp. (c) Secondary channel operates as back up and operation is as normal. (d) The packs deliver a fixed temperature, 20 deg.c. pack 1 and 10 deg.c.pack 2.
A

(a) Cabin zone at fixed temp.

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24
Q
  1. (DSC-21-10) Conditioned air is distributed to;
    (a) Cockpit, cargo bays and cabin. (b) Cockpit, fwd. and aft. cabins. (c) Cockpit, avionics bay and cabin. (d) Cockpit, cabin and holds 1 & 2 only.
A

(b) Cockpit, fwd. and aft. cabins.

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25
Q
  1. (DSC-21-10) The cabin zone temperature sensors are ventilated by;
    (a) Air extracted by the lavatory and galley fans; (b) Air extracted from the avionics bay. (c) Temperature sensors are ventilated by ram air. (d) Temperature sensors are ventilated by discharge air to the outflow valve.
A

(a) Air extracted by the lavatory and galley fans;

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26
Q
  1. (DSC-21-10) Temperature control is automatic and is regulated by;
    (a) Zone controllers only. (b) Pack 1 and 2 controllers only. (c) Both the zone and pack 1 & 2 controllers.
    (d) The pack flow control valves only.
A

(c) Both the zone and pack 1 & 2 controllers.

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27
Q
  1. (DSC-21-10) If a pack controller fails, (primary and secondary channel failure), the pack outlet air temperature is controlled by;
    (a) Ram Air Valve (b) Hot Air Pressure Regulating Valve (c) Anti Ice Valve
    (d) Trim air valve
A

(c) Anti Ice Valve

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28
Q
  1. (DSC-21-10) The Zone Controller optimizes temperature by action on;
    (a) Pack anti ice valve. (b) Trim Air valve (c) Pack Flow control valve. (d) Hot air pressure regulating valve.
A

(b) Trim Air valve

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29
Q
  1. (DSC-21-10) When the pack flow control knob is positioned to HI, airflow is;
    (a) 80 % of normal.
    (b) 150 % of normal.
    (c) 120 % of normal.
    (d) 102 % of normal.
A

(c) 120 % of normal

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30
Q
  1. (DSC-21-10) When using APU bleed to supply the packs, with the pack flow selector at Lo, the pack airflow is;
    (a) 80 % of normal. (b) Normal. (c) 120 % of normal.
    (d) 102 % of normal.
A

(c) 120 % of normal.

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31
Q
  1. (DSC-21-10) The pack flow control valve closes automatically in case of;
    (a) Pack overheat, engine starting, or operation of the fire or ditching push button.
    (b) Bleed valve failure, pack outlet pressure increase. (c) Both (a) and (b). (d) Trim air valve failure.
A

(a) Pack overheat, engine starting, or operation of the fire or ditching push button.

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32
Q
  1. (DSC-21-10) In case of trim air system fault (zone controller primary channel failure),the secondary channel of the zone controller regulates the zone temperature at;
    (a) 14 deg.c. (b) 24 deg.c. (c) 15 deg.c. (d) 10 deg.c.
A

(b) 24 deg.c.

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33
Q
  1. (DSC-21-10) In case of total zone controller failure ;
    (a) Hot air and trim air valves open and packs deliver air at a fixed temperature; 15 deg.c. pack 1 , 10 deg.c.pack 2.
    (b) Hot air and trim air valves close and packs deliver air at a fixed temperature; 15 deg.c. pack 1, 10 deg.c.pack 2.
    (c) Hot air and trim air valves close and packs deliver air at a fixed temperature; 20 deg.c. pack 1 , 10 deg.c. pack 2.
    (d) Hot air and trim air valves open and packs deliver air at a fixed temperature; 20 deg.c. pack 1 , 10 deg.c. pack 2.
A

(c) Hot air and trim air valves close and packs deliver air at a fixed temperature; 20 deg.c. pack 1 , 10 deg.c. pack 2.

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34
Q
  1. (DSC-21-10) During landing run ram air inlet flaps open when speed is less than;
    (a) 77 kts. (after 30 sec. delay).
    (b) 70 kts. (after 3 mins ). (c) 70 kts. (after 20 sec. delay).
    (d) 140 kts. (after 20 sec. delay).
A

(c) 70 kts. (after 20 sec. delay).

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35
Q
  1. (DSC-21-10) When the APU is supplying the packs, the pack controller sends a demand signal to increase airflow when a zone temperature cannot be satisfied;
    (a) To the pack ram air inlet flap. (b) To the APU ECB. (c) To the pack flow control valve. (d) To the engine interface units EIUs.
A

(b) To the APU ECB.

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36
Q
  1. (DSC-21-20) The ditching switch when selected;
    (a) The outflow valve closes when in MAN mode. (b) Ram air inlet and ventilation extract valves open. (c) The emergency ram air inlet opens. (d) Outflow valve, ram air inlet & ventilation extract valves, & the pack flow control valves close.
A

(d) Outflow valve, ram air inlet & ventilation extract valves, & the pack flow control valves close.

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37
Q
  1. (DSC-21-20) In flight with pressure controller 1 in use, if it fails;
    (a) You have to use the manual control. (b) Transfers automatically to controller 2.
    (c) You have to select manually controller 2.
    (d) You have to set the landing elevation.
A

(b) Transfers automatically to controller 2.

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38
Q
  1. (DSC-21-20) In normal operation, pressurisation is;
    (a) Fully automatic. (b) Manually controlled. (c) Automatic, but landing elevation must be manually set.
    (d) Remaining automatic only when CPC 1 is in use.
A

(a) Fully automatic.

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39
Q
  1. (DSC-21-20) The outflow valve is powered by;
    (a) One of two electric motors. (b) One of three electric motors. (c) Three mechanically linked electric motors.
    (d) One of three pneumatic actuators.
A

(b) One of three electric motors.

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40
Q
  1. (DSC-21-20) During ground function operation, the outflow valve is;
    (a) Fully open. (b) Fully closed. (c) Positioned according to FMGS demands.
    (d) Operating in abort mode.
A

(a) Fully open.

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41
Q
  1. (DSC-21-20) To see the position of the outflow valve, it is necessary to call ECAM;
    (a) Cond. page. (b) Bleed page. (c) Press. page.
    (d) Vent page.
A

(c) Press. page.

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42
Q
  1. (DSC-21-20) Two identical, independent, automatic digital pressurisation controllers are used for system control;
    (a) One controller active, one in standby. (b) Both controllers monitored by FMGC. (c) No controller for climb phase and No. 2 controller in cruise and descent.
    (d) No. 1 controller for climb and No. 2 for descent.
A

(a) One controller active, one in standby.

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43
Q
  1. (DSC-21-20) Which controller position generates excess cabin altitude and pressure signals for ECAM indication in manual mode;
    (a) Both. (b) No. 1. (c) No. 2.
    (d) Neither.
A

(b) No. 1.

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44
Q
  1. (DSC-21-20) When ram air Pb set to ON, (& ditching not selected), the outflow valve will open when;
    (a) Diff. press. >1.5 psi. (b) Diff. press. < 3 psi. (c) Diff. press. < 1 psi.
    (d) Diff. press. > 1 psi.
A

(c) Diff. press. < 1 psi.

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45
Q
  1. (DSC-21-20) The purpose of the safety valves is to avoid;
    (a) Opening cabin doors whilst still pressuirsed. (b) Rain entering avionics bay. (c) Excessive positive pressure differential, and excessive negative differential.
    (d) Landing with the aircraft pressurised.
A

(c) Excessive positive pressure differential, and excessive negative differential.

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46
Q
  1. (DSC-21-20) The safety valves are operated;
    (a) Electrically.
    (b) Hydraulically.
    (c) Pneumatically.
    (d) By the FMGC.
A

(c) Pneumatically.

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47
Q
  1. (DSC-21-20) When landing elevation is set to auto, the landing elevation is sent to the controller from;
    (a) FMGS. (b) FCU. (c) ADIRS. (d) F/O baro ref.
A

(a) FMGS.

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48
Q
  1. (DSC-21-20) When mode sel. is set to manual, the outflow valve is controlled by signals sent via controller 1 or 2 ;
    (a) True. (b) False. (c) Controllers 1 and 2.
    (d) Only controller 2.
A

(b) False.

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49
Q
  1. (DSC-21-20) On ECAM Cab press. page, the outflow valve indicator changes to amber if;
    (a) It is fully closed. (b) It is fully open in flight. (c) It is fully open on the ground. (d) It is not fully open on the ground.
A

(b) It is fully open in flight.

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50
Q
  1. (DSC-21-20) On ECAM Cab. press. page, the safety valve indication changes to amber if;
    (a) Both safety valves are fully open. (b) One safety valve is open. (c) Both safety valves are fully closed.
    (d) Both safety valves do not open.
A

(b) One safety valve is open.

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51
Q
  1. (DSC-21-20) On ECAM cab. press. page, the cabin altitude indication changes to red when cabin altitude is;
    (a) > 14,000 ft. (b) > 8,500 ft. (c) > 9,550 ft.
    (d) > 8,800 ft.
A

(c) > 9,550 ft.

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52
Q
  1. (DSC-21-20) Following a system 1 fault;
    (a) Master caution is activated and the crew must take ECAM actions.

(b) System 2 must be selected by the crew.
(c) System 2 takes over automatically without any crew action.
(d) The crew must manually operate the system.

A

(c) System 2 takes over automatically without any crew action.

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53
Q
  1. (DSC-21-20) Cabin pressurisation starts at;
    (a) Engine start. (b) Take off power selection. (prepressurisation)
    (c) Lift off. (d) Selection of climb power
A

(b) Take off power selection. (prepressurisation)

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54
Q
  1. (DSC-21-20) The pressure safety valve opens at;
    (a) 8.06 psi.
    (b) 8.6 psi.
    (c) 9.0 psi.
    (d) 7.6 psi.
A

(b) 8.6 psi.

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55
Q
  1. (DSC-21-20) In fully automatic mode, cabin pressurisation is optimised by using information from;
    (a) FMGC, landing field elevation & destination QNH, ADIRS static press. baro. correction and EIU thrust lever angle info.

(b) Actual cruise level and selected landing elevation.

(c) Selected cabin altitude.
(d) Selected landing elevation.

A

(a) FMGC, landing field elevation & destination QNH, ADIRS static press. baro. correction and EIU thrust lever angle info.

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56
Q

How many ACSC’s does the aircraft have?

A

2

Aircraft technical Dec 12

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57
Q

What is the function of the ACSCs?

A

To regulate the outlet temperature of their associated pack.

Aircraft technical Dec 12

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58
Q

What are the three zones for the air conditioning that can be independently controlled?

A

Cockpit
Forward cabin
Aft cabin

Aircraft technical Dec 12

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59
Q

How do the ACSCs control the cabin temperatures in the three zones?

A

By controlling the hot air regulating valve and trim air valves.

Aircraft technical Dec 12

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60
Q

How many lanes does each ACSC have?

A

2

Aircraft technical Dec 12

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61
Q

Which zone(s) and pack does ACSC1 control?

A

Pack 1 and the cockpit zone.

Aircraft technical Dec 12

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62
Q

Which pack and zone(s) does ACSC2 control?

A

Pack 2 and the cabin zones.

Aircraft technical Dec 12

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63
Q

How is the pack control valve operated and controlled?

A

Pneumatically operated
Electrically controlled

Aircraft technical Dec 12

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64
Q

What is the function of the Pack Flow Control Valve?

A

It regulates the airflow in accordance with signals received from the ACSC.

Aircraft technical Dec 12

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65
Q

What is keeping the Pack Flow Control Valve closed in the absence of air pressure?

A

A spring.

Aircraft technical Dec 12

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66
Q

When does the pack flow control valve automatically close?

A
  • operation of fire or ditching PBs
  • Pack overheating
  • Engine starting

Aircraft technical Dec 12

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67
Q

How is the pack inlet scoop controlled?

A

By the ACSC

Aircraft technical Dec 12

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68
Q

What does the pack inlet scoop do during take off and landing and why?

A

Closes to avoid ingestion of foreign matter.

Aircraft technical Dec 12

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69
Q

What is the bypass valve in the air conditioning system used for?

A

To adjust pack outlet temperature.

Aircraft technical Dec 12

70
Q

How is cabin air being recirculated?

A

By recirculating fans.

Aircraft technical Dec 12

71
Q

What is the function of the mixer unit?

A

It mixes cold fresh air from the packs with recirculated cabin air.

Aircraft technical Dec 12

72
Q

What is the function of the Ram Air Inlet?

A

Ventilates the cockpit and cabin to remove smoke or when both packs fail.

Aircraft technical Dec 12

73
Q

What happens to the outflow valve when the ram air PB is turned on?

A

Opens about 50%, provided it is under automatic control and P is less than 1PSI.

Aircraft technical Dec 12

74
Q

How are the trim valves controlled?

A

Electrically by the ACSC.

Aircraft technical Dec 12

75
Q

What are the four general functions of the cabin pressurization system?

A
  • Ground function
  • Pre-pressurization
  • Pressurization in flight
  • De-pressurization

Aircraft technical Dec 12

76
Q

Which areas of the aircraft are pressurized?

A

Cockpit
Cabin
Avionics bay
Cargo compartments

Aircraft technical Dec 12

77
Q

What controls the cabin pressure?

A

2 independent digital Cabin Preddure Controllers

Aircraft technical Dec 12

78
Q

Where do the CPCs receive signals from?

A

ADIRS
FMGC
EIU
LGCIU

Aircraft technical Dec 12

79
Q

How many motors does the outflow valve have?

A

Three.

Aircraft technical Dec 12

80
Q

How many automatic motors for the outflow valve? And how controlled?

A

2 automatic motors
Controlled by associated CPC.

Aircraft technical Dec 12

81
Q

How many manual motors for the outflow valve and how controlled?

A

1 manual motor, driven by the backup section of CPC1.

Aircraft technical Dec 12

82
Q

What is the function of the pneumatic safety valves?

A

Prevent the cabin pressure from going too high (8.6PSI) or too low (1psi).

Aircraft technical Dec 12

83
Q

Where are the safety valves located?

A

On the rear pressure bulkhead.

Aircraft technical Dec 12

84
Q

When does an automatic transfer take place between CPCs?

A
  • 70seconds after each landing
  • if the operating system fails

Aircraft technical Dec 12

85
Q

In fully automatic control, what information does the CPC use?

A

Landing elev and QNH from FMGC

Pressure altitude from ADIRS

Aircraft technical Dec 12

86
Q

When does semi automatic control engage for the CPCs?

A

When no information is available from the FMGC (QNH and landing elev)

Aircraft technical Dec 12p

87
Q

What information doe the CPC use in semi automatic mode?

A

The CAPT baro reference from ADIRS and LDG ELEV manual selection.

Aircraft technical Dec 12

88
Q

What closes when pushing the ditching PB?

A

Outflow valve
Ram air inlet
Avionics ventilation in and extract valves
Pack flow control valves.

Aircraft technical Dec 12

89
Q

What is the function of the avionics ventilation system?

A

Cools electrical and electronic components in the avionics compartment and on the flight deck including instrument and circuit breaker panels.

Aircraft technical Dec 12

90
Q

What controls all valves and fans in the avionics ventilation system?

A

The AEVC

Aircraft technical Dec 12

91
Q

When is the avionics ventilation in the open loop?

A

On the ground only when skin temperature is above the on ground threshold.

Aircraft technical Dec 12

92
Q

What is the skin temperature on ground threshold?

A

+12 (temp increasing)
+9 (temp decreasing)

Aircraft technical Dec 12

93
Q

When do the skin inlet and extract valves close?

A

When skin temp is below on ground threshold.
When take off thrust is set

Aircraft technical Dec 12

94
Q

How are the batteries ventilated?

A

By Venturi.

Aircraft technical Dec 12

95
Q

How are the lavatories and galleys ventilated?

A

Extraction fan

Aircraft technical Dec 12

96
Q

If only one pack is selected on or the APU is supplying bleed air, what airflow will be delivered, regardless of setting?

A

HI FLOW.

97
Q

When do you get an ECAM warning of excessive cabin pressure?

A

>9550ft

98
Q

What does a PACK FAULT ECAM message indicate?

A

The valve position disagrees with the selected position or the Valve is closed.

99
Q

When does a pack overheat occur?

A

Outlet temp >260C or >230C four times in one flight.

100
Q

When does a duct overheat occur?

A

88C or 80C four times in flight.

101
Q

What is the function of the mixing unit?

A

Mixes air that comes from the cabin and the packs.

102
Q

What is the function of the ram air inlet?

A

Can provide ambient air to the mixing unit in emergency.

103
Q

How is air supplied by the pneumatic system? (Which components)

A

2 pack flow control valves
2 packs
Mixing unit
Ram air inlet

104
Q

How is the temperature of air entering the cabin controlled?

A

Two Air Conditioning System Controllers (ACSC)

105
Q

Where do the trim air valves take the air from?

A

Tapped upstream of the packs.

106
Q

What is the function of the trim air valves?

A

Add hot air to the mixing unit.

107
Q

What is the function of a pack & how does it achieve this?

A

Function - to cool hot pneumatic bleed air.

Achieved by; Energy is removed by an Air Cycle Machine and also by Heat Exchangers which are themselves cooled by Ram Air.

108
Q

What does the Pack Bypass valve do and what controls it?

A

It determines how much air passes through the Pack Air Cycle Machine and Main Heat Exchanger & how much bypasses them.
This determines Pack output temperature.

The Bypass Valve is controlled by the two channel Pack Controller.

DSC-21-10-30

109
Q

What does the Pack Flow Control Valve do?

How is it operated?

Which component controls it?

A
  • it varies the rate of Air-flow to the pack
  • Electrically signalled closed (engine start, Fire p/b, o/heat,) Pneumatically opened by Upstream Pneumatic Pressure.
  • it is controlled by the onside Pack Controller

DSC-21-10-20
DSC-21-10-30

110
Q

What components are controlled by the Pack Controllers?

A
  • Pack Flow Control Valve
  • Pack heat exchanger ram air inlets.
111
Q

To where does the Emergency Ram Air inlet connect and what condition must be satisfied before it will open?

A
  • mixer unit
  • Delta P < 1 psi
112
Q

How is the Hot Air Pressure Regulating Valve Operated?

A

Electrically signalled, Pneumatically opened by Upstream Air Pressure.

113
Q

How are the Trim Air Valves operated; what controls them?

A
  • Electrically signalled & operated.
  • All 3 TAVs are controlled by the single Zone Controller.
114
Q

When do Pack Ram Air Inlet Flaps Open & Close?

A
  • CLOSE for Take-off when TOGA/FLEX thrust set
  • OPEN at Lift Off
  • CLOSE on Landing on touchdown
  • OPEN at 70 knots +20 seconds.

DSC 21-10-30

115
Q

With Pack Flow Rate selected to NORM;

Give two occasions when Pack Flow rate will be HIGH.

A
  • Single Pack Operations
  • APU supplying Bleed Air

DSC 21-10-30

116
Q

In Normal Operations, what temperature demand is signalled by the Zone Controller to the Pack Controllers?

A

That the packs both output air at the lowest demanded zone temperatures.

DSC-21-10-30

117
Q

What happens to zones requiring warmer air than the lowest demanded zone temperature?

A

Trim Air Valves will open to add Hot Air to the Air supplied to that zone.

118
Q

What is the temperature range of the Flight Deck temperature controls?

A

18 deg C to 30 deg C.

119
Q

The Zone Controller has two channels: Primary & Secondary.

What happens if the Primary Channel Fails?

What is this mode of Temperature Regulation called & how is it shown?

A
  • The Secondary channel is unable to read the Flight Deck Temp Selectors or control the TAVs, although it can sense zone ambient temperatures. It assumes that all zones should be at 24 deg C, so commands the Pack Controllers to Output Air at appropriate temperatures to achieve this.
  • This is called ALTN MODE
  • Indicated by caption ALTN MODE on the COND SD.

NB: When in ALTN mode control, the two packs may be running at different temperatures.

REF: cannot find an official one (Alteon Question Pack.)

120
Q

What happens if the Zone Controller Secondary Channel (only) fails?

A

Redundancy is lost, but System Temperature Control is not otherwise affected.

121
Q

What happens if both Zone Controller Channels fail?

What is this mode of Temperature Regulation called & how is it shown?

A
  • The Zone Controller is unable to send control signals to the Pack Controllers. In the absence of such incoming signals, the Left Pack outputs air at a fixed 20 deg C and the Right at 10 deg C. There are no ECAM AirCond parameters.
  • This is called PACK REG
  • Annotated as PACK REG on the COND SD.
122
Q

Each Pack Controller has two channels: Primary and Secondary.

What is the effect of failure of the Primary?

A

The secondary channel continues to control the pack to the Temp signalled by the Zone Controller.

However, Pack Valve Flow Rate will be fixed at the current setting.

123
Q

What is the effect of Failure of the Secondary Pack Controller Channel?

A

Pack Parameters are lost from the BLEED SD. That is all.

124
Q

What is the effect of Failure of the Primary and Secondary Pack Controller Channels?

A

In the absence of any incoming control signals from its Controller, the Pack itself will run at a ‘suitable temperature’ (believed to be between 5 deg C & 30 deg C) in a process that involves pneumo-mechanical control of the Pack Anti-ice Valve.

Pack Flow Rate is Fixed.

No Pack Function parameters on ECAM.

125
Q

What is the effect of Failure of the Hot Air PRV?

A
  • The Trim Air Valves will all close.
  • The Zone Controller will signal the Packs to run at appropriate (and, if necessary, different) temperatures to maintain the Selected Temperature in the Flight-deck and the average of the two selected temps in the cabin.
126
Q

What does a FAULT light in the Hot Air p/b mean and what happens if it illuminates?

A
  • Duct Overheat downstream of the Trim Air Valves.
  • If such a condition is detected, the Hot Air PRV and all 3 Trim Air Valves close.
127
Q

If the Pack Valve has insufficient upstream pressure, it will not open.

However, in what circumstances will it be Electrically signalled closed?

A
  • COMPRESSOR Outlet Overheat
  • During Engine Start
  • Fire p/b pressed
  • Ditching p/b pressed.
128
Q

What does a FAULT light in a Pack Valve p/b indicate?

A
  • PACK Outlet Temperature Overheat
  • COMPRESSOR Outlet Temperature Overheat
  • valve out of selected position

Note: If Compressor Outlet Overheat is detected, the valve closes;
The procedure requires it to be switched off & left switched off.
However, if there is a Pack Outlet Overheat, the valve is not commanded closed.
This action is taken by Pilots, who may re-instate the pack when it has cooled.

129
Q

What 4 Pack Parameters are shown on the BLEED SD?

A
  • Flow Rate
  • Internal Temp (Compressor Outlet : This is the hottest part of the Pack)
  • Bypass valve position
  • Pack Outlet Temp
130
Q

How is Re-circulating Fan Failure displayed on ECAM?

A

An amber FAN caption on the COND SD

131
Q

What parameters are shown on the COND page?

A
  • HOT AIR PRV Position
  • Trim Air Valve Positions
  • Air Supply Duct Temp
  • Cabin Temps
  • ALTN MODE or PACK REG caption
  • FAN fail captions
132
Q

Where else are Cabin Temps displayed?

A

The CRUISE SD

133
Q

The Emergency Ram Air Valve (or, more precisely, a check valve just downstream of it) should not open if Delta P > 1psi.

May we rely on this mechanical protection and press the Ram Air p/b at any time?

A

No.

Open Ram Air to provide Ventilation only if Delta P < 1 PSI.

134
Q

Each of the 2 AC Controller is divided up into…

A

2 Lanes

135
Q

What happens to the PACKs during TO and Landing?

A

The inlets and outlet close to prevent FOD

136
Q

How is PACK air temp regulated

A

Throttling the Bypass Valve warms the air with hot air bypassed from the primary HE

137
Q

What does the valve icon on the BLEED status page represent?

A

The bottom valve is the Pack Flow Control Valve position.

The upper valve is the Bypass Valve position

138
Q

What regulates the different zone temperatures?

A

The addition of bleed air warms compartments that are required to be warmer than the coldest set compartment.

139
Q

What is the purpose of the recir fans?

A

By recirculating the air, bleed air demand is reduced leading to fuel savings

140
Q

Why would the mixing unit line at the top of the BLEED page be amber?

A

Pack flow control valves and ram air inlet are closed

141
Q

Why would you receive a FAULT Pack fault light?

A

Pack flow control valve disagrees with commanded position

Pack compressor overheat

Pack outlet temperature overheat

(note: valve closes auto during an overheat condition)

142
Q

What are the extreme and middle temperature settings on the control knob

A

COLD = 64F
12 o’clock=76F
HOT=86F

143
Q

Does the FAULT on the HOT AIR pb indicate?

A

Duct overheat

144
Q

What if you see PACK faults during pre-flight?

A

This is normal, indicating that there is not enough bleed air pressure for the packs until the APU or Engine Bleed is opened.

145
Q

Your aircraft has less than 115 people, what Pack Flow setting should you set?

A

LO, to conserve fuel

146
Q

You select the RAM AIR to open but it does not react as commanded, why?

A

The valve will only open is Delta Press is less than 1.0 psi. Basically, you need to descend.

147
Q

When should you select ECON FLOW ON on the A321?

A

When passenger count is < 140. IT reduces pack flow up to 20%

148
Q
A
149
Q

What are the max pressure differentials for the two safety valves?

A

+8.6psi and -1.0psi

150
Q

How is pressurization controlled?

A

Two Pressurization Controllers and a backup manual controller

151
Q

What does the Residual Pressure Control Unit do? (A320 only)

A

Automatically depressurizes in case of abnormal residual pressure on the ground.

Activates if (all conditions):
The outflow valve does not fully open
Both CPCs fail or manual mode
AC on the ground
Engines are shutdown or <100knots

152
Q

What are the inputs to the Pressure Controllers?

A

FMS, LGCIUs, ADIRs and throttle position

153
Q

When would you have to set the landing elevation?

A

Destination airport is not in the FMS database

OR

Both FMGCs fail

154
Q

What does the DITCHING pb close?

A

Outflow valve (if not set to MAN)
Emergency Ram Air Inlet
Avionics ventilation inlet and extract valves
Pack flow control valves
Forward cargo isolation valves

155
Q

What happens during takeoff?

A

When TOGO power is set, the controller starts cabin pressure climb at 400fpm until delta P is 0.1psi. Aborted takeoffs revert to ground mode.

156
Q

When will the pressurization system enter Abort mode?

A

Below 8000’
less than normal climb or
descent >200fpm for 30 seconds

Pressure reset to +0.1psi until climb re-initiated

157
Q

What is the max delta presurization?

A

8psi

158
Q

What is normal rate of cabin decent?

A

-750fpm, after touchdown it continues at -500fpm

159
Q

When does the pressurization controller switch to the other controller?

A

After each landing

160
Q

When in MAN mode, what is the target cabin VSI?

A

500fpm

161
Q

What is the OPEN configuration?

A

In warm ambient climates (>50F), the blower motor takes outside air, blows it over the avionics and discharged by the extract fan and valve..

Both blower and extraction valves are OPEN

162
Q

What is the CLOSED configuration?

A

In cold ambient climates (<50F), the blower and extract fans operate when the valves are closed, circulating air from inside the fuse only.

Both blower and extraction valves are CLOSED.

Condition after TOGO power, in-flight to landing

163
Q

What is the intermediate configuration?

A

In very hot climates (>90F), the extract valve is partially open during TO until colder ambient conditions are reached.

164
Q

What controls the Avionics ventilation system?

A

Avionics Equipment Ventilation Computer (AEVC)

165
Q

What is unique about out cargo compartments?

A

Cargo heat is disabled, we do not carry pets!!

166
Q

Why would the inlet and extract valves be amber?

A

The valve position does not agree with the commanded position.
OR
The valves are in transit
OR
Skin temp between 8-12C

167
Q

When would a BLOWER fault illuminate?

A

Blower fan low pressure

Duct overheat

Computer power supply failure

Avionics smoke

168
Q

When would a EXTRACT fault illuminate?

A

Extract fan low pressure

Computer power supply fails

Avionics smoke

169
Q

What happens when you press OVRD on the BLOWER or EXTRACT pb?

A

The blower or extract fan stops and air conditioned air is introduced.

Note: In normal conditions, the bay is cooled by the skin heat exchanger to save fuel.

170
Q

What is the serious in-flight failure in regards to avionics cooling system?

A

Extract valve opens in flight which can compromise pressurization.
Note: In inlet duct has a non-return valve to present this if the inlet valve opens.

171
Q

What indicates smoke int he avionics bay?

A

MASTER CAUT

SMOKE light on GEN ! LINE

FAULT on both BLOWER and EXTRACT

AVNCS SMOKE message

4. Systems (19 decks)

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