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ATPL 21 AIRCRAFT GENERAL KNOWLEDGE – AIRFRAME AND SYSTEMS |
| 21.08 ELECTRICS |
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1
Assume that during cruise flight with airconditioning packs on, the outflow valve(s) would close. the result would be that:
The pressure differential would go to the maximum value |
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2
In a manually operated system, the cabin altitude rate of change is normally controlled by :
A rate of change selector. |
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3
Assuming cabin pressure decreases, the cabin rate of climb indicator should indicate :
A rate of climb. |
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4
Assuming cabin differential pressure has attained the required value in normal flight conditions, if flight altitude is maintained :
A constant mass air flow is permitted through the cabin. |
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5
Under normal flight conditions, cabin pressure is controlled by :
Regulating the discharge of air through the outflow valve(s). |
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6
The term "pressure cabin" applies when an aeroplane :
Has the means to maintain cabin pressure higher than ambient pressure. |
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7
A cabin pressure controller maintains a pre-set cabin altitude by regulating the :
Position of the outflow valve(s). |
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8
A warning device alerts the crew in case of an excessive cabin altitude. this warning must be triggered on reaching the following altitude:
10000 ft (approx. 3000 |
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9
With regard to the pneumatic mechanical devices which afford protection against the formation of ice, the only correct statement is:
The pneumatic mechanical device can only be used as a de- icing device. |
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10
On most modern airliners the cabin pressure is controlled by regulating the:
Airflow leaving the |
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11
The purpose of cabin air flow control valves in a pressurization system is to : pressure surges.
Maintain a constant and sufficient mass air flow to ventilate the cabin |
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12
Assuming cabin differential pressure has attained the required value in normal flight conditions, if flight altitude is maintained:
A constant mass air flow is permitted through the cabin. |
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13
Cabin pressure is controlled by :
Delivering a substantially constant flow of air into the cabin and controlling the outflow. |
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14
During level flight at a constant cabin pressure altitude (which could be decreased, even at this flight level), the cabin outflow valves are:
Partially open. |
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15
The purpose of a ditching control is to:
Close the outflow valve(s). |
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16
The cabin pressure is regulated by the:
Outflow valve. |
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17
The pressurization of the cabin is controlled by :
The cabin outflow valve. |
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18
Cabin differential pressure means the pressure difference between:
Cabin pressure and ambient air pressure. |
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19
Under normal conditions (jar 25) the cabin pressure altitude is not allowed to exceed:
8000 ft |
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20
On a modern large pressurized transport aircraft, the maximum cabin differential pressure is approximately:
7 - 9 psi |
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21
During a normal pressurised climb after take-off:
Cabin pressure decreases more slowly than atmospheric pressure |
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22
If the maximum operating altitude of an airplane is limited by the pressurized cabin, this limitation is due to the maximum:
Positive cabin differential pressure at maximum cabin altitude. |
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23
The "cabin differential pressure" is:
Cabin pressure minus ambient pressure. |
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24
The cabin rate of descent is:
A cabin pressure increase. |
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25
The maximum differential pressure of a transonic transport category airplane is approximately:
9.0 psi |
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26
The pneumatic ice protection system is mainly used for:
Wings. |
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27
Cabin altitude means the:
Cabin pressure expressed as altitude. |
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28
(for this question use annex 021-786a) in a pressurized aircraft whose cabin altitude is 8000 ft, a crack in a cabin window makes it necessary to reduce the differential pressure to 5 psi. the flight level to be maintained in order to keep the same cabin altitude is:
Fl 230 |
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29
If the cabin altitude rises (aircraft in level flight), the differential pressure: action is taken.
Decreases |
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30
The purpose of the cabin pressure controller, in the automatic mode, is to perform the following functions: 1. control of cabin altitude, 2. control of cabin altitude rate-of-change, 3. limitation of differential pressure 4. balancing aircraft altitude with cabin altitude 5. cabin ventilation 6. keeping a constant differential pressure throughout all the flight phases. the combination regrouping all the correct statements is :
1, 2, 3 |
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31
Concerning the sequential pneumatic impulses used in certain leading edge de- icing devices, one can affirm that : 1 - they prevent ice formation. 2 - they are triggered from the flight deck after icing has become visible. 3 - a cycle lasts more than ten seconds. 4 - there are more than ten cycles per second. the combination which regroups all the correct statements is :
02-mar |
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32
If the pressure in the cabin tends to become lower than the outside ambient air pressure the :
Negative pressure relief valve will open. |
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33
A pneumatic de-ice system should be operated ..
When there is approximately 1,5 cm of ice on leading edges. |
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34
An aircraft with a pressurized cabin is settled at its cruise level. during the flight, a malfunction of the pressure controller is detected by the crew and the cabin rate of climb indicator reads - 200ft/min. given that : delta p: differential pressure zc: cabin altitude
Delta p will rise up to its maximum value, thus causing the safety relief valves to open. zc. |
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35
An aircraft with a pressurized cabin flies at level 310. following a malfunction of the pressure controller, the outflow valve runs to the open position. given : vzc: cabin rate of climb indication zc: cabin pressure altitude delta p: differential pressure this will result in a:
Vzc increase zc increase delta p decrease |