Environmental Control System Flashcards

1
Q

What are the three systems that make up the ECS?

A

FACS - Forward Avionics Cooling system
HVS, Heating and Ventilation System
RBCS - Rear Bay Cooling System.

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2
Q

What is the purpose of the heating control unit in the HVS system?

A

It is the central processing unit and maintains the desired air temperature between ambient and 65 degees C

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3
Q

Where is the temperature control valve?

A

Rear Bay

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4
Q

What is the purpose of the temperature control valve?

A

Controls the flow of P3 air.

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5
Q

Where is the Pressure Regulating and Shut Off Valve? (PRSOV)

A

Left engine bay.

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6
Q

What is the purpose of the PRSOV?

A

1) Removes pressure variations and surges associated with engine performance.
2) Acts as an On/Off Valve.

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7
Q

If the HVS fan were to overheat and latch off, once it had cooled how would you turn the HVS back on?

A

Power must be re-cycled to re-initiate the system.

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8
Q

Where is the overheat Temperature sensor for the HVS?

A

Immediately downstream of the mixing unit.

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9
Q

What is the purpose of the overheat temperature sensor?

A

Detects over heat (90 degrees C) and provides [HVS DUCT HOT] caution.

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10
Q

What is the purpose of the ambient temperature sensor in the HVS system? (furthest sensor downsteam)

A

It monitors the duct temperature with respect to the selected setting and provides a feedback signal to the heating control system.

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11
Q

Which is the primary fan in the FACS system?

A

AC Fan

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12
Q

What is the fan inlet duct designed to do?

A

Slow the airflow so that water a particles can drop out of the airflow.

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13
Q

If the FACS system had a failure detected by an underspeed sensor what caption would be displayed?

A

[FACS PRI FAN] or [FACS SEC FAN]

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14
Q

What are the available positions on the primary and secondary fan switches? (FACS)

A

Primary - Auto and Off

Secondary - Auto, Manual and Off

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15
Q

What are the available positions on the RBCS fan switch?

A

OFF, 1 and 2

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16
Q

Where is the air inlet for the FACS?

A

Right hand nose bay.

17
Q

Why are there 2 fans for the RBCS?

A

Redundancy.

18
Q

Where is the Heating control unit located?

A

Forward bulkhead of the rear bay.

19
Q

What stops the HVS from over pressurising if everyone closes their vents?

A

2 vents underneath the Pilots an co-pilots seats are permanently open.

20
Q

Where are the switches for the FACS?

A

TBC

21
Q

The primary and secondary fans are in auto, the primary fails, what happens?

A

The secondary fan comes on.