CASA ATPL SYSTEMS- PNEUMATIC
SYSTEMS EXAM
Why is the pnumatic system not as effective as hydraulic for control movement? -
Correct Answers -Air is compressible
What are pneumatic systems used for? - Correct Answers -Air Con
Pressurisation
Hydraulic resevoir pressure
Air driven hydraulic pumps
wing and engine anti ice
Where is pneumatic air sourced from? - Correct Answers -LP Compressor (2 spool)
Intermediate compressor (3 spool)
How is transfer from low pressure bleed to high pressure bleed air achieved? - Correct
Answers -A high pressure regulating valve at the HP compressor. a control butterfly is
found between the HP and IP stages to prevent reverse flow
How do the electrical anti ice components work? - Correct Answers -Anti-ice or heating
elements located on the windows, pitot tube, static ports etc, which use electrical
current to heat components and remove icing.
How does rain protection of the windscreen operate? - Correct Answers -windscreen
will have either wipers (2 speed) or repellent.
How is icing detected? - Correct Answers -ice detector probes, will vibrate at a set
frequency, if ice accumulates frequency changes and a cockpit light illuminates.
How is air cooled once taken from the compressor? - Correct Answers -Turbo fan air is
ducted over a heat exchanger regulating temperature of HP bleed air.
Which compressor stage is air taken from as thrust increases? - Correct Answers -At
low thrust settings, HP bleed air is used.
As thrust increases the HP valve closes and air is taken from the LP section.
How is air sent to the respective systems? - Correct Answers -Once past the bleed air
valve control air is passed through a pressure duct for distribution.
SYSTEMS EXAM
Why is the pnumatic system not as effective as hydraulic for control movement? -
Correct Answers -Air is compressible
What are pneumatic systems used for? - Correct Answers -Air Con
Pressurisation
Hydraulic resevoir pressure
Air driven hydraulic pumps
wing and engine anti ice
Where is pneumatic air sourced from? - Correct Answers -LP Compressor (2 spool)
Intermediate compressor (3 spool)
How is transfer from low pressure bleed to high pressure bleed air achieved? - Correct
Answers -A high pressure regulating valve at the HP compressor. a control butterfly is
found between the HP and IP stages to prevent reverse flow
How do the electrical anti ice components work? - Correct Answers -Anti-ice or heating
elements located on the windows, pitot tube, static ports etc, which use electrical
current to heat components and remove icing.
How does rain protection of the windscreen operate? - Correct Answers -windscreen
will have either wipers (2 speed) or repellent.
How is icing detected? - Correct Answers -ice detector probes, will vibrate at a set
frequency, if ice accumulates frequency changes and a cockpit light illuminates.
How is air cooled once taken from the compressor? - Correct Answers -Turbo fan air is
ducted over a heat exchanger regulating temperature of HP bleed air.
Which compressor stage is air taken from as thrust increases? - Correct Answers -At
low thrust settings, HP bleed air is used.
As thrust increases the HP valve closes and air is taken from the LP section.
How is air sent to the respective systems? - Correct Answers -Once past the bleed air
valve control air is passed through a pressure duct for distribution.
