A320 Avionic cooling logic
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A320 Avionic cooling logic
Hi all
Regarding Avionic cooling on A320 fleet
The FCOMS says
CLOSED CONFIGURATION (Flight and ground)
Flight phase
The threshold is
+35c and increasing
+32c and decreasing
Ground phase
The threshold is
+12c and increasing
+9c and decreasing
INTERMEDIATE CONFIGURATION (Inflight only)
The threshold is
+35c and increasing
+32c and decreasing
OPEN CONFIGURATION (On ground only)
The threshold is
+12c and increasing
+9c and decreasing
I do understand that the 3 degrees split is for the computer not to go crazy.
I am trying to visualize the above logic, any idea to simplify this ?
Highly appreciate your knowledge sharing.
Regarding Avionic cooling on A320 fleet
The FCOMS says
CLOSED CONFIGURATION (Flight and ground)
Flight phase
The threshold is
+35c and increasing
+32c and decreasing
Ground phase
The threshold is
+12c and increasing
+9c and decreasing
INTERMEDIATE CONFIGURATION (Inflight only)
The threshold is
+35c and increasing
+32c and decreasing
OPEN CONFIGURATION (On ground only)
The threshold is
+12c and increasing
+9c and decreasing
I do understand that the 3 degrees split is for the computer not to go crazy.
I am trying to visualize the above logic, any idea to simplify this ?
Highly appreciate your knowledge sharing.
Last edited by b767300; 24th Jun 2014 at 07:17.
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Open:
-This configuration is used if warm ambient conditions exist while the aircraft is on the ground.
-Outside air is drawn through the open inlet valve by the blower fan where it then passes around the avionics equipment.
-The extract fan then pulls the heated air and expels it out through the fully open extract valve.
-Avionics compartment air does not pass through the aircraft skin heat exchanger or the cargo under floor.
Intermediate:
-This configuration is used if warm ambient conditions exist during flight (airborne or thrust levers placed to a takeoff position while on the ground).
-The configuration is exactly the same as the closed configuration except that a small internal flap within the extract valve opens to expel some of the heated avionics compartment air overboard.
Closed:
-This configuration is used mostly during flight or if cold ambient conditions exist while the aircraft is on the ground.
-Avionics compartment air is cooled via an aircraft skin heat exchanger; air is circulated by the blower and extract fans.
-The inlet and extract valves remain closed.
-Air is expelled through the cargo under floor and out through the outflow valve.
A G00g1e search for "Quizlet A320 Air Systems mrdeerwood" found a text description, does my picture (incorporating a table of the thre possible heat sinks assist?
-This configuration is used if warm ambient conditions exist while the aircraft is on the ground.
-Outside air is drawn through the open inlet valve by the blower fan where it then passes around the avionics equipment.
-The extract fan then pulls the heated air and expels it out through the fully open extract valve.
-Avionics compartment air does not pass through the aircraft skin heat exchanger or the cargo under floor.
Intermediate:
-This configuration is used if warm ambient conditions exist during flight (airborne or thrust levers placed to a takeoff position while on the ground).
-The configuration is exactly the same as the closed configuration except that a small internal flap within the extract valve opens to expel some of the heated avionics compartment air overboard.
Closed:
-This configuration is used mostly during flight or if cold ambient conditions exist while the aircraft is on the ground.
-Avionics compartment air is cooled via an aircraft skin heat exchanger; air is circulated by the blower and extract fans.
-The inlet and extract valves remain closed.
-Air is expelled through the cargo under floor and out through the outflow valve.
A G00g1e search for "Quizlet A320 Air Systems mrdeerwood" found a text description, does my picture (incorporating a table of the thre possible heat sinks assist?
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Note that on the latest A320 the logic has changed slightly. Our last 3 aircraft delivered this year have a different setting for on the ground.
Before, on the ground, skin temp above 12deg and the inlet/outlet doors would open. On the new config they stay closed until the avionics cooling exhaust rises to 35 deg. So in European temps, the inlet/outlet flaps will not open normally on the ground.
The crew notice and ask questions.
Before, on the ground, skin temp above 12deg and the inlet/outlet doors would open. On the new config they stay closed until the avionics cooling exhaust rises to 35 deg. So in European temps, the inlet/outlet flaps will not open normally on the ground.
The crew notice and ask questions.
