Avionics Equipment Ventilation - General Arrangement
Figure 001
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Avionics Equipment Ventilation - General Arrangement
Figure 001A
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1
Avionics Equipment Ventilation - Component Location
Figure 002
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Avionics Equipment Ventilation - Component Location
Figure 002A
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Avionics Equipment Ventilation - Component Location
Figure 002B
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Avionics Equipment Ventilation - Component Location
Figure 002C
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Avionics Equipment Ventilation - Component Location Figure 003
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R B. Cathode Ray Tubes (CRTs)
R The CRTs located on the pilot's panel are cooled with air blown through a
R sealed inlet/outlet on the panel.
R C. Pedestal Instruments
R The pedestal instruments are cooled with air blown through the
R instruments on the upper panel and around the instruments on the lower
R panel. The air then goes into the avionics compartment through vents in
R the cockpit floor.
R D. Cockpit Panels
R The overhead circuit breaker and system control panels are cooled with
R cockpit air. This air is drawn around the back of the panels and into the
R avionics ventilation system.
R E. Tranformer Rectifiers (TR)
R The transformer rectifiers are cooled with avionics compartment air. This
R air is drawn through the equipment into the avionics ventilation system.
R F. Window Heat Controllers (WHC)
R The WHCs are cooled with air blown through the equipment into the
R avionics compartment.
R G. Radar
R The radar is cooled by air blown into the equipment through a sealed
R inlet and blown out through an unsealed outlet (Ref. ARINC 600).
R H. Batteries (Independent Circuit)
R The batteries are cooled with avionics compartment air drawn through an
R inlet, around the batteries and overboard through a venturi. The
R ventilation is only effective with cabin differential pressure.
4. Power Supply____________
R Described in the figures mentioned below.
5. Interfaces__________
R (Ref. Fig. 004, 005)
R
6. Component Description_____________________
Avionics Equipment Ventilation Schematic (Sheet 1/2)
Figure 004
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R Avionics Equipment Ventilation Schematic (Sheet 2/2) Figure 005
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A. Avionics Equipment Ventilation Computer (AEVC) (Ref. Fig. 006) The AEVC 10HQ is a 2MCU (Ref. ARINC 600) electronic assembly mounted on a chassis encased in a metal cover. The AEVC is located on shelf 88VU in the aft electronics rack 80VU. The AEVC controls the valves and fans in the avionics ventilation system. Pressure switches and temperatures sensors in the system send in formation related to the system status to the AEVC. The cabin pressure controller and the Landing Gear Control and Interface Unit (LGCIU) send additional information to the AEVC. The AEVC does a power-up test when electrical power is supplied and continuously monitors the system components.
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