R **ON A/C 106-149, 159-199, 211-299, 301-399, 401-499,
 A. Avionics Equipment Ventilation Computer (AEVC) (Ref. Fig. 006A) 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 87VU 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.

 Avionics Equipment Ventilation Computer (AEVC) - Location
 Figure 006

R 1EFF : 001-049, 051-099, 101-105, 151-158, 1 21-26-00Page 18 1201-210, 1May 01/05 1 1 1CES 1

 Avionics Equipment Ventilation Computer (AEVC) - Location
 Figure 006A

R 1EFF : 106-149, 159-199, 211-299, 301-399, 1 21-26-00Page 19 1401-499, 1Aug 01/05 1 1 1CES 1 **ON A/C ALL

 B. Blower Fan (Ref. Fig. 007) The blower fan 20HQ is powered with a three phase, four-pole single induction motor. The motor drives a fan-wheel which has high efficiency blades and operates continuously at about 11,600 rpm. A thermo switch and relay are installed on the stator of the blower fan. If the temperature of the stator gets to + 140 deg. C (+ 284 deg.F), the thermo switch isolates the electrical supply to the fan. A fault indication light and reset button are installed on the fan body. The blower fan is secured with clamps to brackets on the aircraft structure in the avionics compartment. Arrows on the fan casing show the direction of airflow through the fan and direction of the impeller rotation. If the impeller breaks up, the casing is strong enough to contain debris.
 C. Extract Fan
 (Ref. Fig. 007)
 The extract fan 18HQ is identical to the blower fan 20HQ.

 D. Skin Air Inlet Valve
 **ON A/C 001-049, 051-058, 101-101,
 (Ref. Fig. 008)

R **ON A/C 059-099, 102-149, 151-199, 201-299, 301-399, 401-499,
 (Ref. Fig. 008A)
 **ON A/C ALL
 The skin air inlet valve 15HQ is installed in the fuselage skin at the forward-lower left-hand side. This valve is an electrically-operated single-flap valve which can be manually overriden. When the aircraft is on the ground the valve is fully open. In flight, the valve is fully closed. On ground, if, after the take off sequence signal, the valve does not close, the ground crew can manually close it. Before the valve is closed manually, it first must be electrically isolated with a toggle switch located inside the valve.

 Blower/Extract Fans Figure 007
 1EFF : 1 1R 1CES  ALL  1 11 1 21-26-00 Page 21 Aug 01/04

 Skin Air Inlet Valve Figure 008 
R 1EFF : 1 1 1CES  001-049, 051-058, 101-101,  1 111 21-26-00 Page 22 May 01/05

 Skin Air Inlet Valve
 Figure 008A

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 E. Skin Air Outlet Valve
 **ON A/C 001-049, 051-058, 101-101,
 (Ref. Fig. 009)

R **ON A/C 059-099, 102-149, 151-199, 201-299, 301-399, 401-499,
 (Ref. Fig. 009A)
 **ON A/C ALL
 The skin air outlet valve 22HQ is installed in the fuselage skin at the forward-lower right-hand side. This valve is an electrically-operated single-flap valve incorporating a second smaller flap. When the aircraft is on the ground, the valve is fully open. In flight, the valve is fully closed. The smaller flap opens during flight when the following happens:
 -when the skin temperature is above + 34 deg.C (+ 93.2 deg.F) (partially open circuit),
 -
if smoke is detected in the avionics ventilation system,

 -
if the AEVC 10HQ does not operate correctly. On the ground, if after the take off sequence signal, the valve does not close, the ground crew can manually close it. Before the valve is closed manually, it first must be electrically isolated with a toggle switch inside the valve.

 F. Skin Exchanger Inlet Bypass Valve (Ref. Fig. 010) The skin exchanger inlet bypass valve 16HQ is installed downstream of the extract fan 18HQ in the tapping to the FWD underfloor area. This valve is of the butterfly type, with an actuator which moves the butterfly to the open or closed position. Two microswitches signal the valve position to the AEVC 10HQ. A visual position indicator is located on the top of the actuator unit. The function of the valve is to discharge the excess ventilation air to the underfloor area.
 G. Skin Exchanger Isolation Valve (Ref. Fig. 010) The skin exchanger isolation valve 24HQ is installed upstream of the skin heat exchanger. This valve is identical to the skin exchanger inlet bypass valve 16HQ.
　
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