-
the microcontroller and memory section,
-
the motor drive section,
-
the valve position feedback section (RVT position),
-
the BITE circuits,
-
the data output section (RS422 transmitter),
-
the power supply module. The box communicates with the CPC 11HL respectively 12HL via the RS422 bus. A pressure switch is installed in each box. It operates independently from the automatic operation. It closes the outflow valve if the pressure in the fuselage is less than the atmospheric pressure at an altitude of 15000 ft. (4571.91 m).
(2)
Automatic Motors The automatic motors are of a DC brushless type with an electromechanical brake. They are used in the automatic operation mode.
(3)
Manual Motor The manual motor is a DC brush type. It is used in the manual operation mode.
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Outflow Valve Figure 013
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Actuator Geartrain - Schematic Figure 014
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(4)
Feedback Module The feedback module is a Rotary Variable Transformer (RVT). It sends position data to the cabin pressure controllers 11HL and 12HL through the outflow valve electronic boxes. A potentiometer sends position data to the manual backup circuit of the cabin pressure controller 11HL.
(5)
Outflow Valve Bodies The outflow valve body has two gates, one forward and one aft. The gates are installed in a rectangular frame. The forward gate opens outwards and is mechanically connected to the aft gate. The aft gate opens inwards and is mechanically connected to the gear box and the forward gate. At low valve angles the valve gates make a two-dimensional nozzle that directs the outflow of air and gives thrust recovery.
(6)
Gearbox The gearbox transmits the movement from the activated motor to the outflow valve flap. A mechanical stop limits the rotation of the drive shaft for the valve flap movement.
C. Outflow Valve
NOTE : This description is only applicable for Outflow Valve Part Number
____
20790-01AA.
(Ref. Fig. 014, 015)
The outflow valve 10HL is of motor driven type. The valve body assembly
is milled from aluminum alloy. The outflow valve has:
-
two outflow valve electronic boxes,
-
two automatic motors,
-a manual motor,
-an outflow valve body and,
-a gearbox and feedback assembly.
Only one motor is active at any one time. During this time the other
motors are locked.
(1) Outflow Valve Electronic Boxes The outflow-valve electronic boxes contain the electronic circuits which are devided into the following sections:
-
the data input section (RS422 receiver),
-
the microcontroller and memory section,
-
the motor drive section,
-
the valve position feedback section,
-
the BITE circuits,
-
the data output section (RS422 transmitter),
-
the power supply module.
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Outflow Valve Figure 015
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The box communicates with the CPC 11HL respectively 12HL via the RS422 bus. A pressure switch is installed in each box. It operates independently from the automatic operation. It closes the outflow valve if the pressure in the fuselage is less than the atmospheric pressure at an altitude of 15000 ft. (4571.91 m).
(2)
Automatic Motors The automatic motors are of a DC brushless type with an electro-mechanical brake. They are used in the automatic operation mode.
(3)
Manual Motor The manual motor is a DC brush type. It is used in the manual operation mode.
(4)
Outflow Valve Bodies The outflow valve body has two gates, one forward and one aft. The gates are installed in a rectangular frame. The forward gate opens outwards and is mechanically connected to the aft gate. The aft gate opens inwards and is mechanically connected to the gear box and the forward gate. At low valve angles the valve gates make a two-dimensional nozzle that directs the outflow of air and gives thrust recovery.
(5)
Gearbox and Feedback Assembly The gearbox transmits the movement from the activated motor to the outflow valve flap. A mechanical stop limits the rotation of the drive shaft for the valve flap movement. The feedback module is a triple potentiometer integrated with the gearbox. It sends data to the cabin pressure controllers 11HL and 12HL through the outflow valve electronic boxes. The data is used for:
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